摘要：
Transverse gradient extrusion (TGE) processes with different die inclined angles of 15 degrees, 30 degrees, 45 degrees and 60 degrees were used to produce Mg-3Al-1Zn sheets, thereby tailoring texture and mechanical properties of Mg alloy sheets. Microstructure, deformation texture and final mechanical properties of the obtained sheets were detected and discussed. Furthermore, the rheological behavior of Mg alloys during extrusion was analyzed by finite element method. As the TGE die inclined angle changed, the flow velocity along the transverse direction (TD) and effective strain difference along extrusion direction (ED) were changed during extrusion, and therefore the microstructure and texture of extruded sheets are altered. With increase of TGE die inclined angles, fine grain size and uniform microstructure were obtained. The base poles of most grains for the extruded sheets gradually deviate from normal direction (ND) to ED at center region and inclined from ED to TD at 1/4 edge region. A large elongation of 33.9 % and a low yield stress of 125 MPa can be obtained in the TGE-45 sheet.
摘要：
To quantitatively evaluate the effect of RW irrigation on yield, WUE, and IWUE, and identify aqueous, edaphic, and management factors that favor improved yield, WUE, and IWUE compared to control practices, a meta-analysis was conducted. The results indicated that RW irrigation is beneficial for improving crop yields, WUE, and IWUE (16.8, 23.8, and 18.7%, respectively). However, its effectiveness is highly dependent on the aqueous, edaphic, and management factors of the studies evaluated. Greater responses were found in practices using RW with a pH < 7 or a nitrogen content <100 mg/L. The soils with a pH = 7, electrical conductivity between 2 and 4 dS/m, bulk density <1.35 g/cm(3), and/or initial nitrogen content between 200 and 2,000 mg/kg produced the highest effect size. Furthermore, using a surface drip irrigation system, with a nitrogen fertilizer rate <1,000 kg/ha and irrigation level at 100% crop evapotranspiration are effective ways to use RW. Our findings highlight the potential of RW irrigation to improve crop yield, WUE, and IWUE and identify the conditions under which these results can be achieved. These results can provide a better understanding of RW irrigation and guide the practice of RW utilization in the future.
作者机构：
[Zhou, Shuming; Yan, Donghuang] Changsha Univ Sci & Technol, Sch Civil Engn, Changsha 410114, Peoples R China.;[Zhou, Shuming] Hunan City Univ, Sch Civil Engn, Yiyang, Peoples R China.
通讯机构：
[Shuming Zhou] S;School of Civil Engineering, Hunan City University, Yiyang 413000, China<&wdkj&>School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China<&wdkj&>Author to whom correspondence should be addressed.
关键词：
bridge engineering;reinforced-concrete beam;cracking;bearing capacity;finite element method
摘要：
Cracking is one of the main diseases of small- and medium-span reinforced concrete (RC) bridges. It is a key problem to determine the change in mechanical properties of RC beams after cracking in bridge-performance evaluation. The present study performs static loading tests on seven simply supported T-beams with different crack damage conditions. The influences of crack location, crack depth and steel-bar diameter at a prefabricated crack on the stress, deflection and crack distribution pattern of pre-cracked test beams are investigated. The failure mode and mechanism of pre-cracked beams are revealed. Based on the experimental results, a finite element model of a pre-cracked beam is developed and validated. Following this, a theoretical prediction method is proposed to calculate the ultimate load of pre-cracked RC beams. The results indicate that the direct damage to mid-span section size can significantly affect the stiffness of the RC beam. The local damage of the tensile steel section has insignificant influence on the overall stiffness of the beam. The stiffness degradation of the pre-cracked beam at the quarter span is smaller than that of the pre-cracked beam at mid-span. The strain of the T-beam section in the pre-cracked test conformed to the assumption of the flat section. The experimental observations are in good agreement with the theoretical predictions, which can provide a theoretical basis for the performance evaluation of existing RC beams.
期刊：
Journal of Materials Science: Materials in Electronics,2023年34(36):1-7 ISSN：0957-4522
通讯作者：
Wang, HO;Tan, WS
作者机构：
[Lu, Gefei; Dong, Fuxiao; Ma, Qinghua; Wang, Haiou; Wang, HO; Zhao, Bojun; Huo, Dexuan] Hangzhou Dianzi Univ, Inst Mat Phys, Key Lab Novel Mat Sensor Zhejiang Prov, Hangzhou 310018, Peoples R China.;[Tan, Weishi] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices, Key Lab Hunan Prov, Yiyang 413002, Peoples R China.;[Tan, Weishi] Nanjing Univ Sci & Technol, Key Lab Soft Chem & Funct Mat, Minist Educ, Dept Appl Phys, Nanjing 210094, Peoples R China.
通讯机构：
[Wang, HO ; Tan, WS ] H;Hangzhou Dianzi Univ, Inst Mat Phys, Key Lab Novel Mat Sensor Zhejiang Prov, Hangzhou 310018, Peoples R China.;Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices, Key Lab Hunan Prov, Yiyang 413002, Peoples R China.;Nanjing Univ Sci & Technol, Key Lab Soft Chem & Funct Mat, Minist Educ, Dept Appl Phys, Nanjing 210094, Peoples R China.
摘要：
The structure, magnetic, transport and magnetoresistance properties of SrMnO3 sample have been investigated. The SrMnO3 sample has single-phase structure with hexagonal symmetry, which is obtained by the X-ray diffraction. The scanning electron microscope reveals the particles of the sample are evenly distributed. The composition of the SrMnO3 sample is detected using the energy dispersive spectrometer, indicating the element ratio of Sr:Mn:O = 19.25:20.35:60.40. The magnetic, electrical transport and the magnetoresistance effect are studied via the temperature dependences of the magnetization, the resistivity and the magnetoresistance. An antiferromagnetic phase transition near 300 K appears in the SrMnO3 sample, and no significant entropy change can be found in the antiferromagnetic sample. The sample shows the insulator state since the resistance increases gradually with the decrease of temperature. Therefore, SrMnO3 is an antiferromagnetic insulator material. Moreover, the resistivity reduces significantly with the applied magnetic field, indicating an existence of magnetoresistance. Remarkably, the room-temperature magnetoresistance of the antiferromagnetic insulator SrMnO3 reaches 16.68% under 60 kOe field. This work opens our understanding of magneto-transport and magnetic properties of the antiferromagnetic SrMnO3. The discovery of magnetoresistance near room temperature in the antiferromagnetic insulator (SrMnO3) is of great significance for the development of antiferromagnetic spintronics.
关键词：
fear of theft;location-based;correlation factors;Guangzhou
摘要：
While the fear of theft is common and is known to lead to lower satisfaction with life and subjective well-being, current literature regards the fear of theft as a stable psychological state and ignores discrepancies based on location and their influencing factors. To fill these gaps, we selected 74 typical communities and collected 1568 questionnaires throughout Guangzhou. The results show that: (1) the respondents demonstrated significant location-based differences in their fear of theft. Locations including a coach station, a railway station, a bus station, a subway station and a wholesale market had the highest associated levels of fear, whereas locations dedicated to leisure activities, especially those in high-end places, had a lower level of respondents' fear of theft. (2) Vulnerability model, victimization model, community security and built environment can be applied to the analysis of fear of theft around different places, but interpretations of fear do vary widely from place to place.
摘要：
China’s largest high-latitude permafrost distribution zone is in Northeast China. With the intensification of global warming and engineering construction, the carbon stored in permafrost will gradually thaw and be released in the form of methane gas. However, research on the changes in methane concentration and emission sources in this area is still unclear. In this paper, the AIRS (Atmospheric Infrared Sounder) data carried by the Aqua satellite were used to analyze the distribution and change trends in the overall methane concentration in the near-surface troposphere in Northeast China from 2003 to 2022. These data, combined with national meteorological and on-site monitoring data, were used to study the methane emission characteristics and sources in the permafrost area in Northeast China. The results show that the methane concentration in the near-surface troposphere of Northeast China is mainly concentrated in the permafrost area of the Da and Xiao Xing’an Mountains. From 2003 to 2022, the methane concentration in the near-surface troposphere of the permafrost area in Northeast China showed a rapid growth trend, with an average linear trend growth rate of 4.787 ppbv/a. In addition, the methane concentration in the near-surface troposphere of the permafrost area shows a significant bimodal seasonal variation pattern. The first peak appears in summer (June–August), with its maximum value appearing in August, and the second peak appears in winter (December–February), with its maximum value appearing in December. Combined with ground surface methane concentration monitoring, it was found that the maximum annual ground surface methane concentration in degraded permafrost areas occurred in spring, causing the maximum average growth rate in methane concentration, also in spring, in the near-surface troposphere of permafrost areas in Northeast China (with an average value of 6.05 ppbv/a). The growth rate of methane concentration in the southern permafrost degradation zone is higher than that in the northern permafrost stable zone. In addition, with the degradation of permafrost, the geological methane stored deep underground (methane hydrate, coal seam, etc., mainly derived from the accumulation of ancient microbial origin) in the frozen layer will become an important source of near-surface troposphere methane in the permafrost degradation area. Due to the influence of high-permeability channels after permafrost degradation, the release rate of methane gas in spring is faster than predicted, and the growth rate of methane concentration in the near-surface troposphere of permafrost areas can be increased by more than twice. These conclusions can provide a data supplement for the study of the carbon cycle in permafrost areas in Northeast China.
通讯机构：
[Yang, YM ] H;Hunan City Univ, Coll Civil Engn, 158 Yinbindong Rd, Yiyang 413049, Peoples R China.
关键词：
Prestressed concrete structures;Bonding behavior;Corrosion of steel strands;Pull -out experiment;Empirical formula
摘要：
Degradation of bonding behavior due to chloride-induced corrosion of steel strands is critical for serviceability of prestressed concrete structures. In this paper, total thirty-one central and eccentric pull-out specimens were tested to study the effects of strand corrosion, combined with stirrups or position of steel strand on global force-slip response, bond strength and failure pattern. Experimental results show that the bond strength of the eccentric pull-out specimen without corrosion or slight corrosion is greater than that of the centrally loading ones, and the opposite is true once the corrosion rate reaches 6%. Stirrups in bonding specimens can effectively restrain the transverse deformation of concrete, and significantly improve the bond strength between corroded strand and concrete. As the corrosion rate of steel strand increases, the bond-slip curves of specimens with stirrups tend to be similar to those without stirrups. Compared with the corroded deformed bar, the degradation of bond behavior caused by deformed bar corrosion is more serious than that of steel strand corrosion. By considering the combined effects of steel strand corrosion, stirrups and position of steel strand, an empirical model is proposed to predict the bond strength between corroded steel strand and concrete with reasonable accuracy.
作者机构：
[Wu, Yingying] Hunan Univ Sci & Technol, Sch Mat Sci & Engn, Xiangtan 411201, Peoples R China.;[Ou, Yun] Hunan Univ Sci & Technol, Hunan Prov Key Lab Hlth Maintenance Mech Equipment, Xiangtan 411201, Peoples R China.;[Peng, Jinlin] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key L, Yiyang 413002, Peoples R China.;[Lei, CH; Lei, Chihou] St Louis Univ, Dept Aerosp & Mech Engn, St Louis, MO 63103 USA.
通讯机构：
[Lei, CH ] S;[Ou, Y ] H;Hunan Univ Sci & Technol, Hunan Prov Key Lab Hlth Maintenance Mech Equipment, Xiangtan 411201, Peoples R China.;St Louis Univ, Dept Aerosp & Mech Engn, St Louis, MO 63103 USA.
关键词：
non-equiaxed misfit strain;K0.5Na0.5NbO3;the Landau-Devonshire theory;ferroelectric thin films
摘要：
Environmentally friendly lead-free K1-xNaxNbO3 (KNN) ceramics possess electromechanical properties comparable to lead-based ferroelectric materials but cannot meet the needs of device miniaturization, and the corresponding thin films lack theoretical and experimental studies. To this end, we developed the nonlinear phenomenological theory for ferroelectric materials to study the effects of non-equiaxed misfit strain on the phase structure, electromechanical properties, and electrical response of K0.5Na0.5NbO3 epitaxial films. We constructed in-plane misfit strain (u(1)-u(2)) phase diagrams. The results show that K0.5Na0.5NbO3 epitaxial film under non-equiaxed in-plane strain can exhibit abundant phase structures, including orthorhombic a(1)c, a(2)c, and a(1)a(2) phases, tetragonal a1, a(2), and c phases, and monoclinic r(12) phases. Moreover, in the vicinity of a(2)c-r(12), a1c-c, and a(1)a(2)-a(2) phase boundaries, K0.5Na0.5NbO3 epitaxial films exhibit excellent dielectric constant epsilon(11), while at a(2)c-r(12) and a(1)c-c phase boundaries, a significant piezoelectric coefficient d15 is observed. It was also found that high permittivity epsilon 33 and piezoelectric coefficients d33 exist near the a(2)c-a(2), a(1)a(2)-r(12), and a(1)c-a(1) phase boundaries due to the existence of polymorphic phase boundary (PPB) in the KNN system, which makes it easy to polarize near the phase boundaries, and the polarizability changes suddenly, leading to electromechanical enhancement. In addition, the results show that the K0.5Na0.5NbO3 thin films possess a large electrocaloric response at the phase boundary at the a(1)a(2)-r(12) and a(1)c-a(1) phase boundaries. The maximum adiabatic temperature change Delta T is about 3.62 K when the electric field change is 30 MV/m at room temperature, which is significantly enhanced compared with equiaxed strain. This study provides theoretical guidance for obtaining K1-xNaxNbO3 epitaxial thin films with excellent properties.
作者机构：
[Yu, Zongchao; Li, Wenying; Luo, Shuchen; Zhong, Yuan; Wen, Ming] State Grid Hunan Elect Power Co, Econ Res Inst, Hunan Key Lab Energy Internet Supply Demand & Oper, Changsha 410004, Peoples R China.;[Changqing, Chen; Changqing, C] Hunan City Univ, Key Lab Smart City Energy Sensing & Edge Comp Huna, Yiyang 413000, Peoples R China.
通讯机构：
[Changqing, C ] H;Hunan City Univ, Key Lab Smart City Energy Sensing & Edge Comp Huna, Yiyang 413000, Peoples R China.
摘要：
This study proposes a short-term load prediction method of a bidirectional long short-term memory network based on feature mining of the power consumption big data in combination with the attention mechanism (AT) of Bayesian optimization to address the problems that a considerable amount of feature factors exist and the feature relationship is obscured in the historical power consumption big data. The method comprehensively considers the global features of the power consumption data in space and the local features in time. First, the Cen-CK-means clustering method is used to cluster the electricity consumption data of users, and the statistical, combination, and time category characteristics are extracted according to the meteorological factors related to load over multiple time scales. Second, the Bayesian and bidirectional long and short memory networks are combined to extract the temporal and spatial characteristics of the load data itself. Meanwhile, the AT is introduced to automatically assign the corresponding weights to the hidden layer state of the bidirectional long and short memory. This task is carried out to distinguish the importance of the different time load series, which can effectively reduce the loss of historical information and highlight information about key historical time points. Finally, taking the first type of load as an example, compared with the SVP, RBPNN, BiLSTM, and BO-BiLSTM algorithms, the MAPE index is reduced by 1.05%, 1.75%, 0.52%, and 0.26%, respectively. RMSE decreased by 186.61, 154.93, 91.88, and 15.76 MW, respectively, while R2 increased by 0.04, 0.07, 0.03, and 0.03, respectively. In the one-week forecast time, MAPE index decreased by 1.97%, 2.44%, 1.21%, and 0.6%, respectively; RMSE decreased by 271.18, 305.7, 183.13, and 97.91 MW, respectively; and R2 increased by 0.12, 0.08, 0.04, and 0.03, respectively (c) 2023 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license(http://creativecommons.org/licenses/by/4.0/).
摘要：
One-dimensional (1D) ordered mesoporous carbon hybrid nanotubes loaded with bimetallic oxide hollow nanospheres are expected to be very attractive electrocatalysts. In this study, through high-temperature pyrolysis, we generated Mo2C@C PNTs with outstanding electrical conductivity, a significant surface area, and effective catalytic activity by wrapping ordered mesoporous polypyrroles on the surface of 1D MoO3 nanotubes using block polymers that self-assembled. FeMnO3 hollow porous nanospheres have a large specific surface area, many electroactive sites, and excellent molecular/charge diffusion properties, which can be compounded with 1D ordered mesoporous nitride-rich carbon to solve the problem of poor electrical conductivity of metal oxides and to prevent the accumulation of 1D nanotubes. The composite showed excellent electrocatalytic activity towards rutin due to the synergistic interaction between Mo2C@C PNTs and FeMnO3. In the best case, rutin has a limit of detection (LOD) as low as 0.35 x 10(-9) M and a wide linear range (3 x 10(-9) to 3.1 x 10(-6) M). The sensor displays a remarkable level of selective response to rutin in the presence of other co-interfering species. Furthermore, it has superb repeatability and reproducibility. The sensor has shown outstanding recovery (95.7-104.1 %) in the practical viability of detecting rutin in beverages. This work not only provides a new candidate for the accurate detection of rutin but also provides insight into the exploration of advanced sensing materials.
作者机构：
[Ren, Huiting] Hunan City Univ, Sch Art, Yiyang, Peoples R China.;[Hou, Xuemei] Sehan Univ, Dept Educ, Grad Sch, Yeongam, Jeollanam Do, South Korea.;[Jia, Zhichun] Second Ship Design Inst Wuhan, Wuhan, Peoples R China.;[Mashhadi, Arsam] Univ Tehran, Tehran, Iran.;[Mashhadi, Arsam] Islamic Univ, Coll Tech Engn, Najaf, Iraq.
通讯机构：
[Huiting Ren; Huiting Ren Huiting Ren Huiting Ren] S;[Arsam Mashhadi; Arsam Mashhadi Arsam Mashhadi Arsam Mashhadi] U;School of Art, Hunan City University, Yiyang, China<&wdkj&>University of Tehran, Tehran, Iran<&wdkj&>College of Technical Engineering, The Islamic University, Najaf, Iraq
关键词：
electric machine analysis computing;electric power generation
摘要：
This study provides an optimal and efficient energy management strategy (EMS) for the cost-effective performance of a combined solar and green energy microgrid in both independent and grid-connected modes. A microgrid is formed by the system that includes a fuel cell (FC), a battery storage (BS), and a photovoltaic system (PV). Evidently, the unguaranteed features of the renewable energy and load electricity generate instability problems as well as economic ones, like operational expenses. To tackle these issues, a novel procedure is proposed that has been improved by a modified metaheuristic algorithm, called chaotic map-based chameleon Swarm Algorithm (CCSA). In this method, the simulation is based on a one-day planning perspective. The method aims to supply the power requirements of the load at the lowest possible cost under a constant DC bus voltage, protect the battery from overcharging and depletion, and improve the efficiency of the total system. To illustrate the suggested method's effectiveness, the simulation results of CCSA are compared with some studied methods in the literature, including GAMS, bald eagle search optimization algorithm (BEOA), original chameleon swarm algorithm (CSA), and grey wolf optimization algorithm (GWOA).
期刊：
Materials Chemistry and Physics,2023年310 ISSN：0254-0584
通讯作者：
Ma, Dechong;He, GW
作者机构：
[Ma, Dechong; Pan, Sai; Ma, DC; He, Guowen; Tan, Mingjun] Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Peoples R China.;[Zhao, Jingzhe] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Peoples R China.
通讯机构：
[Ma, DC; He, GW ] H;Hunan City Univ, Coll Mat & Chem Engn, Yiyang 413000, Peoples R China.
关键词：
Bi nanostructures;Controlling agent;Catalysis degradation;Morphology-controlled synthesis
摘要：
Bi with four different morphologies (zero-dimensional (0D) nanoparticles, one-dimensional (1D) nanowires, twodimensional (2D) nanoplates, and three-dimensional (3D) shuttle like structures) was successfully synthesized by changing the synthetic conditions. The Bi nanostructures were characterized in terms of structure, morphology, surface characteristics, optical properties and catalytic activity using X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FT-IR), Brunauer-Emmett-Teller (BET), photoluminescence (PL), UV-vis absorption spectroscopy (UV-Vis) and total organic carbon (TOC) analyzer techniques, respectively. The PL spectra is shown that the reduction of the size of Bi nanomaterials can reduce the recombination rate of photoelectrons and holes, which leads to the effective separation of photocharge carriers and the lowest photoelectron and hole recombination rates. The band gap values of Bi nanoparticles, nanowires, nanoplates and shuttle like structures are 2.71 eV, 2.76 eV, 2.92 eV and 3.22 eV respectively, favouring the harvesting of visible-light. The experimental results of the degradation performance of Bi with different morphologies exhibited that 99.9%, 97.9%, 96.2% and 74.4% degradations of the Rhodamine B (Rh B) was observed for Bi nanoparticles, nanowires, nanoplates and shuttle like structures, respectively. During the degradation of RhB, with the prolongation of treatment time to 90 min, the highest removal rates of chemical oxygen demand (COD) and TOC was 73.5% and 68.4%, respectively. According to TOC analysis, more than 68% of the carbon in the dyes will produce CO2 products. The removal efficiency is attributed to the production of center dot O2-, center dot OH and h+ and their mineralization to RhB. At the same time, the achieved results also reveal that Bi2O3 and BiOCl was found in Bi surfaces before and after catalytic degradation, which was confirmed by XPS and FTIR technology. In addition, Bi with the same morphology performed different catalytic activities in Rh B solution with different pH values. It was found that the degradation efficiency increased evidently when the pH value decreased. The mechanism of Bi photocatalytic activity was proposed based on the results of product analysis, radical capture and XPS analysis.
作者机构：
[Yin, Quan] Hunan City Univ, Hunan Engn Res Ctr Struct Safety & Disaster Preven, Yiyang 413000, Peoples R China.;[Yin, Quan; Fu, He-Lin] Cent South Univ, Sch Civil Engn, Changsha 410075, Peoples R China.
通讯机构：
[He-Lin Fu] S;School of Civil Engineering, Central South University, Changsha 410075, China<&wdkj&>Author to whom correspondence should be addressed.
关键词：
foundation pit;support system;deformation analysis;parameter influence
摘要：
The support system is the most important part of foundation pit engineering, which mainly determines the safety of foundation pit engineering. Based on the characteristics of the foundation pit of Changsha international financial center, the original pile-anchor-beam (PAB) support system is improved into a new form of support system, the pile-anchor-ribbed-beam (PARB) support system. This study establishes a numerical simulation model to calculate the surface settlement and the deformation of the retaining structure caused by the excavation of the foundation pit by using the PAB and PARB support systems, respectively. Finally, this study analyzes the influence of pile anchorage depth, ribbed beam size and waist beam size on the support effect. The field monitoring data are in good agreement with the numerical simulation results, which verifies the validity and accuracy of the numerical calculation model. The support effect of the new PARB support system is 30% higher than that of the original PAB support system. The position of maximum surface settlement is about 0.5 times the excavation depth from the retaining structure, and the position of maximum lateral deformation of the pile is about 0.9 times the excavation depth from the pile top. The increase in pile embedded depth and ribbed beam size can significantly improve the support effect, while the change of waist beam size does not improve the support effect significantly.
摘要：
Residential building space cooling and heating energy consumption account for approximately 15% of the total social energy consumption. Occupant behaviour is the primary factor influencing energy consumption for cooling and heating in residential buildings. This study used extensive face-to-face questionnaire surveys and actual measurements for typical households to study the cooling and heating energy consumption of high-rise residential buildings in Changsha. Statistical analysis was conducted on the influencing factors of participant information, architecture, occupant behaviour, and energy conservation awareness in the questionnaire survey. The household energy bills for cooling and heating were clustered, and PCA models were proposed between the influencing factors and the energy consumption, and were verified by measured data of typical households. The results demonstrated that the household energy bills could be divided into five categories. The PCA models show the mode of ventilation during the cooling period and the mode of air conditioner (AC) turning on/off during the heating period are the most important component, accounting for 46.7% and 35.9%, respectively. The statistical parameters provided a reference for the energy consumption simulation software, and the PCA models achieved energy consumption prediction through data of principal components, which are significant for building energy efficiency and carbon reduction.
期刊：
International Journal of Geomechanics,2023年23(12):04023229 ISSN：1532-3641
通讯作者：
Hu, D
作者机构：
[Liang, Xiaoqiang; Yang, Xian; Hu, Da; Li, Yongsuo; Hu, D] Hunan City Univ, Hunan Engn Res Ctr Struct Safety & Disaster Preven, 518 Yingbin East Rd, Yiyang 413000, Peoples R China.;[Hu, Da; Hu, D] Hunan Prov Key Lab Key Technol Hydropower Dev, 16 Xiangzhang East Rd, Changsha 410014, Peoples R China.;[Zhu, Yangkai] Cent South Univ, Key Lab Metallogen Predict Nonferrous Met & Geol E, 932 Lushan South Rd, Changsha 410083, Peoples R China.
通讯机构：
[Hu, D ] H;Hunan City Univ, Hunan Engn Res Ctr Struct Safety & Disaster Preven, 518 Yingbin East Rd, Yiyang 413000, Peoples R China.;Hunan Prov Key Lab Key Technol Hydropower Dev, 16 Xiangzhang East Rd, Changsha 410014, Peoples R China.
关键词：
Construction engineering;Construction management;Construction methods;Elastic analysis;Foundation settlement;Foundations;Geomechanics;Geotechnical engineering;Highway and road management;Highway transportation;Highways and roads;Infrastructure;Interchanges;Linings;Soil dynamics;Soil mechanics;Soil settlement;Structural analysis;Structural engineering;Structural settlement;Transportation engineering;Tunnels
摘要：
To accurately predict ground settlement caused by shield tunnel construction, a prediction method of ground settlement considering the support effect of the tunnel lining structure is studied in this research. First, based on the Maxwell-Betti power interchange theorem and considering the lining supporting effect of a circular shield tunnel, an analytical formula for ground loss caused by tunnel construction is derived by constructing two groups of elastic mechanical model calculation models for different stress states. The calculation method of ground loss with the influence of the lining support is optimized and improved. Second, considering the tunnel construction method and the lining support effect, the Loganathan formula is improved, a theoretical formula for a vertical displacement field for shield tunnel construction is deduced, and the ground settlement prediction model of a circular shield tunnel construction is established. Finally, the method is compared with other calculation methods, such as the Loganathan method, and three tunnel engineering cases are predicted and analyzed. The results show that the prediction results are closer to the actual monitoring settlement value, verifying that this method has good adaptability and reliability in actual tunnel engineering.
