作者： 周炎明;邓宗伟;刘文劼;高乾丰;范子坚

期刊： 中南大学学报(自然科学版),2024年55(01):346-354 ISSN：1672-7207

作者机构： [周炎明; 高乾丰; 范子坚] 长沙理工大学 土木工程学院,湖南 长沙,410114;[周炎明; 邓宗伟] 湖南城市学院 设计研究院有限公司,湖南 长沙,410008;[周炎明; 高乾丰; 范子坚] 长沙理工大学 桥梁工程安全控制技术与装备湖南省工程技术研究中心,湖南 长沙,410114;[邓宗伟] 湖南城市学院 土木工程学院,湖南 益阳,413049;湖南省交通科学研究院有限公司,湖南 长沙,410007

关键词： 风力机;模型试验;地基;应力分布;平面度;基础埋深

摘要： 为有效掌握风荷载作用下风力发电机地基的复杂应力分布,提出关于基底应力平面分布假定的修正方法.以相似法则为理论基础,建立山区风力发电机地基缩尺物理模型试验系统,模拟不同平均风速和脉动风时间步长时的水平风荷载,测试不同风荷载下的基底静压力和动压力,研究应力的分布模式、变化规律,提出基底应力的平面度修正方法.研究结果表明:风速越大,基底静压力越大;而当风速一定时,基底各点的压力差异随着时间步长增加而加大,因此,低频脉动风更容易威胁地基稳定性;在不同工况下,动压力仅为静压力的1/20～1/12,故可采用拟静力法对风力机基底应力进行计算;若按常用的建筑规范基底应力计算方法,会低估基底应力差异,结果偏于不安全,而进行平面度修正后,应力修正值与实测值更加接近,这证明了利用平面度修正的合理性,也意味着基础设计埋深可更大,这为山区风力机的地基基础安全设计提供了新思路.

语种： 中文

作者： Chao, Wan-li;Yang, Jin*;Liu, Wen-jie;Pan, Shi-qiang;Deng, Zong-wei;...

期刊： Advances in Civil Engineering,2022年2022:1-12 ISSN：1687-8086

通讯作者： Yang, Jin;Liu, WJ

作者机构： [Yang, Jin; Liu, Wen-jie; Pan, Shi-qiang; Jin, Yu-xuan; Yang, J; Liu, WJ; Chao, Wan-li] Hunan Commun Res Inst Co Ltd, Changsha 410007, Peoples R China.;[Fu, Gui-hai; Deng, Zong-wei] Hunan City Univ, Coll Civil Engn, Yiyang 413049, Peoples R China.

通讯机构： [Yang, J; Liu, WJ ] H;Hunan Commun Res Inst Co Ltd, Changsha 410007, Peoples R China.

摘要： With the popularized application of micropile for slope reinforcement, there are many kinds of pile section form, such as single steel bar, multisteel bar, and tube. In order to obtain the theoretical calculation model of horizontal capacity of micropiles with different types, numerical simulations for two common conditions, namely, soil-soil and soil-rock, were carried out to study micropile reinforced slope's deformation and failure regulation. The dominated indicator for micropile horizontal capacity was acquired. By using the equivalence principle, four kinds of micropiles' capacity calculation model were deduced. Then, FEM numerical analysis was used for validation. The results show that the flexural capacity of micropile is a critical and dominated indicator which should be considered seriously in slope reinforcement design. When the ultimate flexural capacity is reached, the displacement of micropile reinforced slope will increase rapidly. The primary factor affecting the flexural capacity of micropiles is pile diameter, followed by section reinforcement ratio. The calculation results of the calculation model of flexural capacity proposed in this paper are close to those of numerical ones and are safer. The calculation model can provide reference for micropile selecting and slope reinforcement design, especially for quick design of emergency engineering. © 2022 Wan-li Chao et al.

语种： 英文

作者： Deng, Zong-Wei;Fan, Zi-Jian;Zhou, Yan-Ming;Deng, Pei-Yu

期刊： Sustainability,2022年14(21):14213- ISSN：2071-1050

通讯作者： Zi-Jian Fan

作者机构： [Deng, Zong-Wei] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.;[Zhou, Yan-Ming; Deng, Pei-Yu; Fan, Zi-Jian] Changsha Univ Sci & Technol, Sch Civil Engn, Changsha 410114, Peoples R China.

通讯机构： [Zi-Jian Fan] S;School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China<&wdkj&>Author to whom correspondence should be addressed.

关键词： wind turbine;dynamic response;wind loading;spread footing

摘要： In order to study the dynamic response characteristics of circular extended foundation of wind turbine in mountainous areas, a 1:10 scaled model test was carried out on the circular extended foundation of 2MW wind turbine, and the deformation characteristics of wind turbine foundation under random wind load were analyzed by ABAQUS numerical calculation. The results show that: (1) The wind turbine foundation has different stress types on the windward side and the leeward side. The components of the windward side foundation are subjected to tensile stress, while the components of the wind turbine leeward side foundation are subjected to compressive stress. (2) The strain of the foundation bolt, the strain of the foundation ring, and the strain of the foundation plate are within the allowable range of material deformation, but the relative deformation of the windward side and the leeward side is quite different. (3) The numerical calculation results of wind turbine foundation under strong wind load are compared with the failure results of scale model experiment, which shows that the overall overturning failure of foundation is a dynamic response mode of wind turbine foundation. In the design and construction, it is necessary to strengthen the research on the windward side and the leeward side and strengthen the anti-overturning design of the wind turbine expansion foundation.

语种： 英文

作者： 邓宗伟;邓沛宇;高乾丰;郑清源;黎永索

期刊： 太阳能学报,2021年42(03):15-20 ISSN：0254-0096

作者机构： [邓宗伟; 郑清源; 黎永索] 湖南城市学院土木工程学院;[邓沛宇] 南华大学土木工程学院;[高乾丰] 湘潭大学土木工程学院

关键词： 风力机;数值模拟;应力;动力响应;随机风荷载

摘要： 为研究以坡积土为持力层的风电基础在风荷载作用下的倾覆破坏机理,以2 MW装机容量的圆形扩展基础为研究对象,基于ABAQUS有限元软件对该基础的室内1∶10缩尺模型的地基土应力和基础沉降进行计算研究。同时利用该基础的缩尺模型试验结果验证数值模型的可靠性。研究表明:随机风荷载引起的地基土应力的扩大效应和不均匀沉降的扩大效应,是导致风力机基础出现倾覆破坏的主要原因;当受强风荷载作用时,迎风侧基础边缘的土体首先进入塑性区,发生屈服破坏,导致上覆土体隆起,基础倾覆破坏就会随之发生。建议在进行风电基础设计计算时,对风力机基础中轴线上的相对沉降验算点处的沉降乘以合适的沉降扩大系数,以保证基础结构安全稳定。

语种： 中文

作者： Zhou, Yan-Ming;Deng, Zong-Wei;Fan, Zi-Jian;Liu, Wen-Jie

期刊： Advances in Civil Engineering,2021年2021:1-10 ISSN：1687-8086

通讯作者： Deng, Z.-W.

作者机构： [Fan, Zi-Jian] School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China;Hunan City University Design and Research Institute Co., Ltd., Changsha 410008, China;[Liu, Wen-Jie] Hunan Communications Research Institute Co., Ltd., Changsha 410007, China;College of Civil Engineering, Hunan City University, Yiyang 413049, China;[Zhou, Yan-Ming] School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China<&wdkj&>Hunan City University Design and Research Institute Co., Ltd., Changsha 410008, China

通讯机构： [Deng, Z.-W.] H;Hunan City University Design and Research Institute Co., China

摘要： The soil beneath a wind turbine withstands not only environmental impacts but also continuous vibrations transmitted from the superstructure. This paper presents an experimental study of the deterioration characteristics of shear strengths of residual soils affected by drying-wetting cycles and continuous vibrations. A series of triaxial tests were performed on compacted residual soil specimens after various drying-wetting cycles and vibrations. The influences of drying-wetting cycles and vibrations on the shear strengths of residual soils with different compaction degrees were analyzed. The results demonstrate that the shear strength and cohesion of compacted residual soils decreased as the number of drying-wetting cycles increased, and they tended to be stable after three drying-wetting cycles. The angle of internal friction decreased linearly with the reduction of compaction degree but was generally not affected by drying-wetting cycles. The shear strength of compacted residual soils also decreased because of continuous vibrations. After 10000 vibrations, the strength was stabilized gradually. Both the cohesion and angle of internal friction showed dynamic attenuation phenomenon. Finally, a modified Mohr-Coulomb strength equation considering the effects of drying-wetting cycles and vibrations was established. This equation could be used to predict the shear strength of compacted residual soils and further estimate the embedded depth of wind turbine foundations. © 2021 Yan-Ming Zhou et al.

语种： 英文

作者： Zhou, Yanming;Liu, Xinxi;Deng, Zongwei;Gao, Qian-Feng

期刊： Advances in Materials Science and Engineering,2021年2021:1-14 ISSN：1687-8434

通讯作者： Deng, Zongwei(dengzongwei@hncu.edu.cn)

作者机构： [Zhou, Yanming; Liu, Xinxi] Changsha Univ Sci & Technol, Sch Civil Engn, Changsha 410114, Peoples R China.;[Deng, Zongwei] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.;[Gao, Qian-Feng] Changsha Univ Sci & Technol, Sch Traff & Transportat Engn, Changsha 410114, Peoples R China.

通讯机构： [Deng, Z.] C;College of Civil Engineering, China

摘要： The objective of this study is to examine the performance of the shallow reinforced concrete foundation of a large-scale wind turbine under the influence of environmental loads. A 2 MW horizontal-axis onshore wind turbine supported by a shallow concrete foundation was considered. The foundation stresses, foundation settlements, and static and dynamic contact pressures at various positions of the shallow foundation were monitored from the construction phase to the operation phase in the field. Numerical simulations were also performed to further analyze the behavior of the wind turbine foundation in different cases. The results demonstrate that the responses of the reinforced concrete foundation, i.e., foundation stresses, contact pressures, and foundation settlements, were variables closely related to the wind direction and wind speed. The distribution of foundation stresses suggested that a reasonable design of steel reinforcement cages around the foundation steel ring is important. The dynamic contact pressure of the foundation could reach 5 kPa, so the influence of dynamic wind loads on the foundation response could not be always neglected, particularly for the foundations seated on weak soils. The foundation settlement during the operation phase could be characterized by the logistic model, but its distribution was uneven due to the presence of eccentric upper weight and wind load. The findings would provide guidance for the foundation design of onshore wind turbines in hilly areas. © 2021 Yanming Zhou et al.

语种： 英文

作者： 彭成;邓沛宇;范子坚;邓宗伟

期刊： 铁道科学与工程学报,2021年18(02):375-382 ISSN：1672-7029

作者机构： [邓沛宇; 彭成; 范子坚] 南华大学土木工程学院;[邓宗伟] 湖南城市学院土木工程学院

关键词： 碎石土;含石率;抗剪强度;黏聚力;内摩擦角;应力应变

摘要： 为探究含石率对石英砂岩类碎石土力学特性的影响,以湖南益阳某滑坡石英砂岩类碎石土为研究对象,对24组碎石土试样在不同围压(100,200和300 kPa)下进行三轴力学试验。研究结果表明:10%~30%含石率碎石土的应力应变曲线与正常固结土的应力应变曲线不同,在较高围压下出现了应变软化现象。这表明碎石的加入,会改变原有正常固结土的受力特性。该类碎石土的黏聚力随含石率的增加基本呈下降趋势,但摩擦角的大小则随含石率的变化存在一定的波动,相对来说,中等含石率范围内的摩擦角相对最大。低围压下(100 kPa),该类碎石土抗剪强度随含石率的升高而降低,中高围压下(200 kPa和300 kPa),其抗剪强度随含石率的变化总体呈降低趋势,但含石率为30%与50%时出现了峰值抗剪强度,表明该类碎石土的强度与稳定性同含石量的多少有关,在分析该类地层对工程的影响时应结合具体工程目的而做出相应的决定。

语种： 中文

作者： 凌宇军;邓宗伟;范子坚;胡赞涛

期刊： 湖南城市学院学报(自然科学版),2020年29(3):11-15 ISSN：1672-7304

作者机构： 湖南城市学院土木工程学院,湖南 益阳 413000;湖南城市学院规划建筑设计研究院湖南省城乡生态规划与修复工程技术研究中心/湖南省博士后流动站协作研发中心,湖南 益阳 413000;南华大学土木工程学院,湖南 衡阳 421000;[凌宇军; 邓宗伟; 胡赞涛] 湖南城市学院;[范子坚] 南华大学

关键词： BP神经网络;离散GM（1, 1）模型;拓宽路堤

摘要： 目前,对于拓宽路堤沉降趋势和稳定性的研究很少﹒为了探究拓宽路堤的沉降变化趋势和沉降规律预测,以益阳市梅林路K0+460～K0+600为基础,运用BP神经网络与离散GM（1, 1）模型对拓宽路堤进行沉降预测,并结合已有监测数据,对比分析2种方法的优劣﹒结果表明:离散GM（1, 1）模型能对已有数据进行拟合,输出预测值与实际监测结果相近;BP神经网络模型预测值相对离散GM（1, 1）模型更加接近实际监测结果,但需要对阈值与权重进行多次调试﹒2种方法沉降预测值均与实际监测值相近,均能有效预测拓宽路堤沉降﹒

语种： 中文

作者： 何山山;邓宗伟;邓沛宇;胡赞涛;戴文驰

期刊： 湖南城市学院学报(自然科学版),2019年28(04):11-14 ISSN：1672-7304

作者机构： 湖南城市学院 土木工程学院,湖南 益阳,413000;南华大学 土木工程学院,湖南 衡阳,421000;[邓沛宇] 南华大学;[戴文驰; 邓宗伟; 胡赞涛; 何山山] 湖南城市学院

关键词： 碎石土滑坡;降雨强度;现场监测;数值模拟

摘要： 为探究碎石粉质粘土滑坡的发育机理,以灰山港某碎石粉质粘土滑坡为研究对象,通过土工试验、现场监控和数值模拟相结合的方法,对不同降雨强度下滑坡的变形趋势进行了分析.研究结果表明:该滑坡土体颗粒缺失,降水入渗后容易导致细颗粒流失,土体在饱和情况下的抗剪强度远低于原位土体抗剪强度;当降雨达到暴雨强度时,坡脚孔隙水压力的迅速上升将会促使滑坡发生.

语种： 中文

作者： Deng, Zong-Wei*;Gao, Qian-Feng;Dong, Hui;Li, Liu-Xi

期刊： INTERNATIONAL JOURNAL OF PHYSICAL MODELLING IN GEOTECHNICS,2019年19(5):247-260 ISSN：1346-213X

通讯作者： Deng, Zong-Wei

作者机构： [Deng, Zong-Wei; Li, Liu-Xi] Hunan City Univ, Coll Civil Engn, Yiyang, Peoples R China.;[Gao, Qian-Feng] Univ Lorraine, UMR CNRS 7239, Lab Etud Microstruct & Mecan Mat, Metz 03, France.;[Dong, Hui] Xiangtan Univ, Hunan Key Lab Geomech & Engn Safety, Xiangtan, Peoples R China.

通讯机构： [Deng, Zong-Wei] H;Hunan City Univ, Coll Civil Engn, Yiyang, Peoples R China.

关键词： Aerodynamic loads;Dynamic response;Dynamics;Soils;Turbulent flow;Wind stress;Wind turbines;Contact pressures;Dynamic amplification;Dynamic amplification factors;Dynamic variables;Fluctuating wind;Onshore wind turbine;Shallow foundations;Wind loading;Foundations;aerodynamics;dynamic response;foundation;loading;loading test;model test;numerical model;wind forcing;wind turbine

摘要： Wind is a dynamic variable, which produces rocking movements on wind turbines, and thus resulting in dynamic responses of foundations and the subsoil. This study attempts to examine the dynamic responses of the shallow foundation of an onshore wind turbine subjected to wind loads. To this end, a series of model tests considering different wind load conditions was carried out on a 1/10-scale physical model. The static responses, the dynamic responses and the dynamic amplification effects of the shallow foundation were subsequently measured and analysed. The results demonstrate that the dynamic responses of the wind turbine shallow foundation were visibly affected by both the mean wind load and the fluctuating wind load. At the rated wind speed, the maximum strain-based dynamic amplification factor (DAF) of the foundation baseplate reached as high as 1·65, the maximum deformation-based DAF of the foundation top was 1·14 and the maximum contact-pressure-based DAF on the downwind side was 1·14. In addition, the reliability of the physical model was discussed and the results were verified by comparison with the numerical data in the literature. © 2018 ICE Publishing: All rights reserved.

语种： 英文

作者： Mo, Yizheng*;Xiao, Rencheng;Deng, Zongwei

作者机构： [Xiao, Rencheng; Mo, Yizheng] Nanhua Univ, Sch Civil Engn, Hengyang 421000, Peoples R China.;[Mo, Yizheng; Deng, Zongwei] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.

会议名称： 6th International Conference on Computer-Aided Design, Manufacturing, Modeling and Simulation (CDMMS)

会议时间： APR 14-15, 2018

会议地点： Busan, SOUTH KOREA

会议主办单位： [Mo, Yizheng;Xiao, Rencheng] Nanhua Univ, Sch Civil Engn, Hengyang 421000, Peoples R China.^[Mo, Yizheng;Deng, Zongwei] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.

会议论文集名称： AIP Conference Proceedings

关键词： soil cave;underground water level falling;finite element;stability

摘要： With the underground water level falling, the reliable estimates of the stability and deformation characteristics of soil caves in karst region area are required for analysis used for engineering design. Aimed at this goal, combined with practical engineering and field geotechnical test, detail analysis on vertical maximum displacement of top, vertical maximum displacement of surface, maximum principal stress and maximum shear stress were conducted by finite element software, with an emphasis on two varying factors: the size and the depth of soil cave. The calculations on the soil cave show that, its stability of soil cave is affected by both the size and depth, and only when extending a certain limit, the collapse occurred along with the falling of underground water; Additionally, its maximum shear stress is in arch toes, and its deformation curve trend of maximum displacement is similar to the maximum shear stress, which further verified that the collapse of soil cave was mainly due to shear-failure. © 2018 Author(s).

语种： 英文

作者： 丁简;邓宗伟

期刊： 湖南城市学院学报(自然科学版),2017年26(3):6-11 ISSN：1672-7304

作者机构： 湖南城市学院 土木工程学院,湖南 益阳,413000;[邓宗伟; 丁简] 湖南城市学院

关键词： 高填土;基坑;环境影响;稳定性;监测

摘要： 为了分析高填土基坑降水开挖对周围环境的影响及基坑稳定性,笔者以实际工程为例,对该基坑的地下水位、深层水平位移、地表沉降值、锚索轴力和桩顶水平位移进行了监测.监测分析表明,在施工过程中,基坑周边地下水位的变化大且变化不均匀,部分已超过了预警值;随着开挖深度的增加,深层水平位移随深度的变化曲线由线性逐渐向"弓"形分布转变,最后深层水平位移最大值位于地表以下一定深度;在施工过程中地表沉降可分为急剧增长和平稳增长两个阶段,地表沉降主要发生在基坑开挖期;桩顶水平位移和锚索拉力均随开挖深度的增加而增大,当基坑开挖至设计标高时达到最大并趋于稳定,测试值均小于预警值,满足要求.

语种： 中文

作者： 刘新喜;邓宗伟;高乾丰

期刊： 湖南大学学报(自然科学版),2017年44(11):81-87 ISSN：1674-2974

通讯作者： Deng, Zongwei(teapotd@163.com)

作者机构： [刘新喜] School of Civil Engineering and Architecture, Changsha University of Science and Technology, Changsha, 410114, China;[高乾丰] College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan, 411105, China;[邓宗伟] School of Civil Engineering, Hunan City University, Yiyang, 413000, China

通讯机构： School of Civil Engineering, Hunan City University, Yiyang, China

关键词： 风力机塔架;时域分析;脉动风模拟;台风荷载;动力响应

摘要： 为探讨不同塔架形式风力机的抗台风性能,基于Abaqus有限元软件建立4种不同塔架形式的风力机一体化模型,用自回归(AR)法对脉动风时程进行模拟,分别进行了模态分析和台风时程分析.结果表明,风轮和机舱对风力机自振频率的影响较大;钢筋混凝土锥筒塔架的最大顺风向位移随台风风速的增加呈平缓线性增加趋势,而其他3种塔架的位移随风速的增加表现为非线性增加.钢管格构式塔架为轻型柔性结构,其风载响应最为显著,钢锥筒塔架次之,而钢筋混凝土塔架因具有较大的自重和刚度,其位移响应最小,抗风性能较好.

语种： 中文

作者： Gao, Qian-Feng;Dong, Hui*;Deng, Zong-Wei;Ma, Yi-Yue

期刊： Computers and Geotechnics,2017年88:9-17 ISSN：0266-352X

通讯作者： Dong, Hui

作者机构： [Gao, Qian-Feng] Univ Lorraine Ile Saulcy, Lab Etude Microstruct & Mecan Mat, UMR CNRS 7239, F-57045 Metz 01, France.;[Dong, Hui; Gao, Qian-Feng] Xiangtan Univ, Hunan Key Lab Geomechan & Engn, Xiangtan 411105, Peoples R China.;[Dong, Hui] Xiangtan Univ, Coll Civil Engn & Mech, Xiangtan 411105, Peoples R China.;[Deng, Zong-Wei] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.;[Ma, Yi-Yue] Tongji Univ, Dept Geotech Engn, Shanghai 200092, Peoples R China.

通讯机构： [Dong, Hui] X;Xiangtan Univ, Coll Civil Engn & Mech, Xiangtan 411105, Peoples R China.

关键词： Dynamic amplification factors;Dynamic responses;Random wind;Shallow foundation;Wind turbine

摘要： Wind loads are random variables, which induce significantly greater responses in structures than do static loads. We develop a finite-infinite element model of a 2 MW wind turbine using ABAQUS and then verify it with in situ data. The adopted dynamic constitutive model of the soil is based on the Davidenkov skeleton curve. The results demonstrate that the dynamic amplification factors (DAFs) strongly depend on wind speed and spatial position. Considerable values of the DAFs, ground acceleration, and ground velocity are observed, suggesting that the responses of the shallow foundation of a wind turbine are affected by dynamic wind loads. © 2017 Elsevier Ltd

语种： 英文

作者： 付贵海;魏丽敏;邓宗伟;蒋建清

期刊： 中南大学学报(自然科学版),2017年48(8):2195-2202 ISSN：1672-7207

通讯作者： Fu, Guihai(fugui6666@126.com)

作者机构： [付贵海; 魏丽敏] School of Civil Engineering, Central South University, Changsha;410075, China;[邓宗伟; 蒋建清] School of Civil Engineering, Hunan City University, Yiyang;413000, China;[付贵海] 410075, China <&wdkj&> School of Civil Engineering, Hunan City University, Yiyang

通讯机构： School of Civil Engineering, Central South University, Changsha, China

关键词： 高速铁路路基;桩筏复合结构;软土地基;现场试验

摘要： 结合杭甬高速铁路上虞北站深厚软土地基处理加固工程,开展典型路基断面桩筏复合结构长期工作特性的现场试验研究,测试获得筏板变形、地基沉降、桩顶反力、筏板钢筋应力及筏板下土压力随时间的变化规律。研究结果表明:桩筏复合结构可以满足深厚软基高铁无砟轨道工后沉降控制要求;筏板沉降沿路基横向呈现中心大、边缘小的分布形式,桩顶反力则沿筏板横向呈边缘大、中间小的马鞍形分布;铺轨6月后,筏板的累计工后沉降仅为0.48 mm,边缘处桩顶反力约为平均桩顶荷载的1.41倍、中心处桩顶反力约为平均桩顶荷载的0.75倍;筏板与其下的地基之间存在接触压力,且沿筏板横向呈抛物线型分布,大约承担30%上部荷载。

语种： 中文

作者： 高乾丰;董辉;邓宗伟;朱志祥;彭文春

期刊： 中南大学学报(自然科学版),2016年47(3):1011-1016 ISSN：1672-7207

通讯作者： Dong, Hui(aneurin.h.d@gmail.com)

作者机构： [高乾丰; 董辉] College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan;411105, China;[邓宗伟; 朱志祥] School of Civil Engineering, Hunan City University, Yiyang;413000, China;School of Civil Engineering, Central South University, Changsha

通讯机构： College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan, China

关键词： 多场耦合;风雨荷载;水平轴风力机;CFD模拟;离散相模型;有限元

摘要： 针对风雨共同作用下的风力机,提出风-雨-结构三场单向耦合分析方法。将风场和雨滴分别视为连续相和离散相,利用计算流体力学软件对风驱雨过程进行模拟,获得风力机表面的风压力和雨水撞击力。将风雨荷载网格节点力编辑成命令流文件导入有限元软件中进行分析,实现风雨场和结构之间的耦合,得到风雨共同作用下风力机的受力和变形特性。研究结果表明:在风速v10为7.565 m/s、降雨强度I为50 mm/h的天气条件下,雨荷载对风力机整体的受力和变形的影响较小。

语种： 中文

作者： 刘新喜;张平;邓宗伟

期刊： 中外公路,2016年36(6):14-16 ISSN：1671-2579

作者机构： 长沙理工大学土木与建筑学院,湖南长沙,410004;湖南城市学院土木工程学院;[刘新喜; 张平] 长沙理工大学;[邓宗伟] 湖南城市学院

关键词： 路堑边坡;软岩基座;强度折减法;变形;稳定性

摘要： 炭质泥岩软岩基座路堑边坡在开挖过程中的变形及稳定性变化规律研究旨在为该类型岩体结构的边坡支护设计与施工技术提供理论依据。运用FLAC3D软件，采用强度折减法对软岩基座路堑边坡开挖过程中的变形、塑性区分布、安全系数变化进行了分析。研究表明：边坡水平位移与竖直位移随开挖步数增加而增大，上部灰岩位移变化速率明显比其下伏炭质泥岩大，且竖直位移明显大于水平位移；边坡开挖过程中塑性区主要集中在灰岩与炭质泥岩的接触面；边坡安全系数随开挖步数增加而降低。因此，可以通过降低坡比、开挖步数来实现边坡开挖过程的稳定性。

语种： 中文

作者： 李波;吴立;邓宗伟;陈剑;唐爱松

期刊： 岩土力学,2015年36(2):532-540 ISSN：1000-7598

通讯作者： Wu, Li

作者机构： [李波; 陈剑; 吴立] Faculty of Engineering, China University of Geosciences, Wuhan, Hubei, China;[唐爱松] Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources, Yangtze River Scientific Research Institute, Wuhan, Hubei, China;[邓宗伟] College of Civil Engineering, Hunan City University, Yiyang, Hunan, China;[李波; 陈剑; 吴立] Engineering Research Center of Rock-Soil Drilling and Excavation and Protection, Ministry of Education, China University of Geosciences, Wuhan, Hubei, China

通讯机构： Faculty of Engineering, China University of Geosciences, Wuhan, Hubei, China

关键词： 高速铁路隧道;围岩抗力系数;径向液压枕法;理论计算模型;数值模拟

摘要： 以沪昆高速铁路隧道为依托,通过现场径向液压枕试验,测量各级压力下半径向变形,获取了隧道研究点处岩石抗力系数实测值。在实测数据的基础上,结合国内外相关的弹性抗力本构模型,建立了沪昆高速铁路隧道围岩抗力系数的5种理论计算模型:理想弹塑性模型、爆破裂缝弹塑性模型、塑性软化岩体模型、Lade-Duncan 准则模型、统一强度理论模型,并有针对性的将所研究的20座隧道进行分类,分别计算其围岩抗力系数理论计算值。为了弥补现场试验点数目的限制,对所研究的隧道展开了数值模拟分析。通过对不同的埋深、围岩级别、地质特征下岩石抗力系数现场试验值、理论计算值、数值模拟值和规范值进行对比和综合,提出了高速铁路大断面隧道的围岩抗力系数推荐值,该推荐值突破了普通铁路隧道规范中关于抗力系数建议值仅限于弹性模型的限制,为优化隧道结构设计,充分利用围岩的自承能力提供了理论依据。

语种： 中文

作者： 曾向军;邓宗伟;高乾丰;朱志祥;聂如松

期刊： 工业建筑,2015年45(3):109-114,108 ISSN：1000-8993

作者机构： [曾向军; 邓宗伟] 湖南城市学院土木工程学院;[高乾丰] 湘潭大学土木工程与力学学院;[朱志祥; 聂如松] 中南大学土木工程学院

关键词： 循环荷载;湖相软土;动力特性;动三轴试验;路基沉降

摘要： 以洞庭湖区沉积软土为对象进行循环振动三轴试验,研究不同动应力幅值、振动频率和围压下湖相软土的动力特性。结果表明:湖相软土轴向累积应变多呈稳定型增长,动应力幅值越大,累积应变越大,振动频率或围压越大,累积应变越小;动孔隙水压力随动应力幅值的增大而增大,受振动频率的影响较小,同时随围压的变化规律不统一,有待进一步研究;动应力幅值或振动频率越大,动弹性模量越小,围压越大,动弹性模量越大,且动弹性模量随振动次数的增加存在衰减现象,衰减规律亦受动应力幅值、振动频率和围压的影响。道路运营初期是软基沉降控制的关键阶段,为减小软基沉降,应特别重视对浅层软土的处理,并严格控制车载质量和车速。

语种： 中文

作者： 孔纲强;曹兆虎;周航;邓宗伟;郭尤林

期刊： 岩土力学,2015年36(5):1333-1338 ISSN：1000-7598

通讯作者： Deng, Zong-Wei

作者机构： [郭尤林; 邓宗伟; 孔纲强] School of Civil Engineering, Hunan City University, Yiyang, Hunan, China;[周航; 曹兆虎; 孔纲强] Key Laboratory of Geomechanics and Embankment Engineering, Ministry of Education, Hohai University, Nanjing, Jiangsu, China

通讯机构： School of Civil Engineering, Hunan City University, Yiyang, Hunan, China

关键词： 桩基;极限承载力;位移场;透明土;粒子图像测速技术;模型试验

摘要： 由于基桩纵向截面形式的差异,竖向荷载作用下桩侧摩阻力和桩端阻力发挥存在明显的差异,尽管纵向截面异形桩在工程中得到了一定的应用,然而针对极限荷载下桩端和桩侧土体破坏形式的研究却相对较少。基于透明土材料和粒子图像测速(particle image velocimetry)技术,针对等体积的扩底楔形桩、楔形桩和等截面桩的承载特性及破坏形式进行对比模型试验,测得桩顶荷载-沉降曲线,研究了各级荷载下桩端和桩侧土体位移场的变化规律以及极限荷载下桩端和桩侧土体的破坏形式;同时分析了不同桩长情况下各类型桩的承载力特性。研究结果表明,在此试验条件下,扩底楔形桩的极限承载力约为常规楔形桩的3.5倍和等截面桩的2.5倍;极限荷载作用下各类型纵向截面异形桩桩端的破坏形式规律基本一致。

语种： 中文