作者机构：
[邓宗伟; 蒋建清; 唐葭] College of Civil Engineering, Hunan City University, Yiyang, Hunan 413000, China;[高乾丰] School of Civil Engineering and Mechanics, Xiangtan University, Xiangtan, Hunan 411105, China
通讯机构：
[Deng, Z.] C;College of Civil Engineering, Hunan City University, Yiyang, Hunan, China
作者机构：
[蒋建清; 唐葭; 刘霁] School of Civil Engineering, Hunan City University, Yiyang 413000, China;[刘霁] School of Resources and Safety Engineering, Central South University, Changsha 410075, China
通讯机构：
School of Civil Engineering, Hunan City University, China
作者机构：
[邓宗伟; 蒋建清; 唐葭] School of Civil Engineering, Hunan City University, Yiyang 413000, China;[邓宗伟] School of Civil Engineering, Central South University, Changsha 410075, China
通讯机构：
School of Civil Engineering, Hunan City University, China
摘要：
Red-sandstone granular soil reinforced with gabion-mesh is a new concept of composite reinforced soil. In order to reveal the mechanical properties of this composite reinforced soil, a series of laboratory triaxial compression tests on specimens reinforced with gabion-mesh were carried out, and 3D discrete element method was introduced to simulate the triaxial tests. The macro stress-strain relation of red-sandstone specimens reinforced with gabion-mesh was reproduced by the 3D discrete element model. The results show that 3D discrete element method is an ideal technique to study the meso-mechanical nature characteristics of gabion-mesh reinforced red-sandstone granular soil.
期刊：
Proceedings of the 2nd International Conference on Transportation Engineering, ICTE 2009,2012年:844 - 849
通讯作者：
Jiang, J.(lh201314@163.com)
作者机构：
[Jiang, Jianqing; Yang, Guolin] School of Civil Engineering and Architecture, Central South University, Changsha, 410075, Hunan, China;[Jiang, Jianqing] School of Civil Engineering, Hunan City University, Yiyang, 413000, Hunan, China
会议名称：
Second International Conference on Transportation Engineering
会议时间：
July 25-27, 2009
会议地点：
Southwest Jiaotong University, Chengdu, China
会议论文集名称：
International Conference on Transportation Engineering 2009
摘要：
Red sandstone granular soil has been broadly applied to construct all kinds of embankment. In order to carry on the engineering application of red sandstone granular soil, the study on its strength parameters has been a very important task. Therefore, the computation formulas for horizontal push-shear tests of red sandstone granular soil were inferred based on three-dimensional limit equilibrium method. The strength parameters of red sandstone granular soil were calculated using the proposed formulas. The results show that its cohesion c and internal friction angle φincrease along with decrease of water content ratio of the specimen, and rise along with enhance of its compaction. The average value of the specimens' strength parameters calculated by three-dimensional technique is 21.56kPa and 29.29 degree, respectively, and the variance of the computational results by three-dimensional method is obviously less than that by traditional two-dimensional method. Copyright ASCE 2009.
作者机构：
[蒋建清; 李丽民] School of Civil Engineering, Hunan City University, Yiyang 413000, China;[杨果林; 蒋建清] School of Civil Engineering and Architecture, Central South University, Changsha 410075, China
通讯机构：
School of Civil Engineering, Hunan City University, China
作者机构：
[杨果林; 李昀; 蒋建清; 许桂林; 王亮亮] School of Civil Engineering and Architecture, Central South University, Changsha 410075, China;[蒋建清] School of Civil Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
School of Civil Engineering and Architecture, Central South University, China
作者机构：
[Jiang Jian-qing; Yang Guo-lin] Cent S Univ, Sch Civil & Architectural Engn, Changsha 410075, Hunan, Peoples R China.;[Jiang Jian-qing] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.
通讯机构：
[Jiang Jian-qing] C;Cent S Univ, Sch Civil & Architectural Engn, Changsha 410075, Hunan, Peoples R China.
关键词：
red-sandstone;large-scale field test;mechanical characteristic;strength parameter
摘要：
Large-scale field shear tests on ten specimens of the red-sandstone embankment at a highway in Hunan, China, were performed to examine mechanical characteristics and parameters of red-sandstone. The curves of thrust-displacement, failure mode, and shear strength parameters for red-sandstone with different water contents, different compactions, and different grain size distributions were obtained from the tests. A practical procedure of in-situ test for red-sandstone embankment was proposed to normalize the test equipment and test steps. Based on three-dimensional thrust-sliding limit equilibrium method, the formulas for calculating strength parameters of red-sandstone considering three-dimensional sliding surface were inferred. The results show that red-sandstone has typical complete curves of stress-strain, strain softening, which are caused by the special structure of red-sandstone; water content and compaction are important factors for strength and failure mode of red-sandstone; The average value of cohesion and internal friction angle of the specimens calculated by three-dimensional technique are 21.56 kPa and 29.29°, respectively, and those by traditional two-dimensional method are 25.52 kPa and 33.76°, respectively.
摘要：
According to the retaining wall that reinforced by extensible reinforcements such as geogrids and geotcxtiles, a new slice analysis methodology was developed to analyze its internal stability under horizontal and vertical seismic loads. The slide failure wedge of the reinforced retaning wall was divided into a number of soil slices parrallel to the reinforcements. Based on the single line shape assumption for the critical slip surface of the wall, the equilibrium equations for horizontal forces, vertical forces and moments of each soil slice were established. And then, the recurrence formulas for horizontal and vertical inter-slice forces, reinforcement tensile forces were derived consequently, in which the relationship between the inter-slice forces and the safety factor FS of the wall was included. The safety factor FS and the vertical bearing capacity qmat at the wall top were obtained by solving those recurrence formulas. This proposed slice method was applied to analyze the seismic stability of two reinforced retaining walls whose height was 5m and 10m respectively, and the results were compared with those of some conventional approaches such as strength reduction method and FLAC3D. The results show that: this method is simple, practical and good precision in calculation, so it can be used in actual seismic stability design of reinforced walls; the simplifed criteal slip surface is more feasible and convenient for engineering application than the log-spiral failure surface.
作者机构：
[蒋建清; 杨果林] School of Civil Engineering and Architecture, Central South University, Changsha 410075, China;[蒋建清] School of Civil Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
School of Civil Engineering and Architecture, Central South University, China
