作者机构：
[李志勇] School of Civil and Architectural Engineering, Central South University, Changsha 410075, China;[邓宗伟] School of Civil Engineering, Hunan City University, Yiyang 413000, China;[李志勇] Hunan Institute of Communications and Transport, Changsha 410007, China
通讯机构：
School of Civil and Architectural Engineering, Central South University, China
作者机构：
[刘自由; 江学良] School of Civil Engineering, Hunan University of City, Yiyang, Hunan 413000, China;[左文贵] School of Geoscience and Environment Engineering, Central South University, Changsha 410083, China
通讯机构：
School of Civil Engineering, Hunan University of City, China
作者机构：
[杨慧; 江学良] School of Civil Engineering and Mechanics, Central South University of Forestry and Technology, Changsha 410004, China;[曹平; 杨慧] School of Resources and Safety Engineering, Central South University, Changsha 410083, China;[江学良] School of Civil Engineeing, Hunan City University, Yiyang 413000, China
通讯机构：
School of Civil Engineering and Mechanics, Central South University of Forestry and Technology, China
期刊：
2010 International Conference on E-Product E-Service and E-Entertainment,2010年:1-5
作者机构：
[Hui Yang] School of Resource and Safety Engineering, Central South University, ChangSha, China;School of Civil Engineering and mechanics, Central South University of Forestry and Technology, ChangSha, China;School of Civil Engineeing, Hunan City University, Yiyang, China;[Xue-liang Jiang] School of Civil Engineering and mechanics, Central South University of Forestry and Technology, ChangSha, China<&wdkj&>School of Civil Engineeing, Hunan City University, Yiyang, China
摘要：
A vehical load is always regarded as a centralized harmonic load on beam model. To motorcade loads, when the beam's span is small and the spaces among vehicals of motorcade is also small, the motorcade load can be looked on as a full- distributed harmonic load on the roof. In this paper, the underground cavern's roof was looked on as Euler-Bernoulli's beam model and the motorcade load was regarded as the full distribution harmonic load. The catastrophe model of the roof was built and the necessary and sufficient condition of roof failure and the calculation formula of roof's safety thickness were built. Taken the cavern roof of Wengfu phosphate mine for example, the safety thickness of the roof was obtained. The analysis shows the roof's stability depends on the dead weight, engineering structure characteristics, attribute of rock mass except the vibration intensity and frequency. The roof fails more easily when the vibration amplitude is greater .The roof's thickness increases with the vibration frequency closed to nature frequency .The roof is more stable when the rock strength is bigger and more integral.
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.
作者机构：
[熊创贤; 邓运来; 万里; 张新明] School of Materials Science and Engineering, Central South University, Changsha 410083, China;[邓运来; 万里; 张新明] Key Laboratory of Nonferrous Materials Science and Engineering, Changsha 410012, China;[熊创贤] Department of Civil Engineering, Hunan City University, Yiyang 413000, China
通讯机构：
School of Materials Science and Engineering, Central South University, China
作者机构：
[江学良; 曹平; 杨慧] School of Resources and Safety Engineering, Central South University, Changsha 410083, China;[江学良] School of Civil Engineering, Hunan City University, Hunan Yiyang 413000, China
通讯机构：
School of Resources and Safety Engineering, Central South University, China
