西气东输管道工程子长地区黄土环剪试验研究  被引量:1

Ring-shear Test Research of Loess in Zichang Area along the West-to-East Gas Pipeline Project in China

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作  者:黄璇[1] 杨辉[2] 杨金[1] 

机构地区:[1]中国地质大学工程学院,武汉430074 [2]中南勘测设计研究院,长沙410014

出  处:《安全与环境工程》2011年第6期38-40,共3页Safety and Environmental Engineering

摘  要:黄土滑坡是构成西气东输管道安全的重大威胁。本文以西气东输管道工程子长地区的斜坡黄土作为研究对象,通过室内试验研究了该黄土在大剪切位移条件下的力学特征,结果表明:黄土试样在剪切过程中表现出应变软化的特征,并且较快达到残余强度;随着剪切带逐渐形成,黄土试样应力状态发生了改变,其变形也呈现出一定的特征,表现为试样轴向位移经历初始压密阶段、初始剪胀阶段、颗粒破碎压密阶段3个阶段。Loess landslides constitute a major threat to the safety of the West-East Gas Pipeline Project.Taking the slope loess of West-East Gas Pipeline in Zichang area as the research object,this paper studies the mechanical characteristics of loess by laboratory experiments under the conditions of a large shear displacement.The results show that:loess samples display the characteristics of strain softening in the shearing process,and can quickly reach the residual strength;with the gradual formation of shear bands,the sample stress state changes and its deformation also shows certain characteristics.The axial displacement of the sample undergoes three stages in the shear process: the initial compaction stage,the initial dilatancy stage and the contraction stage due to grain crushing.

关 键 词:西气东输 管道工程 黄土滑坡 环剪试验 子长地区 

分 类 号:X4[环境科学与工程—灾害防治] TU411[建筑科学—岩土工程]

 

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