膨胀土滑坡成因及其边坡稳定分析方法探讨  

Landslide genesis of expansive soil slope and slope stability analysis method

作　　者：张国强 宋斌 周述达 翁建良 阳云华 

机构地区：[1]长江勘测规划设计研究院枢纽设计处,湖北武汉430010 [2]长江岩土工程总公司(武汉),湖北武汉430010

出　　处：《人民长江》2014年第6期20-23,共4页Yangtze River

基　　金："十二五"国家科技支撑计划项目(2011BAB10B04)

摘　　要：南水北调总干渠所涉及的膨胀土渠段出现不同规模的滑坡损害,为此对滑坡形态与成因进行了调查分析。从槽样开挖揭示情况看,卸荷松驰、裂隙贯通、降水下渗软化、沿缓倾角蠕变等是滑坡形成的外因。而缓倾角裂隙密集带、沉积界面和岩性界面等因素构成滑坡的外因。采用刚体极限平衡方法和裂隙组合网格搜索方式,对滑坡实例进行了对比分析,表明所应用的边坡稳定分析模型是合理的。Various scaled landslide of expansive soil channel slope frequently occurred in the construction of Middle Route Pro-ject of South-to-North Water Diversion, so it is necessary to conduct investigation aiming at the landslide genesis and configu-ration. From the revelation of excavation, it is concluded that the external causes of slope landslide are excavation unloading, co-alescence of fissure, infiltration of rain, creep along gentle direction, and the internal causes are fissures concentration belt, dep-osition interfaces as well as lithology interfaces. The channel slope stability analysis is implemented using rigid limited equilibri-um method and grid search modes considering fissure combination, the calculation results show that the presented slope stability method is reasonable.

关 键 词：膨胀土边坡 滑坡成因 稳定分析 南水北调中线工程 

分 类 号：P642[天文地球—工程地质学]