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.
出处
《人民长江》
北大核心
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)
关键词
膨胀土边坡
滑坡成因
稳定分析
南水北调中线工程
expansive soil slope
landslide genesis
stability analysis
Middle Route Project of South - to - North Water Diversion
