南昆铁路八渡滑坡成因机理新认识  

A new discussion about genesis and failure mechanism of Badu landslides in Nanning-Kunming railway

作　　者：刘传正[1] 

机构地区：[1]中国地质环境监测院,北京100081

出　　处：《水文地质工程地质》2007年第5期1-5,共5页Hydrogeology & Engineering Geology

基　　金：国家科技支撑计划重大项目(2006BAK01A10)

摘　　要：在考察现场和认真研究已有资料基础上,提出八渡滑坡是在特殊地质构造背景下,反倾岩层发生倾倒、折断、多期次崩塌和切层滑动作用,并经后期多次分区分期滑动改造形成的古崩滑堆积体。八渡滑坡复活范围局限于铁路上方开挖卸荷和铁路下方堆载施压的两个坡段,而不是沿古崩滑体与基岩的分界面（老滑面）整体复活。在变形破坏机制上,路上新滑坡（Ⅱ）是前缘卸荷牵引式,路下新滑坡（Ⅳ-Ⅴ）是后缘加载推移式。古崩滑体部分复活的原因主要是由于地质认识失误,导致后续的工程设计、工程施工和维护利用过程中行为不当引起的,大气降雨起了耦合加剧作用。最后,文章对滑坡整治工程方案论证提出了一些原则性建议。Badu landslide is an ancient geological congeries from many times of rock-falls and landslides, in which it is product that rock layers in reverse happens topple, break off, avalanche and landslide in geological history on the basis of Badu anticline structure. The revitalization of landslides happens respectively in the excavating and heap loading areas above railway and down, rather than happen along old slip plane of Badu landslide at all. There are two kind of different deformation and failure mechanism, where new slip （ Ⅱ ） is to be pull type above railway, and new slip （Ⅳ-Ⅴ ） is to be push type down. Two new landslips were directly induced by a series of mistakes in working process, such as geological survey, engineering design and construction. The heavy rain resulted in an impulse to it by accident in monsoon of 1997. Finally, some principles or suggestions are put forward to control the landslide in this paper.

关 键 词：八渡 古崩滑体 变形破坏机制 牵引式 推移式 

分 类 号：P642.22[天文地球—工程地质学]