万州近水平地层区堆积层滑坡成因与变形破坏特征

近水平地层区堆积层滑坡作为一类典型的滑坡,有其特殊的成因与变形破坏特征。文章在研究万州近水平地层区堆积层滑坡的基础上,详细分析了其物质来源、结构成因、形成模式以及变形破坏特征。通过总结万州堆积层滑坡的滑体和滑床特征,得出了近水平地区堆积层滑坡的物质来源和结构成因为:崩塌堆积为主,冲、洪积为辅;形成模式为:后部陡壁形成,滑床形成,滑体底部物质形成,滑体土石混合体形成,滑体表层物质形成,滑动解体等6个阶段。变形破坏特征为:滑动多沿堆积层和基岩接触面滑动,同时也会沿软弱夹层发生滑动;滑体存在多层剪切带,并在不同位置的剪切带其变形速率和累计变形量差别较大,滑体存在着差异变形,对此文章结合实例进行了分析。

FORMING CAUSES AND DEFORMATION-DESTRUCTION CHARACTERS OF ACCUMULATIVE STRATUM LANDSLIDE IN HORIZONTAL STRATUM IN WANZHOU

As a kind of representative landslide, accumulative stratum landslides in horizontal stratum have special forming causes and deforming-destructing characteristics. This paper studies the accumulative stratum landslide in Wanzhou and then analyzes the characteristics of the accumulative stratum landslide, sources of matter, causes, forming mode and deforming-destructing characteristics of the accumulative stratum landslide in horizontal stratum. The characteristics of landslide body and bed are then summarized. Falling accumulation is primary and diluvium and alluvium are subordinate to the accumulative stratum landslides in horizontal stratum. The forming mode have six steps: a) cliffy forming, b) landslide bed forming, c) bottom matter of landslide body forming, d) soil and stone forming and, e) the surface matter forming and disaggregating. The deforming-destructing characteristics are as follows: several shear zones can exist in the accumulative stratum landslides. At the same time, deforming velocity and accumulating deformation in different areas are various in the accumulative stratum landslides.