三峡库区水平层状滑坡成因研究

On Horizontally Bedded Landslide in the TGP Reservoir Area

三峡库区重庆市万州区和平广场滑坡群是近水平层状粘土岩、砂岩地区的典型代表 ,曾被列入库区四大滑坡之一 ,2 0 0 1年进行首批滑坡防治可行性研究 .文中从滑坡群在空间上的分布规律及与河流作用的关系、滑坡群中堆积物与河流冲积物的分布、剪切面 (带 )空间几何特点及矿化成分与微结构、形成时间及过程等四个方面 ,详细论述了滑坡群的主要特征及形成机制 ,进而提出了所谓的滑坡群实际上是“崩滑堆积为主、河流冲积与坡积为辅的混合成因堆积体”的新观点 ;进而为防治方案的优化提供了决策依据 。

Heping Plaza landslide group in Wanzhou, Chongqing of the TGP(three gorges project) reservoir area is a typical representation of closing horizontal mud terrain layer, which has been firstly studied on the feasibility for landslide prevention and cure in 2001 as one of four major landslides. The essay is accomplished on the basis of the feasibility study, and primary design and synthesis analysis on lots of reconnaissance information which is mastered before. It introduces the major character and forming mechanism of landslide group in four aspects: the relation between distribution law of landslide group in space, the distribution of landslide accumulation and river wash, the space geometry character and mineralization composition and microcosmic configuration of the cut face(belt), the time range and progress of landslide. A new view is advanced that landslide(s) group in fact is accumulation formed complexly, mainly by collapse accumulation, secondly by river wash and slope accumulation. It provides a base of prevention and cure which saves a lot of money for the nation.