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千将坪滑坡体位于三峡库区长江支流青干河的左岸,距三峡工程坝址44km。2003年7月13日零时20分,三峡库区秭归县千将坪村发生了山体基岩滑坡,造成15人死亡、9人失踪,4家乡镇企业被摧毁。文章通过对滑后详细地质调查,阐述了千将坪滑坡区地质条件,描述了滑坡发生的前兆现象以及滑坡发生滑动的过程,仔细分析了千将坪滑坡各要素的特征。根据滑坡体物质组成和结构的差异,把滑体物质自滑坡后缘至前缘分为块石堆积区、基岩裂解区、土夹块石区、漂砾卵石区。同时,文中研究了滑带土的物理力学性质,分析了滑坡体的成因机制,从地形地貌、岩性组合、构造条件详细论述了斜坡失稳的内因,认为导致斜坡失稳的外部因素有集中降雨、农田灌溉以及三峡蓄水3个方面的影响。
Qianjiangping landslide body is located on the left bank of Qinggan River, a tributary of the Yangtze River in the Three Gorges Reservoir Area, 44km away from the dam site of the Three Gorges Project. At 0:20 on July 13, 2003, mountain bedrock landslides occurred in Qianjungping Village, Zigui County, in the Three Gorges Reservoir area, killing 15 people and missing 9 people. Four township and village enterprises were destroyed. After detailed geological survey of slippery, the paper expounds the geological conditions of Qianqoping landslide area, describes the precursory phenomenon of landslide and the process of landslide slip, and carefully analyzes the characteristics of the various elements of Qianqiangping landslide. According to the difference of material composition and structure of landslide body, the material of the slide body is divided into block rock accumulation area, bedrock pyrolysis area, earth clamp rock area and boulder pebble area from the trailing edge of the landslide to the front edge. At the same time, the physical and mechanical properties of landslide soil are studied and the formation mechanism of landslide body is analyzed. The internal causes of slope instability are discussed in detail from topography, lithology combination and structural conditions. It is considered that the external factors leading to the instability of slope are concentrated Rainfall, farmland irrigation and impoundment of the Three Gorges.