摘要
位于五峰暴雨区中的新滩滑坡是长江三峡大型滑坡之一。强烈上升并有活动断层通过的峡谷斜坡构成滑坡形成的特殊地质环境。上硬下软的地层组合为山体崩塌提供了有利条件。滑坡区内的几条断层构成了新滩滑坡的部分边界。断层沟谷内堆积的巨厚崩积物构成滑坡体。滑带土是坡体上细粒土在降雨的淋滤作用下通过局部“涨落”而聚集的。滑带土在上部荷载作用下产生塑性流动,滑带土强度降低,导致滑坡起动。基岩谷底形态控制了新滩滑坡的滑动过程,而且由于姜家坡前缘的应力重分布,产生了新滩段滑体内的差异运动。
The Xintan landslide is one of the large scale landslides in the Three-Gorges. Active faults pass through the valley slope and nearby area. These form a special geological environment for the landslide. The structure of the rockmass, that soft layers are overlaid by the hard layers, is a positive factor for the rockfalls to occur. The faults in landslide area constitute parts of boundaries of the area. Under the eluviating action of the rain,the small clay grains,which deposited on the surface of weathering shale, gather up through partial 'fluctuation'. In the creeping process, the strength of clay of sliding zone decreased and the decrease of strength made the start-up of Xintan landslide. The un-sym-metric valley has controlled the sliding process of the landslide. The sudden releasing of stress of sliding mass at Shanyou' gulley made the stress redistributed. As a result, the east part of the area became an area of high stress, which decreases gradually to Gao's hill.
出处
《长江科学院院报》
CSCD
北大核心
1991年第3期28-34,共7页
Journal of Changjiang River Scientific Research Institute
关键词
滑坡
岩石
形成
rockmass structure
eluviation
strength decrease
valley form
stress redistribution
