黄腊石滑坡基岩弯曲松弛带工程地质特性、形成机制及失稳预测  

ENGRINEERING GEOLOGICAL CHARACTERISITICS,FORMATION MECHANISM AND FORECAST OF DEFORMING PATTERN OF SLACK BEDROCK ZONE UNDER HUANGLASHI LANDSLIDE

作　　者：伏永朋[1] 潘伟[1] 赵欣[1] 

机构地区：[1]宜昌地质矿产研究所,宜昌443003

出　　处：《地质灾害与环境保护》2007年第2期61-64,共4页Journal of Geological Hazards and Environment Preservation

摘　　要：黄腊石滑坡是发育在三叠系中统巴东组砂泥岩夹灰岩构成的逆倾坡上的滑坡群,总方量约1 800×104m3。滑坡滑带下面存在着大致连续分布的基岩弯曲松弛带。对于该松弛带工程地质特性的认识,将影响防治工程方案的设计及实施。本文通过野外工作、以往工作资料和研究成果的收集整理及再认识,对该滑坡下伏松弛带工程地质特性、形成机制及失稳预测作了一定深度的探讨,认为基岩弯曲松弛带是发生在特定的岩层中,由构造、重力、侵蚀、岩溶、风化、降雨及上部滑坡等因素共同作用的产物,工程地质环境质量较差,受重力及其上滑体滑动等因素影响,后期改造明显。在斜坡长期受重力累积变形、三峡水库运行期江水位变化及库岸再造作用下,将形成牵引式滑动。防治工程应在削方、排水等基础上,重点考虑防止库岸再造和斜坡坡脚部位变形。Huanglashi landslide is a group of converse slops developing in the Badong group of Middle Tertiary sand--mud stone interbeded with limestone, and the total volume is about 1.8 million m^3. Under slide zone there is a crooked and slack zone. The author, from the field investigation, re-interpretation of the information and data, derived its engineering geological characteristics and formation mechanism and discussed on forecasting of stability losing. The deformation of the strata is developed in the special strata with the cooperation of structure, gravitation, weathering, karst, and rainfall. On the basis of lasting gravity, reservoir water level changed and reservoir bank reforging, the slope would take place traction--slippage, so the better preventing methods are cutting slope, water drainage, avoiding reservoir bank reforging and the deformation of the foot slope.

关 键 词：地质灾害 坠覆体 复合堆积体 滑坡 三峡库区 

分 类 号：P642.22[天文地球—工程地质学]