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基于圆弧型滑面搜索的松散堆积体边坡坍岸宽度预测方程

期刊名称：水文地质工程地质，2009，Vol.36，No.2，47~51.
时间：0
分类：P642.22[天文地球—工程地质学;天文地球—地质矿产勘探;天文地球—地质学]
作者机构：[1]西南交通大学土木工程学院,成都610031, [2]成都理工大学地质灾害防治与地质灾害保护国家重点实验室,成都610059, [3]中国水电顾问集团成都勘测设计研究院地质工程分院,成都610072
相关基金：国家自然科学基金项目（40772175,40841025）;地质灾害防治与地质灾害保护国家重点实验室“科技减灾、重建家园”开放基金（DZKJ-08012）;西南交通大学科学研究基金（2008-A01）
相关项目：深部岩体和软弱结构面的变形及强度特性及其参数评估方法

关键词：水库坍岸, 松散堆积体, 圆弧型滑面, 预测方程, reservoir bank caving, loose accumulation, circular sliding surface, predictive equation

中文摘要：

西南某龙头水库自2006年底蓄水后，库区部分松散堆积体发生16处规模不等的坍滑变形，严重影响了坡体上居民的生命财产安全及环湖公路的正常运行。本文在现场地质调查、勘探及试验成果尤其是查明不同蓄水位下导致的坍岸边界基础上，对不同成因、不同粒度成分组成的堆积层边坡系统按圆弧型潜在滑面进行了坍岸预测分析，得出了不同土质类型、地形坡度以及不同蓄水位条件下的塌岸宽度。以此为基础，对坍岸宽度与土质类型（具体为内聚力C和内摩擦角φ）、地形坡度α、蓄水位与剪出口之间的高差△h以及坡体内地下水动水压力等表征指标进行了综合相关分析，初步得出了不同条件控制下以粗碎屑土为特点的松散堆积体坍岸宽度（B）的预测方程。

英文摘要：

Reservoir bank caving is complex geological environment problem, and it is a process of the slope substance changed from stability to destruction during the variation of the reservoir water level. Reservoir bank caving played a very important controlling role in the safety and the long operation, especially the regular operation of the highway and railway and the resettlements around the reservoir basin. Some loose deposits in reservoir area had induced 16 deformation of different scale because of the water filling of the principal reservoir of the Southwesten China in 2006, and they affected the residents safety on slope and normal running of the highway around lake seriously. Based on the on-site geological survey and exploration and experimental results, particularly the identification of the different bank collapse borders under different reservoir water levels, a bank collapse prediction of the loose accumulation slope with different shaping factors and granulometric composition was analyzed according to the method of the circular sliding surface search systematically, and finally the width of bank collapse under the control of different soil types, slope gradient and reservoir water levels was given. On the basis of the above studying results, a comprehensive correlation analysis was made, for example, the width of bank collapse and the soil type （especially the cohesion and internal frictional angle）, slope gradient, the height difference between the exit points on the slope face and the water level, and hydrodynamic pressure of groundwater, and the predictive equation was educed,concerning the width（ B ） of the loose deposits＇ s bank collapse marked by coarse -grained soil under different control factors.