银江水电站坝址区河床粉质黏土的工程地质特性及二期基坑边坡稳定性分析  

Engineering Geological Characteristics of Silty Clay in Riverbed and Stability Analysis of Second Stage Foundation Pit Slope in Dam Area of Yinjiang Hydropower Project

作　　者：刘培培 贺金明 朱信波 闻文 LIU Peipei;HE Jinming;ZHU Xinbo;WEN Wen(Yangtze Three Gorges Survey and Research Institute Co.,Ltd.,Wuhan Hubei 430074)

机构地区：[1]长江三峡勘测研究院有限公司(武汉),湖北武汉430074

出　　处：《四川水力发电》2025年第1期21-24,共4页Sichuan Hydropower

摘　　要：银江水电站坝址区河床覆盖层深厚,二期基坑开挖后围堰及基坑整体将形成高度达67 m的土质边坡,该土质边坡以粉质黏土为主,其透水性较弱,强度低。而边坡稳定问题直接关系到基坑内的电站厂房及大坝等主体建筑物的施工安全与进度,因此,分析与研究粉质黏土的工程地质特性对边坡开挖支护方案的确定、施工方案的研究以及施工过程中的预测预报具有重要意义。施工阶段对二期基坑的边坡稳定性进行了专题研究,为二期基坑的开挖方案设计及施工组织设计提供了有力的支撑。二期基坑边坡经过三个汛期的考验其运行安全,未发生失稳事故。结合钻孔揭露的实际地层情况和物理力学试验成果,对粉质黏土的分布、物理特性和力学特性进行了综合分析研究,旨在为其它类似工程的勘察设计与施工参考。The riverbed covering layer is deep in the dam site of Yinjiang Hydropower Project.After the excavation of the second stage foundation pit,the cofferdam and the foundation pit will form a soil slope with a height of 67m.The soil slope is dominated by silty clay with weak permeability and low strength.Therefore,the analysis of silty clay engineering geological characteristics is of great significance to the determination of slope excavation and support scheme,the study of construction scheme and the prediction of construction process.The stability of the second stage foundation pit slope is studied in the construction stage,which provides strong support for the excavation scheme design and construction organization design of the second stage foundation pit.The second stage foundation pit slope has been tested in three flood seasons,and it runs safely without instability accident.Based on the results of drilling and physical and mechanical tests,the distribution,physical and mechanical properties of silty clay are analyzed comprehensively,and the research situation is described,which can provide reference for other similar survey,design and construction.

关 键 词：粉质黏土 二期基坑 工程勘察 边坡稳定 银江水电站 

分 类 号：TV7[水利工程—水利水电工程] TV51TV52