干湿循环对水库滑坡渗透系数影响的试验研究  

Test study on effect of drying-wetting cycles on permeability coefficient of reservoir landslide

作　　者：张国栋[1,2,3] 邓全胜[1,2,3] 李泯蒂 徐志华[1,2,3] 李学良[1,2,3] 廖爱明[1,2,3] 卢书强[1,2,3] 

机构地区：[1]三峡大学三峡地区地质灾害与生态环境湖北省协同创新中心,湖北宜昌443002 [2]三峡大学湖北长江三峡滑坡国家野外科学观测研究站,湖北宜昌443002 [3]三峡大学湖北省地质灾害防治工程技术研究中心,湖北宜昌443002 [4]长江三峡通航管理局,湖北宜昌443113

出　　处：《人民长江》2016年第22期79-82,共4页Yangtze River

基　　金：湖北省科技支撑计划(2015BCE038);湖北省自然科学基金创新群体(2012FFA040);湖北省自然科学基金项目(2014CFB677)

摘　　要：水库滑坡受到库水位周期性干湿交替作用,这种干湿循环效应会对滑坡体渗透特性产生影响。在原大型渗透仪的基础上,制作了一种能够实现干湿循环效应的渗透系数测量试验装置,以原状碎石土为基础,配置不同含石量和孔隙比的重塑样,探索涉水滑坡渗透系数与干湿循环次数之间的关系,研究干湿循环对碎石土渗透系数的影响。试验研究结果表明:干湿循环作用对孔隙比较小的试样影响最为显著,渗透系数增加幅度最大。基于碎石土细观结构特性,初步分析了碎石土渗透系数变化的机理。研究成果可为滑坡稳定性分析中碎石土渗透系数的取值提供参考。The permeability of reservoir landslide is influenced by drying-wetting cycle induced by reservoir water level fluctuation. Based on the original large permeability meter,we developed the experimental apparatus capable of measuring the permeability coefficient under wetting-drying cycle. On the basis of undisturbed gravel soil,the remolded samples with different gravel content and porosity ratio were prepared to explore the relationship between the permeability coefficient of reservoir landslide and times of drying-wetting cycles,and the effect of drying-wetting cycle on gravel soil permeability coefficient was studied. The results show that the drying-wetting cycle has a remarkable impact on the samples of smaller porosity ratio and the permeability coefficient of these samples has the largest increment. According to the microstructure of gravel-soil,we carried out a preliminary analysis on the variation mechanism of gravel soil permeability coefficient. The research results can provide reference for determining the permeability coefficient of gravel soil in landslide stability analysis.

关 键 词：碎石土 干湿循环 渗透系数 渗透试验 水库滑坡 

分 类 号：P642[天文地球—工程地质学]