渗流和不良地质条件对江河岸坡稳定性的影响  

Influence of seepage and unfavorable geologic condition on stability of riverbank slope

作　　者：曹彭强[1] CAO Peng-qiang(Anhui&Huaihe River Institute of Hydraulic Research,Bengbu 233000,China)

机构地区：[1]安徽省·水利部淮河水利委员会水利科学研究院,安徽蚌埠233000

出　　处：《水运工程》2020年第4期104-108,共5页Port & Waterway Engineering

基　　金：安徽省·水利部淮委水利科学研究院青年科技创新基金项目(ky201801)。

摘　　要：针对渗流和不良地质条件对江河岸坡稳定性的影响,分析土的渗透系数随围压变化、土的饱和密度随围压变化、土的抗剪强度随含水率及浸泡时间变化的规律,构建渗流破坏的非稳定数值模型,探究岸坡裂缝、河水对岸坡的软化作用、降雨入渗对岸坡的安全系数的影响。结果表明:单个因素影响下,降雨入渗对岸坡的稳定性影响最大,安全系数可降低9.9%,其次是河水浸泡表层土的软化作用的影响(2.8%)和表层土裂缝的影响(1.9%);在3个因素的综合影响下,岸坡的安全系数降低10.4%~20.8%;土水耦合计算结果显示在3个因素的综合影响下,岸坡的安全系数降低11.3%~21.5%。In view of the influence of seepage and unfavorable geologic condition on the stability of riverbank slope,we analyze the variation law of soil permeability coefficient with confining pressure,saturation density with confining pressure,shear strength of soil with water content and immersion time,construct an unstable numerical model of seepage damage,and probe into the effects of bank cracks,river water softening on the bank slope and rainfall infiltration on safety factor of bank slope.The results show that under the influence of single factor,rainfall infiltration has the greatest influence on bank slope stability,and the safety factor can be reduced by 9.9%,followed by softening effect of river water(2.8%)and bank slope cracks(1.9%).The results of soil-water coupling calculation show that the safety factor of bank slope decreases by 11.3%~21.5%under the combined influence of three factors.

关 键 词：稳定系数 不良地质条件 降雨入渗 裂缝 

分 类 号：U656[交通运输工程—港口、海岸及近海工程]