降雨-稳定渗流耦合作用下的边坡破坏机制分析  

Analysis of Slope Failure Mechanism Under the Coupling Effect of Rainfall and Stable Seepage

作　　者：王延林 赵治中 朱建华 WANG Yanlin;ZHAO Zhizhong;ZHU Jianhua(Anhui Port and Shipping Construction Investment Group Co.,Ltd.,Hefei 230091,China;Anhui Huaibei Port and Shipping Investment Co.,Ltd.,Huaibei 235000,China)

机构地区：[1]安徽省港航建设投资集团有限公司,安徽合肥230091 [2]安徽省淮北港航投资有限公司,安徽淮北235000

出　　处：《科技创新与生产力》2025年第4期55-58,共4页Sci-tech Innovation and Productivity

摘　　要：沱浍河水路航道两侧边坡广泛分布着细粉砂等砂性土地层,现将航道开挖边坡坡比由1:4调整至1:3,而降雨和地下水稳定渗流条件下砂土质边坡极易失稳破坏,本文采用数值模拟方法分析了降雨-稳定渗流砂土质边坡破坏机制分析。结果表明降雨与渗流的耦合作用会增加坡体内孔隙水压力,减少坡体的基质吸力,孔隙水压力在不同位置表现为坡面>坡中>坡内部。水位线附近是影响边坡的最大位移位置,最大渗透力随水位工况变化,渗流路径越短,动水压力和渗透力越大,渗透速度越快,稳定系数越小;相反,渗流路径越长,渗流速度越慢,稳定系数更大,越不容易发生破坏。较大的降雨强度会导致更小稳定系数,但在不同降雨工况下边坡的稳定系数降低幅度较小。Fine silt and other sandy soil layers are widely distributed on both sides of the Tuohui River waterway.The excavation slope ratio of the waterway has been adjusted from 1:4 to 1:3.However,under stable rainfall and groundwater seepage conditions,sandy soil slopes are prone to instability and failure.This paper uses numerical simulation methods to analyze the failure mechanism of rainfall stable seepage sandy soil slopes.The results indicate that the coupling effect of rainfall and seepage will increase the pore water pressure inside the slope,reduce the matric suction of the slope,and the pore water pressure shows the order of slope surface>middle slope>interior slope at different positions.Near the water level line is the maximum displacement position that affects the slope,and the maximum permeability varies with the water level conditions.The shorter the seepage path,the greater the dynamic water pressure and permeability,the faster the seepage velocity,and the smaller the stability coefficient;on the contrary,the longer the seepage path,the slower the seepage velocity,the greater the stability coefficient,and the less likely it is to cause damage.A higher rainfall intensity will result in a smaller stability coefficient,but the decrease in slope stability coefficient is relatively small under different rainfall conditions.

关 键 词：砂土边坡 降雨 渗流 数值模拟 

分 类 号：U213.13[交通运输工程—道路与铁道工程]