多变降雨入渗下水库两岸高陡岩质边坡滑动岩体稳定性数值模拟  

Numerical simulation of sliding rock mass stability of high and steep rock slopes on both sides of reservoir under changeable rainfall infiltration

作　　者：韩昭玉 华桂钱 张华军 曹旖旎 HAN Zhaoyu;HUA Guiqian;ZHANG Huajun;CAO Yini(Jiangsu Province Engineering investigation and Research institute Co.,Ltd.,Yangzhou 225000,Jiangsu,China;Jiangsu the Taihu Lake Water Resources Planning Design and Research Institute Co.,Ltd.,Yangzhou 225000,Jiangsu,China)

机构地区：[1]江苏省工程勘测研究院有限责任公司,江苏扬州225000 [2]江苏省太湖水利规划设计研究院有限公司,江苏扬州225000

出　　处：《矿产与地质》2025年第2期371-376,共6页Mineral Resources and Geology

基　　金：江苏省水利厅科技项目(水利工程多源异构数据融合的3D建模关键技术研究N0.2022081)资助。

摘　　要：在水库蓄水环境下,库水位波动与降雨入渗的耦合作用对高陡岩质边坡的稳定性影响显著。采用GeoStudio SEEP/W模块对多变降雨入渗下水库两岸高陡岩质边坡滑动岩体稳定性进行数值模拟,研究不同降雨工况对边坡滑动岩体稳定性的影响情况。通过设定暴雨以及大暴雨两种降雨工况,对降雨时长以及降雨量进行调整,结合渗透系数函数曲线,模拟多变降雨入渗条件。在200 mm/s降雨强度下,1 d内,高程为40 m的降雨导致边坡浅层孔隙水压变化率最高,达到0.44;3 d的降雨条件下,监测点A的变化情况在第2 d后达到0.20;监测点C变化情况在第3 d时仍较高,为0.73。结果表明,在边坡的浅层和低高程区域,强降雨入渗条件会使土壤逐渐达到饱和状态,在该条件下,边坡滑动主要发生在较浅层的土体中,随着降雨时长的增加,稳定系数的下降速度逐渐减缓。By setting up two rainfall conditions,namely heavy rain and extremely heavy rain,the rainfall duration and rainfall amount were adjusted,and combined with the permeability coefficient function curve to simulate variable rainfall infiltration conditions.Under a rainfall intensity of 200 mm/s,within 1 day,the rainfall at an elevation of 40 m caused the highest pore water pressure change rate in the shallow part of the slope,reaching 0.44.Under the condition of 3-day rainfall,the change at monitoring point A reached 0.20 after the 2nd day;the change at monitoring point C remained relatively high at 0.73 on the 3rd day.The results indicate that under strong rainfall infiltration conditions,the soil in the shallow and low-elevation areas of the slope gradually reaches a saturated state.Under such conditions,slope sliding mainly occurs in the shallow soil layers.As the rainfall duration increases,the rate of decrease in the stability coefficient gradually slows down.

关 键 词：降雨入渗 水库边坡 滑动岩体 稳定性 数值模拟 

分 类 号：TU457[建筑科学—岩土工程]