降雨和库水联合作用下万州石龙门滑坡体渗流稳定性分析  

Seepage Characteristics and Stability Analysis of Wanzhou Shilongmen Landslide Under the Combined Effect of Rainfall and Reservoir Water

作　　者：李明 张恩铭 郑阳 张鹏[2] 黄皓 LI Ming;ZHANG En-Ming;ZHENG Yang;ZHANG Peng;HUANG Hao(Wuhan Center,China Geological Survey(Geosciences Innovation Center of Central South China),Wuhan 430205,Hubei,China;Institute of Geological Survey,China University of Geosciences(Wuhan),Wuhan 430074,Hubei,China)

机构地区：[1]中国地质调查局武汉地质调查中心(中南地质科技创新中心),湖北武汉430205 [2]中国地质大学(武汉)地质调查研究院,湖北武汉430074

出　　处：《华南地质》2025年第1期170-184,共15页South China Geology

基　　金：三峡后续工作地质灾害防治项目(0001212012A C50021)。

摘　　要：三峡库区库岸堆积层滑坡广泛发育,其稳定性主要受降雨和库水位变动联合作用影响。本文以重庆市万州区石龙门堆积层滑坡为例,建立精细地质模型,采用有限元方法对该滑坡开展了数值模拟研究,探讨其变形与稳定性的变化特征,总结在降雨和库水位联合作用下堆积层滑坡的渗流响应规律。结果表明:降雨和库水位下降是滑坡的关键诱因,降雨会提升滑坡中后部地下水位,当降雨强度超出土体入渗能力后,新增降雨多以坡面径流排泄,而库水位变动影响前缘地下水位及孔隙水压力。在库水位下降联合降雨作用下,滑坡内部应力-应变及稳定性显著恶化,渗流与水力梯度的增强加剧了滑坡不稳定性。本文研究可为堆积层滑坡的变形机制分析及监测预警提供参考。In the Three Gorges Reservoir area,piling layer landslides on the bank of the reservoir are widely developed,and their stability is mainly affected by the combined effect of rainfall and reservoir water level change.This paper takes Wanzhou Shilongmen piling layer landslide as an example,establishes a refined geological model,and carries out numerical simulation research on the landslide using the finite element method,to study the characteristics of the change of its deformation and stability,and to explore the seepage response law of the piling layer landslide under the combined effect of rainfall and reservoir level.The results show that:rainfall and reservoir level decline are the key triggers of landslides,rainfall will raise the groundwater level in the middle and back of landslides,and when the intensity of rainfall exceeds the infiltration capacity of the soil body,the additional rainfall is mostly discharged as slope runoff.The change of the reservoir level affects the groundwater level and pore water pressure at the leading edge.Under the combined effect of the reservoir water level drop and rainfall,the internal stress-strain and stability of the landslide deteriorate significantly,and the enhancement of seepage and hydraulic gradient aggravates the landslide instability.This paper provides a useful reference for analyzing the deformation mechanism and monitoring and early warning of landslides in the accumulation layer.

关 键 词：三峡库区 堆积层滑坡 有限元方法 稳定性分析 渗流特征 

分 类 号：P534.3[天文地球—古生物学与地层学]