降雨入渗条件下堆积型滑坡渗流侵蚀过程与稳定性数值模拟——以贵州省下街滑坡为例  

Study Numerical Simulation of Seepage Erosion Process and Stability of Accumulated Landslide under Rainfall Infiltration--Taking Xiajie Landslide in Guizhou Province as an Example

作　　者：杨义 江兴元[1,2] 李阳春 杨尉廷 YANG Yi;JIANG Xingyuan;LI Yangchun;YANG Weiting(College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China;Key Laboratory of Karst Geological Resources and Environment,Ministry of Education,Guizhou University,Guiyang 550025,China;Geological Environmental Monitoring Institute of Guizhou Province,Guiyang 550001,China)

机构地区：[1]贵州大学资源与环境工程学院,贵州贵阳550025 [2]贵州大学喀斯特地质资源与环境教育部重点实验室,贵州贵阳550025 [3]贵州省地质环境监测院,贵州贵阳550001

出　　处：《贵州大学学报(自然科学版)》2025年第1期26-33,共8页Journal of Guizhou University:Natural Sciences

基　　金：贵州省科技支撑计划资助项目(黔科合支撑[2023]一般119)。

摘　　要：降雨是贵州省堆积型滑坡失稳破坏的主要诱因。论文选取思南县下街滑坡为研究对象,通过地质环境调查详细分析该滑坡的形态特征、地层岩性、物质结构和变形特征,根据工程水文地质条件,建立数值计算模型,利用饱和-非饱和渗流有限元数值模拟方法模拟降雨条件下的斜坡渗流过程和颗粒迁移规律,分析降雨过程中的斜坡稳定性演化过程。研究结果表明:1)斜坡内土体含水率的演化历经浸润与地下水位抬升两个阶段;2)斜坡内土体孔隙水压力的演化随含水率具有一致性,且正孔隙水压力出现耗时与土体埋深成正比;3)斜坡土体细颗粒的迁移汇聚改变了土体组构,从而降低斜坡的稳定性;4)人类工程活动与地层岩性是斜坡发生失稳的先决条件,降雨为主要诱发因素。本文揭示了降雨条件下堆积型滑坡渗流、细颗粒迁移和变形破坏的水力耦合过程,可辅助堆积型滑坡失稳的监测预警设计。Rainfall is the main cause of instability and failure of accumulated landslides in Guizhou Province.The Xiajie landslide in Sinan County was selected as the research object,and the morphological characteristics,stratum lithologic,material structure and deformation characteristics of the landslide were analyzed in detail through geological environment investigation.According to the engineering hydrogeological conditions,a numerical calculation model was built,and the saturation-unsaturated seepage finite element numerical simulation method was used to simulate the seepage process and particle migration law on slopes under rainfall conditions.The evolution process of slope stability during rainfall wass analyzed.The result shows that:1)The evolution of soil moisture content in the slope has gone through two stages(i.e.infiltration and groundwater level uplift).2)The evolution of pore water pressure of slope soil is consistent with the water content,and the occurrence time of positive pore water pressure is proportional to the buried depth of soil.3)The migration and convergence of fine particles in the slope soil changed the soil fabric,thus reducing the stability of the slope.4)Human engineering activities and stratum lithologic are the prerequisites for slope instability,and rainfall is the main inducing factor.This study reveals the hydraulic coupling process of seepage,fine particle migration and deformation damage in accumulation-type landslides under rainfall conditions.All these facilitate warning design of accumulated landslide instability.

关 键 词：降雨斜坡 土体细颗粒迁移 稳定性演化 GeoStudio 

分 类 号：P642.22[天文地球—工程地质学]