缓倾外软硬互层型斜坡启滑前地下水压力分布特征物理模拟研究  

Study on Physical Simulation of Groundwater Pressure Distribution on Critical-sliding Landslide with Interbedded Soft and Hard Rock Beddings of Low Dip Angles

作　　者：岳建军[1] 林锋[1] 吉世祖 李俊[1] 

机构地区：[1]地质灾害防治与地质环境保护国家重点实验室(成都理工大学),成都610059

出　　处：《科学技术与工程》2015年第33期132-136,共5页Science Technology and Engineering

基　　金：973计划项目(2013CB733201)资助

摘　　要：强降雨是缓倾外软硬互层型滑坡发生的主要诱发条件,启滑前的地下水分布特征是此类滑坡形成的关键力学因素。弄清地下水分布特征对该类滑坡的稳定性评价和防治具有十分重要的意义。基于垮梁子滑坡为地质原型搭建试验模型,模拟强降雨条件下坡体内地下水分布特征及变形破坏模式。试验结果表明:1随着后缘裂隙水位上升,坡体内承压水呈三角形——前低后高梯形-矩形的演化规律;2伴随承压水分布的演化,坡体变形破坏呈现出前缘隆起-牵引后退式裂隙发育-滑移-拉裂趋势三个发展阶段;3降雨条件,含水层厚度及坡脚堵水条件等是影响坡体承压水分布的主要因素。Occurrence of landslide with interbedded soft and hard rock beddings of low dip angles was caused mainly by heavy rainfall. Groundwater distribution characteristics before sliding is a key intrinsic mechanical factor in explaining of formation of this kind of landslide under the condition of rainfall,and was significance to the evaluation and prevention and control of this kind of landslide based on geological model of Kualiangzi landslide,the test model was put up to simulate groundwater distribution and deformation and failure mode of slope body under heavy rainfall. The experimental results are as follows： 1 with the rise of fracture water level at rear edge of slope,confined water in slope body is characterized by the evolution characteristic of triangle-trapezoid which is low forwards and high backwards-rectangular; 2 deformation and failure of slope shows three development stages namely,front uplift,towing-retreating fracture development,and trend formation of sliding and fracturing; 3 the main effects on confined water distribution include rainfall,aquifer thickness and water plugging at the toe of slope.

关 键 词：缓倾外软硬互层型滑坡 物理模拟 承压水分布特征 变形破坏 影响因素 

分 类 号：P642.22[天文地球—工程地质学]