台风暴雨条件下滑坡地下水渗流特征及成因机制

发布时间：2018-05-20 03:01

本文选题：台风暴雨 + 滑坡　；参考：《地球科学》2017年12期

【摘要】：台风暴雨常引发大量的滑坡灾害,造成生命财产损失,因而研究台风暴雨条件下滑坡地下水渗流特征及成因机制对滑坡的防治、预警预报具有重要意义.以浙江省中林村滑坡为例,采用有限元数值方法,模拟了台风暴雨的两种常见工况(工况1:等强度降雨;工况2:渐变强度降雨)下滑坡地下水的暂态渗流场及稳定性.结果表明:两种工况条件下,滑坡地下水渗流特征基本相同,地下水位响应迅速,地下水位位于强风化和中风化接触面附近,且在坡脚形成溢流;但是工况1较工况2地下水水位上升速度快、幅度大;滑坡稳定系数与地下水水位及降雨强度等密切相关,在高强度降雨条件下,随地下水水位上升稳定系数快速下降,水位稳定以后,稳定系数下降速度减缓;中林村滑坡为典型的滑塌-拉裂-蠕滑缓动型变形破坏模式,台风暴雨引起斜坡岩土体地下水水位上升,基质吸力降低和孔隙水压力增加是其发生变形破坏的主要原因.本文所得结论能够为东南沿海地区台风暴雨诱发滑坡的预测预报与防治提供理论支持.
[Abstract]:Typhoon rainstorm often causes a large number of landslide disasters, resulting in loss of life and property. Therefore, it is of great significance to study the characteristics of landslide groundwater seepage and its cause of formation mechanism for landslide prevention and early warning and prediction under the condition of typhoon rainstorm. Taking Zhonglincun landslide in Zhejiang Province as an example, the transient seepage field and stability of landslide groundwater are simulated under two common conditions of typhoon rainstorm (working condition 1: equal intensity rainfall; condition 2: gradual intensity rainfall) by using finite element method. The results show that the seepage characteristics of landslide groundwater are basically the same, the response of groundwater level is rapid, the groundwater level is near the interface of strong wind and middle weathering, and overflow is formed at the foot of slope. The stability coefficient of landslide is closely related to the groundwater level and rainfall intensity. Under the condition of high intensity rainfall, the coefficient of stability decreases rapidly with the rise of groundwater level. After the stabilization of water level, the decreasing speed of stability coefficient slowed down, the Zhonglincun landslide was a typical slough-tension-crevice type deformation and failure mode, and the groundwater level of slope rock and soil was raised by typhoon rainstorm. The decrease of matrix suction and the increase of pore water pressure are the main causes of deformation and failure. The conclusions obtained in this paper can provide theoretical support for the prediction, prediction and prevention of landslides induced by typhoon and rainstorm in southeast coastal areas.
【作者单位】：中国地质大学环境学院;南京地质调查中心;浙江省地质环境监测院;
【基金】：中国地质大调查项目(Nos.1212011140010,DD20160282)
【分类号】：P641.2;P642.22

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