摘要
边坡稳定性问题一直是工程地质方面比较突出的问题。在稳定性分析过程中,高填方边坡的不稳定变形是工程设计、治理的核心问题。降雨入渗不仅仅会造成岩土体抗剪强度直接降低,还会改变滑坡体中非饱和区渗流以及地下水水位线,致使不稳定边坡动、静水压力改变,使边坡稳定性朝不利方向发展。所以,当不稳定边坡与雨水入渗有着密切的关联。因此,分析降雨入渗情况下边坡饱和-非饱和渗流场,然后分析饱和-非饱和渗流影响下边坡稳定性发展,具有重要的意义。针对高填方边坡,研究了降雨对其稳定性的影响。对降雨入渗情况下西南地区某机场滑坡的渗流场特性进行了数值计算与理论分析,在此基础之上,用数值计算方法对滑坡体的稳定性进行了研究。主要利用了三维有限差分地下水流动数值模拟,并结合前期勘察资料来模拟不同降雨条件下的地下水位等值线分布状态,以及FLAC 3D数值模拟软件结合地下水位等值线,对不同降雨条件下高填方边坡变形情况进行研究分析,得到了不同降雨条件下的渗流场模拟情况以及相对应的变形影响。
Slope stability is a prominent issue in the field of engineering geology,wherein the instable deformation of high fill slopes is a core problem relating to engineering design and treatment in the stability analysis. The unstable slope is affected by rainfall and is closely related to rainfall infiltration. Because rainfall infiltration not only will cause the shear strength of rock and soil will directly reduce,the landslide in the unsaturated zone and groundwater seepage water line was changed,resulting in unstable slope dynamic and hydrostatic pressure change,the slope stability in negative direction. Therefore,it is of great significance to analyze the saturated unsaturated seepage field of slope under rainfall infiltration,and then analyze the development of slope stability under the influence of saturated unsaturated seep age. In view of the high embankment slope,in order to study the influence of rainfall on the stability of the rainfall infiltration in the saturated and unsaturated seep age theory,the rainfall infiltration seepage field characteristics of a airport in the southwest as an example landslide are carried out under the condition of numerical calculations and theoretical analysis,obtained in different rainfall conditions,the change law of seepage field. On this basis,numerical method is used to study the stability of the landslide.
出处
《科学技术与工程》
北大核心
2018年第3期174-183,共10页
Science Technology and Engineering
基金
国家重点基础研究发展计划(973计划)(2014CB047003)资助
关键词
高填方
降雨
地下水
变形
稳定
high fill rainfall groundwater deformation stability
