降雨条件下非饱和煤系土坡削坡后稳定性分析研究  

Stability Analysis of Unsaturated Coal Measure Soil Slope under Rainfall after Blasting Slope Cutting

作　　者：刘星星 鞠海燕[1] 万灵 伍伟斌 陶希 杨晨 LIU Xing-xing;JU Hai-yan;WAN Ling;WU Wei-bin;TAO Xi;YANG Chen(School of Civil and Architectural Engineering,Nanchang Institute of Engineering,Nanchang 330099,China;School of Architectural Engineering,Zhejiang University,Hangzhou 310058,China;Jiangxi Academy of Transportation Sciences,Nanchang 330200,China)

机构地区：[1]南昌工程学院土木与建筑工程学院,南昌市330099 [2]浙江大学建筑工程学院,杭州市310058 [3]江西省交通科学研究院,南昌市330200

出　　处：《公路》2022年第9期22-29,共8页Highway

基　　金：江西省交通运输厅科技项目,项目编号2020X013;江西省交通运输厅科技项目,项目编号2020Z003;江西省自然科学基金项目,项目编号20202BABL214041;江西省科技厅项目,项目编号20161BBG70054;江西省研究生创新专项基金项目,项目编号YC2021-S819;江西省教育厅科学技术研究项目,项目编号GJJ211907。

摘　　要：公路边坡因降雨入渗易产生滑坡,对公路安全造成极大的危害。以江西某高速公路煤系地层边坡为工程背景,研究爆破削坡施工后降雨条件下边坡的稳定性;采用有限元ABAQUS软件建立模型对削坡后的非饱和煤系土坡进行分析,探究不同降雨条件下削坡的位移、边坡稳定系数及孔隙水压力的变化规律。研究结果表明:爆破削坡比机械削坡的稳定系数小,位移及孔隙水压力的增值和增幅均更大;降雨条件下边坡位移存在一定的延滞性,边坡稳定系数在0~24 h内降幅最大,4种降雨类型对边坡影响顺序为前峰型>中峰型>均匀型>后峰型,且降雨初期边坡浅层土体率先达到饱和,极易造成浅层滑坡灾害。研究成果可为类似边坡工程提供参考与依据。The highway slope is prone to landslide due to rainfall infiltration,which causes great harm to the highway safety.The coal stratum slope of an expressway in Jiangxi Province is taken as background to study the stability of the slope under rainfall conditions after blasting slope cutting,the finite element ABAQUS software is used to establish a model to analyze the unsaturated coal soil slope after slope cutting,and the variation law of the displacement,slope stability coefficient and pore water pressure of the cut slope under different rainfall conditions are explored.The results show that the stability coefficient of blasting slope cutting is smaller than that of mechanical slope cutting,and the increment and increase of displacement and pore water pressure are greater;under the condition of rainfall,the slope displacement has a certain hysteresis,and the slope stability coefficient decreases the most in 0-24 h.The influence order of the four rainfall types on the slope is:front peak type > middle peak type > uniform type > rear peak type.In the initial stage of rainfall,the shallow soil of the slope first reaches saturation,which is very easy to cause shallow landslide disaster.This study can provide reference and basis for similar slope projects.

关 键 词：道路工程 降雨入渗 爆破削坡 非饱和煤系土坡 稳定性分析 

分 类 号：U416.1[交通运输工程—道路与铁道工程]