包盖法填筑炭质泥岩路堤在降雨条件下的稳定性分析  

Stability Analysis of Carbon Mudstone Embankment Filled with Cover Method under Rainfall Condition

作　　者：曾铃[1,2] 李光裕[2] 邱祥[3] 史振宁[3] ZENG Ling;LI Guangyu;QIU Xiang;SHI Zhenning(Key Laboratory of Road Structure and Material of Ministry of Transport,Changsha University of Science&Technology,Changsha,Hunan 410076,China;School of Civil Engineering&Architecture,Changsha University of Science&Technology,Changsha,Hunan 410076,China;School of Transportation Engineering,Changsha University of Science&Technology,Changsha,Hunan 410076,China)

机构地区：[1]长沙理工大学道路结构与材料交通行业重点实验室,湖南长沙410076 [2]长沙理工大学土木与建筑学院,湖南长沙410076 [3]长沙理工大学交通运输工程学院,湖南长沙410076

出　　处：《公路工程》2018年第2期64-71,共8页Highway Engineering

基　　金：国家自然科学基金(51508040;51508079;51678073;51678074);湖南省自然科学基金(2016JJ3010)

摘　　要：为了研究包盖法填筑炭质泥岩路堤在降雨条件下的稳定性,基于饱和-非饱和渗流数学模型与边坡稳定性计算理论,对不同降雨强度和饱和渗透系数影响下炭质泥岩路堤渗流特性及稳定性的变化规律进行了分析。得出如下结论:(1)降雨过程中,坡面附近土体体积含水率升高速度快,其升高幅度和高程、距坡面的距离成反比。降雨停止后,坡面附近土体体积含水率降低缓慢,其降低幅度和高程、距坡面距离成正比。(2)随着降雨时间的增加,降雨强度越大,路堤土体孔隙水压力升高越明显,包边土体中正孔隙水压力区域范围也越大。(3)在降雨过程中,路堤饱和渗透系数越大,路堤土体孔隙水压力升高幅度越小。包边土体中正孔隙水压力区域范围也越小。(4)降雨期间,路堤安全系数逐渐降低;降雨停止之后,路堤安全系数缓慢升高。路堤安全系数的大小和降雨强度、饱和渗透系数成反比。Base on the saturated-unsaturated seepage and slope stability calculation theory,the variation law of seepage and stability of mudstone embankment under different rainfall intensity and saturated permeability coefficient is analyzed to study the stability of the embankment filled with under the rainfall condition.The conclusions are as follows:①The volume water content increases rapidly near the slope surface and the increase amplitude is inversely proportional to the distance from the slope during the rainfall.After the rainfall stopped,the volume water content of soil near the slope surface decreased slowly and the decrease amplitude was proportional to the height and distance from the slope surface.②The pore water pressure increases obviously and the area of positive pore water pressure also increases with the increase of rainfall time and rainfall intensity.③The pore water pressure increases slightly and the area of positive pore water pressure in the soil is small with the increase of the saturated permeability coefficient of embankment④During the rainfall,the safety factor of embankment gradually decreased and the safety factor of embankment increased slowly after the rainfall stopped.The safety factor of embankment is inversely proportional to the rainfall intensity and saturation permeability coefficient.

关 键 词：包盖法 路堤安全系数 孔隙水压力 体积含水率 

分 类 号：U416.12[交通运输工程—道路与铁道工程]