不同雨型条件下非饱和土边坡渗流及稳定分析  

Analysis of Seepage and Stability of Unsaturated Soil Slopes Under Different Rainfall Patterns

作　　者：杨国强 陶虎[1] 雷少伟 张梦梦 YANG Guo-qiang;TAO Hu;LEI Shao-wei;ZHANG Meng-meng(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《水电能源科学》2022年第6期166-170,共5页Water Resources and Power

基　　金：国家自然科学基金项目(51969011);甘肃省科技计划项目(20JR10RA274,21JR7RA301)。

摘　　要：为探讨不同降雨等级下不同雨型对非饱和土边坡渗流及稳定性的影响,基于降雨入渗渗流理论,运用Geostudio有限元软件研究非饱和土边坡在中雨、大雨、暴雨降雨等级下分别历经前峰型、均匀型、后峰型、阶梯型4种不同雨型的孔隙水压力及安全系数的变化规律。结果表明,在相同降雨等级下各雨型对孔隙水压力的变化速率呈现不同的变化规律,即前峰型呈上凸型,均匀型呈直线型,后峰型呈下凹型,阶梯型呈先凸后凹型,对安全系数的变化速率与之相反;降雨等级相同时,后峰型降雨对坡体孔隙水压力的上升幅度最大,同时对安全系数的下降幅度也最大,对坡体的稳定最不利;在相同降雨雨型、不同降雨等级下,降雨等级越高,坡体孔隙水压力越大,安全系数越小,对坡体的稳定越不利。In order to explore the impact of different rainfall levels and different rainfall types on the seepage and stability of unsaturated soil slopes, based on the theory of rainfall infiltration and seepage, the FEM software GeoStudio was used to study the variation rules of pore water pressure and safety factor of unsaturated soil slopes under four different rainfall types, namely, pre-peak, uniform, post-peak and step, under medium, heavy and storm rainfall levels respectively and the change of safety coefficient. The results show that under the same rainfall level, each rainfall type shows a different variation pattern on the change rate of pore water pressure: the front-peak type is up-convex, the uniform type is linear, the back-peak type is down-concave, and the step type is first convex and then concave, and the change rate on the safety coefficient is the opposite;When the rainfall levels are the same, the rise in pore water pressure of the slope body under the back-peak type rainfall is the greatest, i.e. the decrease of the safety coefficient is also the greatest, which is the most unfavourable to the stability of the slope body. Under the same rainfall type and different rainfall levels, the higher the rainfall level is, the higher the pore water pressure of the slope body is, the smaller the safety coefficient is, and it is more unfavourable to the stability of the slope body.

关 键 词：非饱和土 降雨雨型 孔隙水压力 安全系数 

分 类 号：TU457[建筑科学—岩土工程] TV139.14[建筑科学—土工工程]