裂隙膨胀土边坡模型降雨变形破坏过程数值分析  

Numerical Analysis of the Deformation and Failure of a Fissured Expansive Soil Slope Centrifuge Model During Rainfall

作　　者：杨文琦 周成[1,2] 王林[3] 谭昌明 YANG Wenqi;ZHOU Cheng;WANG Lin;TAN Changming(State Key Laboratory of Hydraulics and Mountain River Engineering of Sichuan University,Chengdu,Sichuan 610065,China;Key Laboratory of Failure Mechanism and Safety Control Techniques of Earth-rock Dam of the Ministry of Water Resources,Nanjing,Jiangsu 210024,China;Shanghai Pudong New Area Investment Consulting Company,Shanghai 200125,China;Sichuan Provincial Transport Department Highway Planning,Survey,Design and Research Institute,Chengdu,Sichuan 610041,China)

机构地区：[1]四川大学水电学院水力学与山区河流开发保护国家重点实验室,四川成都610065 [2]南京水利科学研究院水利部土石坝破坏机理与防控技术重点实验室,江苏南京210024 [3]上海浦东新区投资咨询公司,上海200125 [4]四川省交通运输厅公路规划勘察设计研究院,四川成都610041

出　　处：《水利与建筑工程学报》2018年第6期117-122,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金项目(51579167);水利部行业专项(201301022);水利部土石坝破坏机理与防控技术重点实验室开放基金项目(YK915003)

摘　　要：为研究多裂隙膨胀土边坡在降雨浸水作用下变形及滑动破坏特征,对裂隙膨胀土边坡在降雨浸水条件下滑坡的离心模型试验进行计算对比分析;并利用放大裂隙侧向水压力法近似模拟膨胀力的作用,分析探讨在不同降雨历时和降雨强度下,不同的膨胀土边坡裂隙的分布位置和深度、膨胀力的大小等对边坡的变形破坏过程及稳定安全系数变化的影响规律。结果表明:膨胀土边坡的破坏由坡脚开始,随着降雨历时的增加逐渐向坡顶发展,最终表现出坡脚膨胀隆起、坡顶塌陷的破坏特征。同时,膨胀力是分析膨胀土边坡稳定性问题不可忽略的因素,不考虑膨胀力时往往会高估膨胀土边坡的稳定性;膨胀土边坡的安全系数受降雨强度、降雨历时影响较大;坡中存在裂隙的膨胀土边坡比坡顶存在裂隙的膨胀土边坡更危险。In order to analyze the characteristics of deformation and sliding failure of expansive soil slopes under rainfall,the centrifugal model test of the fissured expansive soil slope under rainfall was compared and analyzed.The effect of the swelling force is simulated by amplifying the lateral water pressure of the magnified fissure.Based on this method,the change regulation of the safety factors is studied under different position and depth of the fissures,values of the expansion force,and rainfall duration and intensity.The results showed that the damage of the expansive soil slope started from the slope foot,and gradually developed upward with the increase of rainfall duration,eventually showing expansion at the foot of the slope and collapse at the top of the slope.At the same time,the expansive forces cannot be neglected in analysis of expansive soil slope stability,otherwise the stability of expansive soil slope will be overestimated.The safety factor of expansive soil slope is influenced by rainfall intensity and rainfall duration.And the expansive soil slope with fissure in the middle of slope is more dangerous than the expansive soil slope with fissure on the top.

关 键 词：裂隙 膨胀土边坡 离心模型试验 变形特征 滑动破坏 

分 类 号：TU43[建筑科学—岩土工程]