基于非饱和-饱和渗流的降雨入渗边坡稳定性分析  

Analysis of the Rainfall Infiltration on Slope Stability Based on Unsaturated-saturated Seepage

作　　者：董建军[1,2] 王思萌[1] 杨晓萧 聂兰磊 DONG Jianjun;WANG Simeng;YANG Xiaoxiao;NIE Lanlei(Department of Civil Engineering,Liaoning Technical University,Huludao,Liaoning 125105,China;Department of Engineering Mechanics,Dalian University of Technology,Dalian,Liaoning 116024,China;Baoding Urban Construction Planning and Engineering Design Institute,Baoding,Hebei 071000,China;Shandong Tong Yuan Design Group Co.Ltd.,Jinan,Shandong 250101,China)

机构地区：[1]辽宁工程技术大学土木工程系,辽宁葫芦岛125105 [2]大连理工大学工程力学系,辽宁大连116024 [3]保定市城建规划工程设计研究院,河北保定071000 [4]山东同圆设计集团有限公司,山东济南250101

出　　处：《水利与建筑工程学报》2018年第6期99-104,共6页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金资助项目(51479023);辽宁省自然科学基金资助项目(201602349)

摘　　要：对于雨水入渗导致的土质边坡稳定性问题,基于土质边坡非饱和-饱和渗流和DP5本构模型,引入非饱和土的基质吸力分量、抗剪强度方程和渗流方程,进行了非饱和-饱和渗流场与应力场耦合的边坡稳定性数值分析。结果表明:降雨入渗后,在土体历经由非饱和状态向饱和状态转变的过程中,土体的重度增加导致附加应力增加,饱和度增大致使基质吸力减小,渗流与应力的耦合作用增大了边坡的不稳定性;边坡滑移破坏开始在饱和的表层区域出现,滑移破坏从浅层渐近向深层发展;塑性破坏在坡脚部分最先出现,由坡脚逐渐向坡顶延伸,最后塑性区域贯通并扩大,造成边坡失稳。研究结果可为工程实践提供有效实用的依据和方法。In order to study the stability of soil slope after rainfall infiltration,the matric suction component,shear strength equation and seepage equation of unsaturated soil are introduced based on the unsaturated-saturated seepage and the DP5 constitutive model of soil slope,which are used in the numerical analysis of slope stability coupled with the unsaturated-saturated seepage field and the stress field.The results show that the soil changes from unsaturated state to saturated state after rainfall infiltration.The soil weight increases causes the additional stress to increase,and the increase of saturation causes the matric suction to decrease,which the coupling of seepage and stress increases the instability of the slope.The slip surface first appears in the shallow layer of the saturated slope surface,and the slip surface gradually evolves from the shallow layer slip to the deep layer slip damage.And the plastic failure occurs first in the foot of the slope which gradually extend from the foot to the top of slope.Finally,the plastic zone penetrates and expands to cause the slope to be unstable.The research results can provide effective and practical basis and method for engineering practice.

关 键 词：非饱和土 边坡 基质吸力 非饱和-饱和渗流 抗剪强度 

分 类 号：TU43[建筑科学—岩土工程]