基于局部强度阶梯折减法的边坡渐进破坏研究  

Research on Progressive Slope Failure based on Stepwise Reduction Method of Local Strength

作　　者：侯世伟[1] 马士贺 李宏男[1,2] 张皓 HOU Shiwei;MA Shihe;LI Hongnan;ZHANG Hao(School of Civil Engineering,Shenyang Janzhu University,Shenyang 110168,China;Ministry of Engineering,Dalian University of Technology.Dalian 116024,China)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168 [2]大连理工大学建设工程学部,辽宁大连116024

出　　处：《防灾减灾工程学报》2020年第1期72-78,共7页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家重点研发计划项目(2018YFD1100404);国家自然科学基金项目(51308355);辽宁省自然科学基金项目(20170540736)资助。

摘　　要：通过强度折减法获取边坡的潜在滑裂带是目前数值计算广泛使用的方法,研究边坡滑裂带形成的渐进过程及坡体内部土体的应力状态具有重要的理论意义和工程价值。基于边坡破坏的渐进性思想,针对均质边坡提出了一种局部强度阶梯折减的方法。该方法以屈服接近度(YAI)作为判别土体是否存在破损区的评价标准,将局部破损区按不同破损次序分配予不同的折减系数,利用通用软件ABAQUS对局部坡体进行强度折减计算,研究边坡渐进变形过程,直至边坡发生整体破坏。计算结果表明,坡体内部初始破损区参与了潜在滑裂面的形成过程,对边坡后期渐进变形具有贡献;有效解决了传统强度折减法潜在滑裂面上折减区和非折减区边界处的塑性应变值的跳跃性问题,合理地演化了边坡的渐进失稳进程。The strength reduction method is one of the widely used methods to obtain the potential slip zones of slopes in numerical calculation.It is of great significance to study the progressive process of slip surface and the stress state of the soil slope.Based on the idea of progressive failure,a method to step wisely reduce local soil strength for the homogeneous slope is proposed.At first,the yield approach index(YAI) is regarded as the evaluation index of the damaged area,and the local breakage areas were assigned to different reduction coefficients according to the damage order.Then,the local slope body was calculated in ABAQUvS and the slope progressive deformation was studied until the overall failure.The results show that the internal initial breakage area of the slope is involved in the formation process of the potential sliding surface and contributes to the progressive deformation of the slope in the later stage.The leaping problem of the plastic strain value at the boundary of the reduction area on the potential sliding surface was effectively solved,and the progressive failure process of the slope is reasonably reproduced.

关 键 词：局部强度阶梯折减 边坡 滑裂带 渐进破坏 数值模拟 

分 类 号：TU473[建筑科学—结构工程]