含软弱夹层土坡稳定性的三维弹塑性数值模拟  

Three-dimensional Stability Analysis of Slopes with Weak Interlayer Based on Elastoplastic Numerical Method

作　　者：袁伟[1,2] 黄茂松[1,2] 刘怡林[3,4] 王浩然[1,2] 

机构地区：[1]同济大学岩土与地下工程教育部重点实验室,上海200092 [2]同济大学地下建筑与工程系,上海200092 [3]交通运输部公路科学研究院,北京100088 [4]交通运输部道路结构与材料重点实验室,北京100088

出　　处：《郑州大学学报（工学版）》2012年第5期1-4,共4页Journal of Zhengzhou University（Engineering Science）

基　　金：国家"973"计划资助项目(2012CB719803);国家自然科学基金资助项目(51108215);西部交通建设科技项目(200831822357)

摘　　要：分析了软弱夹层的存在对三维边坡稳定性和破坏模式的影响.对一个经典的三维边坡算例进行了数值计算,并将结果与极限平衡法进行了对比,以验证强度折减弹塑性有限元法的可靠性.然后对一个含软弱夹层三维边坡进行了分析,计算结果表明:强度折减弹塑性有限元法计算的椭球破坏面在纵向长度上比极限平衡法要大;与三维均质边坡相比,三维软夹层边坡安全系数要低很多,破坏面的范围更大,塑性应变区的集中现象更加明显,破坏模式有着明显的不同.This paper analyzes the impact of the weak interlayer on the 3D slope stability and failure mode. Example of a classic 3D slope is calculated and the results were compared with the limit equilibrium method to verify the reliability of strength reduction elastoplastic finite element method. And then an example of a 3D slope with weak interlayer is analyzed, the results show that： the ellipsoid failure surface in the longitudinal length calculated by strength reduction elastoplastic finite element method is larger than the limit equilibrium method; compared with the 3D homogeneous slope, the factor safety of 3D slope with weak interlayer is much lower, the scope of failure surface is much larger, the phenomenon of the concentration of plastic strain zone is more obvious, and the failure mode has many significant differences.

关 键 词：三维夹层边坡 强度折减弹塑性有限元法 安全系数 

分 类 号：TU457[建筑科学—岩土工程]