折线型滑面边坡强度参数反演的极限分析上限法  

Back-analysis of shear strength parameters for slope with broken line sliding surface based on upper bound approach

作　　者：陈静瑜[1,2] 赵炼恒[1] 李亮[1] 谭捍华[3] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]华东交通大学轨道交通学院,江西南昌330000 [3]贵州省交通规划勘察设计研究院股份有限公司,贵州贵阳550001

出　　处：《中南大学学报（自然科学版）》2015年第2期638-644,共7页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51078359;51208522);中国博士后科学基金资助项目(20110491269;2012T50708);贵州省交通运输厅科技项目(2012122033);湖南省科学技术厅科技计划项目(2012SK3231)~~

摘　　要：基于极限分析上限定理,考虑孔隙水压力的影响,提出折线型滑面边坡稳定分析计算模型。根据相关联流动法则和内外能耗守恒原理,结合强度折减技术,对折线型滑面边坡稳定性进行分析,得出折线型滑面边坡稳定性极限分析上限解。假定滑坡处于极限平衡状态,即安全系数Fs=1.0,求解不同断面一系列的c和φ组合,然后用图解法确定边坡滑面的抗剪强度参数,不同断面的c-φ曲线的交点即为抗剪强度参数的反演值。以湘西朱雀洞特大滑坡为工程实例进行抗剪强度参数反演分析,并与现场勘测的强度参数进行比较分析。研究结果表明:本文方法有效,反演结果可为相似工程的强度参数确定提供有益参考。A new computational model for stability analysis of slope with the broken line sliding surface was presented based on the upper bound theorem with the influence of pore water pressure taken into consideration. In combination with the strength reduction technique, the stability of slope with broken line sliding surface was studied, and the upper bound solutions of safety factor for slope with the broken line sliding surface was obtained according to the associated flow rule and the internal and external energy conservation principle. Assuming that the landslide is in limit equilibrium state, namely the safety factor Fs=1.0, a series of c and φ combinations of different sections can be back calculated. And then the graphical method was used to determine the shear strength parameters, i.e. the intersection point of c-φ curves for different sections. In order to evaluate the validity of the proposed method, the Zhuquedong landslide as an engineering project was calculated, and then compared with the field survey values. The results show that the inversion parameters of both methods are in good conformity. The back-analysis results can give useful reference for the similar engineering.

关 键 词：参数反演 极限分析上限法 垂直分条 破坏机构 安全系数 

分 类 号：TU437[建筑科学—岩土工程]