基于变形加固理论的岩土边坡稳定和加固分析  

Stability and reinforcement analysis of rock and soil slope based on deformation reinforcement theory

作　　者：刘耀儒[1] 黄跃群[1] 杨强[1] 宋胜武[2] 冯学敏[2] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]中国水电顾问集团成都勘测设计研究院,成都610072

出　　处：《岩土力学》2011年第11期3349-3354,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金优秀国家重点实验室研究项目(No.50823005);国家自然科学基金项目(No.50709014);国家杰出青年基金资助项目(No.50925931)

摘　　要：传统的刚体极限平衡法和强度折减法在分析边坡稳定和加固时存在一定的局限性。基于变形加固理论,建立了基于弹塑性有限元分析的边坡稳定和加固分析方法。以余能范数作为边坡整体稳定评价的指标,通过强度参数降低过程中的余能范数的变化来确定边坡的整体稳定安全系数。加固的关键部位和加固力的大小通过边坡中不平衡力的分布来确定。滑动面则由方向相反的、成对的不平衡力的分界面来确定。针对3个经典边坡算例,分析了强度参数逐渐降低过程中的余能范数的变化和不平衡力的分布,确定了边坡的稳定安全系数以及相应的加固关键部位和加固力的大小。结果表明,变形加固理论基于岩土的三维非线性有限元分析,以此来进行边坡的稳定和加固分析是非常有效的,强度参数降低过程中不平衡力的发展演化过程反映的是边坡的破坏过程。The traditional rigid-body limit equilibrium method and finite-element-based strength reduction method has some problems in stability and reinforcement analysis.Based on deformation reinforcement theory（DRT）,a stability analysis method of slope is presented with elastoplastic finite element analysis.Plasticity complementary energy（PCE） is used to evaluate the whole stability of slope;and safety factor of slope can be obtained through the PCE curve with strength reduction factor.Reinforcement location and force can be determined by unbalance force distribution in the slope.Possible sliding surface also can be located on the boundary that direction reverse of unbalance force occurs.Three classical examples of slopes has been modeled and analyzed.The safety factor and reinforcement key location and force have been determined by the PCE curve and unbalance force distribution.The results indicate that the DRT based on nonlinear finite element analysis is effective in analysis of stability and reinforcement for rock and soil slopes.The failure process can be reflected by the development of unbalanced force with the strength reduction.

关 键 词：边坡 稳定性 变形加固 塑性余能范数 不平衡力 

分 类 号：O319.56[理学—一般力学与力学基础]