考虑强度参数非线性的粗粒料坝坡稳定性  

Stability analysis of coarse-grained materials dam slope considering nonlinear shear strength

作　　者：卢晓春[1,2] 田斌[1] 孙开畅[1] 

机构地区：[1]三峡大学水利与环境学院,湖北宜昌443002 [2]武汉大学水利水电学院,湖北武汉430072

出　　处：《武汉大学学报（工学版）》2014年第1期34-38,45,共6页Engineering Journal of Wuhan University

基　　金："十一五"国家支撑计划项目(编号:2008BAB29B02);国家自然科学基金资助项目(编号:90815018);三峡大学人才科研启动基金项目(编号:KJ2012B008)

摘　　要：对高应力状态下粗粒料抗剪强度的线性和非线性强度理论进行了讨论,指出了基于线性强度指标在粗粒料坝坡稳定性分析中的不足之处,并探讨了非线性抗剪强度的表达及其计算参数的取值.在此基础上,对非线性抗剪强度在坝坡稳定性分析中的应用进行了研究,给出了迭代算法,编制了能考虑非线性抗剪强度的坝坡稳定性分析程序,提出了迭代计算精度的控制标准,并对潘口面板堆石坝临时度汛断面的坝坡稳定性进行了计算研究.研究表明,粗粒料坝坡稳定性分析中应采用非线性抗剪强度指标.The linear shear strength theory and the nonlinear shear strength characteristic for coarsegrained materials under high confining pressure are discussed; and then the insufficiency of dam slope sta bility analysis for coarse-grained materials dam with linear shear strength parameter is pointed out. The safety factor of linear analysis is smaller than that of nonlinear analysis and the slip surface of linear analysis is shallow. The expression and calculation paramters of nonlinear shear strength are discussed. On the basis of dam slope stability analysis with nonlinear shear strength, the iterative algorithm is given. A computer program is developed for slope stability analysis of circular slope considering nonlinear strength; and the control criterion of calculation accuracy is proposed. Then, the stability of the dam slope of temporary dam body of Pankou rockfill dam for flood control during construction period is studied. It is concluded that the nonlinear shear strength should be adopted in the stability analysis of coarse-grained material dam slope,

关 键 词：粗粒料 坝坡 稳定分析 非线性 抗剪强度 

分 类 号：TV64[水利工程—水利水电工程]