摘要
基于动接触降强算法,以结构面上接触点对全部屈服破坏即接触点对控制面积全部屈服作为失稳判据,提出了一种改进的坝肩动力稳定分析方法。通过对遭受实际地震的某碾压混凝土拱坝坝肩稳定动力分析,结果表明:利用改进的坝肩动力稳定分析方法,左岸坝肩岩体稳定安全系数为2.4,右岸坝肩岩体稳定安全系数为3.0;利用拟静力法,左岸为2.116,右岸为2.945;与拟静力法相比,改进的坝肩稳定分析方法考虑了坝肩岩体结构面的非线性特性,反映了结构面上非线性特性引起的拱端推力的变化,所以本文方法计算得到的坝肩稳定安全系数是较为合理的,能够较为真实地反映拱坝的抗震工作性态。
Based on the dynamic contact strong reduction algorithm,took all contact point pairs in structure surface being yield failure as unstability criterion,an improved dynamic stability analysis method for dam abutment is put forward.A RCC arch dam which suffered from the actual earthquake abutment stability of dynamic analysis is studied,and conclusion is as follows:the left bank abutment rock mass stability safety coefficient is 2.4 and the right is 3.0 which using the method of improved dynamic stability analysis of dam abutment;the left is 2.116 and the right is 2.945 which using the pseudo-static method.Compared with the pseudo-static method,improvement of dam abutment stability analysis method in this paper considered the nonlinear characteristics of dam abutment rock mass structure surface,and reflected the change of the arch abutment thrust caused by structural surface nonlinearcharacteristics,the stability safety coefficient of dam abutment calculated via the method proposed in this paper is reasonable,and it reflects the real response of arch dam seismic workability state.
作者
李晓娜
赵杰
李同春
何金文
Li Xiaona;Zhao Jie;Li Tongchun;He Jinwen(School of Water Resources and Hydro-electric Engineering,Xi’an University of Technology,710048,Xi’an,China;Agricultural Engineering Institute,Hohai University,210098,Nanjing,China;College of Hydraulic&Environmental Engineering,China Three Gorges University,443002,Yichang,China)
出处
《应用力学学报》
CAS
CSCD
北大核心
2019年第5期1104-1110,1259-1260,共8页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(51809212)
陕西省自然科学基础研究计划资助项目(2018JQ5132)
陕西省教育厅专项科研计划项目(18JK0575)
关键词
超载法
强度折减法
动接触
坝肩动力稳定
拟静力法
overloading method
strength subtraction
dynamic contact
dam abutment dynamic stability
pseudo-static method
