摘要
鉴于等比例强度折减法在折减过程中对粘聚力和内摩擦角采用同一系数,并不能真实模拟出结构的失稳破坏过程。依托于某一实际水利工程设计资料,建立该工程岩质边坡的非线性有限元模型,并在计算中重点考虑断层及岩层层面等软弱结构面的影响,基于双折减系数法对该含软弱结构面的岩质边坡在动力作用下的稳定性进行了研究,并与等比例强度折减法的结果进行对比。研究结果表明:双折减系数法得到的安全系数略大于等比例强度折减法,边坡失稳时的特征点位移值偏大,说明等比例强度折减法计算结果偏于保守;采用双折减系数法分析含软弱结构面岩质边坡动力稳定性是可行的,且能更加真实地反映出结构在失稳破坏过程中粘聚力和内摩擦角各自的安全储备。
In view of the fact that the equal proportion strength reduction method uses the same coefficient for cohesion and internal friction angle in the reduction process,it can not really simulate the instability and failure process of the structure.Based on the design data of a practical water conservancy project,this paper establishes a nonlinear finite element model of the rock slope of the project,and focuses on the influence of weak structural planes such as faults and rock layers in the calculation.Based on the double reduction coefficient method,the stability of the rock slope with weak structural planes under dynamic action is studied,and the results are compared with those of the equal proportion strength reduction method.The research results show that the safety factor calculated by the double reduction coefficient method is slightly larger than that by the equal proportion strength reduction method,and the displacement value of the characteristic point when the slope is unstable is too large,which indicates that the calculation result of the equal proportion strength reduction method is conservative;It is feasible to analyze the dynamic stability of rock slope with weak structural plane by using the double reduction coefficient method,and it can more truly reflect the safety reserves of cohesion and internal friction angle in the process of structural instability and failure.
作者
兰荔
蒋涛
LAN Li;JIANG Tao(Jiangxi Province Yuanhuiqu Project Management Bureau,338000,Xinyu,Jiangxi,PRC;Jiangxi Province Geological and Environmental Research Institute Co.,Ltd,330002,Nanchang,PRC)
出处
《江西科学》
2023年第4期768-772,共5页
Jiangxi Science
关键词
水利工程
岩质边坡
双折减系数法
等比例强度折减法
软弱结构面
动力稳定性分析
irrigation works
rock slope
double reduction coefficient method
equal proportion strength reduction method
weak structural plane
dynamic stability analysis
