潘口水电站面板堆石坝施工度汛断面坝坡稳定性分析

在对潘口水电站面板堆石坝施工期洪水作用下坝体与坝基渗流场进行有限元模拟的基础上,采用线性和非线性强度参数分析了施工度汛断面坝坡稳定性。结果表明,潘口面板堆石坝临时度汛断面在施工度汛期内渗流稳定性及上下游坝坡稳定性均满足现行规范要求,汛期安全性有保障;度汛期内临时断面采用挤压边墙和垫层料联合防渗的方案是可行的;与线性强度参数相比,非线性强度参数更符合堆石料的抗剪强度特性,其稳定性计算结果更合理,从而为潘口水电站面板堆石坝施工度汛断面的设计方案提供了技术支持,也为混凝土面板堆石坝施工期临时度汛坝体的坝坡稳定安全问题提供了一种有效的分析方法。

Stability Analysis of Dam Slope of Temporary Dam Body of Pankou CFRD for Flood Control During Construction Period

Based on the numerical simulation of seepage field for temporary dam body of Pankou CFRD using finite element method (FEM) under the action of flood of the river during construction period, the dam slope stability of the temporary dam body was studied by using linear and nonlinear strength parameter analysis method. The result indicates that the stability of dam slopes could meet the requirements of the standards; it is safe during the flood period and offers important reference to engineering design; the joint seepage control measure with concrete extruded wall and cushion material is feasible for the temporary dam body of CFRD for flood control during construction period; compared with the linear strength parameters, the nonlinear strength parameter meets the shear strength characteristics of rockfill better, and the stability of dam slope is more reasonable. Thus, it provides technical support for design scheme of the temporary dam body of Pankou CFRD, and offers an effective analysis method for study on the dam slope stability of CFRD in flood control during construction period.