【摘要】 在土石坝的抗震稳定分析中常采用拟静力法。地震动态分布系数沿坝高呈非线性分布,因而采用竖向条分法将造成水平惯性力计算误差,在分析产生误差机理的基础上,尝试将极限平衡水平条分法应用于土石坝抗震稳定分析中。根据极限平衡法的基本原理,推导了满足力和力矩平衡的水平条分法计算公式。运用0.618多变量轮换优选法,实现了坝体边坡分层自动搜索最危险滑动面。算例分析表明,极限平衡水平条分法对于土石坝抗震稳定分析更为合理,其计算结果可以为土石坝的抗震稳定分析提供参考依据。更多还原

【Abstract】 The quasi-static force method is often used in seismic stability analysis of earth-rock dam.Because of the nonlinear distribution of seismic dynamic distribution coefficient,the adoption of vertical slice method to calculate horizontal inertia force will cause errors.In this paper,based on the analysis of the error mechanism,the limit equilibrium horizontal slice method is applied to analyse the seismic stability of the dam.In accordance with the basic principle of limit equilibrium method,the formula of limit equilibrium method is derived,which can meet the force and moment balance.In searching the critical surface,0.618 optimization method of variable exchange is applied,this method can realize stratified search automatically.The results show that limit equilibrium horizontal slice method is more reasonable,and the calculation results can provide reference for seismic stability analysis of earth-rock dam.更多还原