刚体极限平衡法在某闸坝抗滑稳定分析中的应用

Application of Rigid Body Limit Equilibrium Method on Stability Analysis of a Sluice Dam

为了评估某冲砂闸坝基的表层和深层抗滑稳定性,采用二维刚体极限平衡法对该闸室的表层抗滑稳定、闸基应力和软弱破碎带组成的不利结构面进行系统分析计算,结果表明:(1)闸室在各工况时对应的抗剪和抗剪断稳定安全系数均大于规范最小允许值,最大竖向应力小于基岩极限承载力,闸室的表层抗滑稳定性和基础承载力状态良好;(2)当考虑软弱破碎带的深层抗滑稳定时,各工况下闸坝的抗滑力均远大于下滑力,说明该泄洪冲砂闸坝基的深层抗滑稳定好,Cr1和Cr2软弱破碎带组成的不利结构面不会造成冲砂闸坝基失稳。

In order to assess a discharge of dam foundation surface and deep anti sliding stability,using twodimensional limit equilibrium method on the chamber surface,the anti sliding stability of the sluice foundation stress and weak fracture zone composed of unfavorable structural surface of system analysis, results showed that：（1）chamber in each condition when the shear and shear stability safety coefficient is greater than the minimum allowed value is less than the standard,the ultimate bearing capacity of bedrock stress maximum vertical bearing capacity,good stability and anti sliding surface based chamber;（2）when considering the deep weak fracture zone of the anti sliding stability of timing,the anti sliding force is larger than the sliding force of dam under different working conditions the deeper,the stability of flood discharge,Cr1 and Cr2 will not face unfavorable structural weak fracture zone composed of sand caused by the instability of the dam foundation.