【摘要】 利用拟静力概念,将塑性极限分析运动学定理与抗剪强度折减技术相结合,建立地震条件下土坡的极限平衡状态方程,以此确定土坡的屈服加速度系数与临界安全系数及相应的潜在破坏模式;进而对于在给定的荷载条件下不能满足抗震稳定性要求的土坡,考虑采用阻滑桩加固方式,根据桩侧有效土压力的合理分布模式导出极限平衡状态时桩侧抗力的解析式,以此进行土坡加固中阻滑桩的简化设计.通过一定的变动参数计算与对比分析,探讨了水平地震加速度系数对阻滑桩侧向极限抗力与最优加固位置的影响.研究表明:考虑地震效应的阻滑桩最优加固位置处于边坡坡脚处,因为较小的加固力就能使边坡达到设计的安全系数值;地震加速度系数对阻滑桩所需提供的加固力有明显影响,且地震加速度系数越高则影响越显著.更多还原

【Abstract】 Based on the kinematic method of limit analysis and the reduction technique of shear strength,the equation for expressing the critical limit-equilibrium state of slope subjected to earthquake loads is formulated and is employed to define the yield acceleration factor,the overall safety factor and the corresponding critical failure mechanism for a slope within the framework of the pseudo-static approach.For the slope with stabilizing piles,the analytical expression is also derived and the stabilizing force supplied by piles is solved by mathematical optimization technique,which will be used in the structural design of pile.Several results are presented in order to illustrate the influence of seismic forces on the stabilizing force and the optimum location of pile placement.The research shows that the optimal location of the stabilizing piles against landslide in various earthquake acceleration coefficient cases examined is near the toe of the slope,where the force provided by the piles to achieve the design safety factor takes the lowest value.It also shows the effect of earthquake acceleration coefficient on dimensionless stabilizing force is remarkable,especially under high earthquake acceleration coefficients.更多还原