【摘要】 考虑土的抗剪强度在地震过程中的波动效应,在动强度的基础上将拟静力极限平衡分析与地震动力反应相结合,进行土工建筑物地震永久变形分析。首先,基于土工动力有限元分析确定潜在滑动体的平均角加速度时程和各土条底部的应力时程;进而,基于 Seed 或水科院动强度模式下的拟静力极限平衡分析,确定滑动体的时程抗滑力矩和时程屈服角加速度;最后,采用 Newmark 刚体滑块模型估算滑动体的累计滑动位移。算例计算表明,考虑材料的动强度得到的坝坡滑移量约为仅考虑静强度的坝坡滑移量的1～2倍,结果更为合理。更多还原

【Abstract】 A simplified procedure for evaluating aseismic stability of slope subjected to earthquake shaking,in which the effect of dynamic shear strength and time-history stress on the yielding angular acceleration of sliding block is taken into account,is presented. The fundamental feature of this procedure is the dynamic shear strength.The numerical computations are performed by using the proposed method.It is shown that the computed sliding displacement for a given core dam,with either method of dynamic shear strength properly considered,is more rational compared with the conventional computational results based on static shear strength.更多还原