基于Newmark滑块位移法的堆积体边坡稳定性分析

Analysis on Stability of Debris Slope Based on Newmark Sliding Block Displacement Method

针对堆积体边坡稳定问题,基于摩擦滑移结构的抗震机理,在动力时程响应分析时考虑土体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,进而利用Newmark滑块位移法得到位移增量和累计滑动位移。计算结果表明,塑性滑动在滑动方向上的累计滑移量更符合实际工程。并根据地震Newmark位移与临界加速度两者之间存在较好的相关性,判别地震滑坡的危险度。

Aiming at the stability of debris slope,based on the seismic mechanism of friction sliding structure,the fluctuation effect of soil shear strength in earthquake is taken into account in dynamic timehistory response analysis,combining the pseudo-static limit equilibrium analysis with seismic dynamic response based on dynamic strength,the displacement increment and accumulative sliding displacement is acquired with Newmark sliding block displacement method. The results show that the accumulative slippage of plastic sliding in slip direction is more correspond to the actual project. The seismic landslide risk can be discriminated according to the better correlation existing between seismic Newmark displacement and critical acceleration.