地震作用下土钉支护边坡震后位移分析

基于土钉弹性支座假设，考虑了地震作用时边坡滑动体实时动态滑移对土钉受力的影响，结合拟静力极限平衡法推导了土钉受力实时动态变化与边坡震后位移计算表达式，提出了一种地震作用下土钉支护边坡震后位移计算的改进方法。结合算例分析表明，考虑与不考虑土钉受力实时动态变化的两种计算方法获得的边坡水平位移时程曲线规律基本一致，皆呈阶跃式增大趋势，但考虑土钉受力实时动态变化的改进计算方法得出的震后位移较不考虑的结果小，两种方法计算结果的差异随着土坡整体稳定性的提高而逐渐减小。结合相关文献中土钉支护边坡振动台试验数据，验证了改进方法的合理性。

Post-seismic displacement analysis of soil-nailed slope under earthquake

Based on the assumption of elastic support of soil nail, the expressions for calculating the real-time dynamic change of soil nail force and the seismic displacement of slope are derived by using the pseudo-static limit equilibrium method, considering the influence of real-time dynamic slip during earthquake. An improved method is proposed for calculating the seismic displacement of soil nailing slope under earthquake. The results of an example analysis show that the calculated time history curve of the slope horizontal displacement with and without considering the real time dynamic change of soil nail force are basically consistent. All results present a trend of step-wise increase, but the horizontal slope displacement calculated by the improved method is smaller, and the differences between results from two methods decrease gradually with the improvement of the overall stability of the slope. In the end, the rationality of the improved method is verified by comparing with the experimental data of shaking table test for a soil nailing slope.