爆破地震作用下重力式挡土墙的稳定分析

基于转动块体方法，对爆破地震作用下重力式挡土墙作了动力稳定分析，讨论了爆破振动频率、地面振动加速度与挡土墙位移的关系，研究了加速度阈值系数对于挡土墙某些参数的敏感性，考虑爆破地震重复作用的累积变形，结合前人的实测爆破振动数据，基本确定了挡土墙开始产生位移的地面振动速度阈值。工程实例说明，振动速度控制在该阈值以下，挡土墙是安全的。

DYNAMIC STABILITY ANALYSIS OF GRAVITY RETAINING WALLS UNDER BLAST-INDUCED VIBRATION

Based on the X. Zeng and R. S. Steedmans rotation block method,the dynamic stability analysis of gravity retaining walls under blast-induced vibration is conducted. The relationship among the earth acceleration,vibration frequency and the displacement of gravity walls is discussed. The sensitive character of the acceleration threshold to the parameters of gravity walls is studied. Taking account of the accumulated deformation under repeated blast-induced vibration and the site measured data,the earth velocity threshold is estimated. A blasting engineering example shows that the gravity retaining wall is safety,if the blast-induced vibration velocity is lower than the velocity threshold.