基于等效加速度的岩质边坡爆破动力稳定性

基于刚体极限平衡法及等效加速度计算方法,根据爆破振动峰值速度衰减规律和振动速度时程曲 线,以一定时间步长进行整个爆破过程不同时刻边坡稳定系数的分析,得到了相应爆破振动作用下的边坡动 力稳定性安全系数时程曲线。结果表明,基于等效加速度的边坡爆破动力稳定性分析,对稳定性较好的边坡, 爆破振动荷载作用下,稳定性安全系数一般降低2%~4%,振动主频率越高,则边坡稳定性系数越大,而常规 的折减系数法可能放大爆破振动对边坡稳定性的危害。

Rock slope stability under blasting vibration based on equivalent acceleration

Based on the limit equilibrium method for rigid block and the equivalent acceleration method,according to the attenuation principle of the peak blasting vibration velocity and the time history of the velocity,the time-history curve of the dynamic stability safety factor of the slope under blasting vibration was obtained by analyzing the whole blasting vibration process at a certain time step.Analysis indicates that for the slopes with better stability,the safety factor is generally reduced by 2% to 4% under...