摘要
基于台阶地形爆破振动数值模拟与边坡振动监测实验,研究台阶地形爆破振动速度在传播过程中高程放大效应的产生及变化规律。结果表明,单个台阶坡顶质点的振动速度放大效应是在距爆源一定距离、达到一定高差的条件下产生的;坡顶质点振动速度放大倍数并不随台阶高度的增加而单调增加,在台阶高度超过某一临界值后,放大倍数随台阶高度的增加而减小。台阶高程对爆破振动速度既有放大作用,同时也随高度的增加产生衰减作用。根据模拟计算及现场观测数据分析结果,给出了台阶地形爆破振动速度预测模型,该模型为类似边坡工程的爆破地震波传播规律研究提供一定的参考。
The present study investigates the growth and variation of the amplification effect in the propagation of the blasting vibration velocity in step topography. The results indicate that the blast vibration elevation amplification effect on a single step occurs at a certain distance and elevation; the peak particle velocity magnification of the top of the slope doesn’t increase monotonously with the increase of the elevation; and the magnification decreases when the elevation exceeds a certain critical value. The elevation exerts an effect of both amplification and attenuation on the blasting vibration velocity. According to the data analysis of the numerical simulation and the field experiment,a model of the blasting vibration velocity prediction on step topography was presented,providing reference for the research of blasting seismic wave propagation law in similar slope projects.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2017年第6期1017-1022,共6页
Explosion and Shock Waves
基金
国家自然科学基金项目(51604017)
中央高校基本科研业务费专项基金项目(FRF-TP-16-017A3)
关键词
台阶地形
高程差
爆破振动
放大效应
step topography
elevation difference
blasting vibration
amplification effect
