摘要
基于声波测试原理,利用RSM-SY5智能型声波仪,对某露天矿围岩在爆破冲击荷载作用下产生的损伤进行了现场实验研究。研究结果表明:爆破冲击荷载对距离爆源7 m范围内的岩石会造成损伤破坏,其损伤程度随着岩石与爆源距离的增大而减小;岩体声波速度随着爆破次数的不断增加而逐渐降低,多次爆破对岩石具有损伤累积效应;多次爆破的累积损伤不是单次爆破损伤的简单叠加,具有非线性特性,且距离爆源越近爆破累积损伤效应越明显。
Based on the sound velocity measurement theory, using RSM-SY5 intelligent sound wave apparatus, damage of the surrounding rock under blasting load in a strip iron mine was studied by insitu tests on sound waves. It is shown that the damage range of the surrounding rock caused by blasting excavation is 7 m in this strip iron mine, and the damage degree decreases with the increase of the distance of the surrounding rock from the blasting center. The sound velocity in rock mass decreases gradually with the increase of the blasting times and it means that the repeated blasting loads present a cumulative damage effect to rock mass. The cumulative damage is not the simple addition of the damage induced by the repeated single blasting loads, and takes on a non-linear increase. And the shorter the distance of the rock mass from the blasting center is, the more distinct the cumulative damage effect is.
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2009年第3期275-280,共6页
Explosion and Shock Waves
基金
国家自然科学基金项目(40674017)
关键词
爆炸力学
损伤
爆炸载荷
岩石
损伤度
声速
累积损伤
mechanics of explosion
damage
blasting load
rock
damage degree
sound velocity
cumulative damage
