岩质高边坡爆破质点振动效应分析

Monitoring and Analysis of Particle Vibration of Rock Slope under Blasting Loading

针对凹山铁矿采场边坡生产爆破工程,利用爆破测振仪对现场爆破作用下岩体质点振动速度进行监测,得到边坡质点振动速度的衰减规律。结果表明:边坡质点振动速度随距离的增加呈指数衰减趋势,在台阶局部由于高差的存在振动速度出现放大现象。根据高程放大效应对经验公式进行二元回归分析,得到更准确的爆破振动速度预测模型,为矿山生产爆破及时调整参数,保证边坡爆破的安全施工提供了有效依据。

In view of the rock slope blasting excavation of the slope of the Aoshan iron ore, the blasting is the main factor that affects the stability of the slope. Through the monitoring data of the rock mass point vibration under the action of blasting, the vibration attenuation law of the slope is obtained. The measured data and the simulation results show that the dynamic finite element： with the increase of the distance, the particle vibration velocity of slope will decrease in accordance with an exponential equation, and the vibration velocity shows amplification phe- nomenon due to the height difference exists in the local steps. According to the elevation amplification effect, the dual regression analysis was made to abtain more accurate predictive models of blasting vibration velocity, the blas- ting parameters are adjusted in time to ensure the smooth completion of the slope blasting construction.