基于露天矿高陡边坡岩体的爆炸应力波响应仿真研究

通过爆炸应力波在高陡边坡体远场传播的三自由度动力学模型,利用Matlab仿真了其动态响应过程。单点爆源的爆炸应力波激励的仿真结果表明,边坡岩体介质位移响应下部的最大,中部的次之,上部的最小,之间呈幂律关系衰减,同时具有明显的滞后效应;频率响应与位移响应相同,随着步长增加,高频成份迅速衰减。多点爆源的爆炸应力激励仿真结果表明,边坡岩体介质位移响应上部的最大,中间的次之,下部的最小,爆炸应力波在边坡顶部呈动力放大效应;频率响应则相反,下部最大,中部的次之,上部最小。仿真结果与现场测试结果相符。

Simulation of Explosion Stress Wave Response on High-Steep Rock Slope in open Mine

Based on the three-degrees-of-freedom dynamics model set up for the far-field spreading of explosion stress wave in high-steep slope,the dynamic response process of explosion stress wave was simulated by Matlab engineering software.The simulation result of the explosion stress excitation of single point exploding spot showed that the medium displacement response at the bottom of slope was the biggest one was second at the middle part of slope,one was the smallest at the top of slope,and relation of them followed power law to attenuate,the displacement response had apparently hysteresis effect at the same time;the frequency response was same as displacement response,the high frequency of constituents quickly attenuated with the increase of steps.With respect to the explosion stress excitation of multipoint exploding spots,the simulation result showed that medium displacement response of slope rock at the top of slope was the biggest,one was second at the middle part of slope,one was the smallest at the bottom of slope,and the explosion stress wave had dynamic amplification effect at the top of slope;On the contrary,the frequency response was the biggest at the bottom of slope,it was second at the middle part of slope and it was the smallest at the top of slope.The simulation results matched with the results on site testing.