【摘要】 根据广西高峰矿新采矿方法的工程实际情况,采用高能炸药的Joles-Wilkins-Lee(JWL)状态方程,以质点振动速度峰值PPV为主要指标,利用显式动力分析软件ANSYS/LS-DYNA模拟充填采矿中预裂缝对爆炸应力波的作用机理,分析爆炸应力波在充填环境下的传播特征以及在经过预裂缝和不同介质分界面的衰减规律。研究结果表明:爆炸应力波在经过预裂缝时,质点振动速度峰值急剧衰减,预裂缝具有良好的降振效应,降振率在80%~90%之间;不同介质的分界面弱结构具有一定的降振效应,降振率在3%~10%之间;在邻近爆源一侧,预裂缝和分界面表现出能量聚集效应,且距预裂缝和分界面越近,能量聚集效应越明显,其能量聚集率最大可达25%。更多还原

【Abstract】 According to the site of new mining method in Gaofeng mine in Guangxi Province,the mechanism of the pre-splitting crack to the explosive stress waves in filling-environment was simulated by the explicit dynamical analysis software package ANSYS/LS-DYNA.The numerical geometric model was built and JWL state equation of high explosive was used.The effect of blasting vibration on the pre-splitting crack was analyzed using the propagation characteristics and attenuation law of the explosion stress waves.The peak particle vibration(PPV) was used as discriminant index.The results show that the pre-splitting has a good damping effect,and the damping ratio is 80%-90%.The weak structure existing in the interface of different mediums shows a certain damping effect,the damping ratio is 3%-10%.The pre-splitting crack and interface display a certain energy gathering effect on the side close to the explosion source.And the closer the pre-splitting crack to interface,the more remarkable the energy gathering effect,and the highest ratio can reach 25%.更多还原