【摘要】 依据爆炸动力学和弹性波动理论,分析了同段起爆在损伤岩体中所产生的爆破振动速度及引起的应力。然后,根据爆炸波在传播中的叠加特性,提出了隧道微差爆破后围岩质点振动速度和应力解析解。研究表明:微差爆破相邻段别的地震波形随传播距离的增加而相互接近、叠加,在起到干扰降震的同时,使围岩体对其震动响应出现选择放大的几率也增加。爆破振动速度和应力解析解的提出,为隧道开挖采用合适的爆破掘进方法、减少施工误差及提高围岩稳定性提供了理论依据。更多还原

【Abstract】 According to explosion dynamics and elastic wave theory,the blasting vibration velocity and stress field,induced by simultaneously blasting in the damaged rock mass are analyzed.And then,based on the superimposed properties of blasting wave,the analytic solutions of particle vibration velocity and stress of tunnel surrounding rock after millisecond blasting are put forward.The results show that seismic waves adjacent to the delay intervals in millisecond blasting are close to each other and superimposed with the increase of propagation distance.Millisecond blasting has not only the good effects of reducing vibration by wave interference,but also increases the probability of selective magnification on blasting-induced vibration.The study provides references for tunneling to choose the appropriate blasting excavation methods,reduce the construction error and enhance stability of the surrounding rock.更多还原