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近邻双线隧道爆破开挖时,为了避免新建隧道爆破施工产生的地震波危及既有隧道的安全和稳定,基于数值模拟和现场试验,分析了层状岩体中采用钻爆法修建近距离双线隧道的爆破振动响应.结果分析表明,对于既有隧道,迎爆面侧墙处的振动速度和反射拉应力最大,而且振动速度具有很强的方向效应,隧道径向振动速度大于切向振动速度,其规律与现场爆破试验结果有较好的一致性.将爆破对新建隧道本身围岩的振动损伤度和对相邻隧道的振动影响结合起来综合考虑,提出了层状岩体隧道爆破施工中减轻振动的几种措施,并对隧道爆破参数进行了优化.图7,表4,参8.
In order to avoid the seismic wave generated by the new tunnel blasting construction endangering the safety and stability of the existing tunnel during the blasting excavation of the adjacent two-lane tunnel, based on numerical simulation and field test, The results show that the vibration velocity and the reflection tensile stress are the maximum for the existing tunnel and the facing wall, and the vibration velocity has a strong directional effect. The tunnel radial vibration velocity is greater than the tangential vibration velocity , And its regularity is in good agreement with the results of on-site blasting test.Combining the vibration damage degree of surrounding rock and the vibration of adjacent tunnel with blasting, the blasting construction of layered rock mass is put forward Several measures to reduce the vibration and optimize the tunnel blasting parameters are shown in Figure 7, Table 4, Reference 8.