隧道爆破振动场中断层对岩体远场振动特性影响研究

Study on the Influence of the Broken Layer in the Blasting Vibration Field of Tunnel on the Far-Field Vibration Characteristics of Rock Mass

以穿过断层的联络通道爆破工程为背景,利用有限元软件建立三维数值模型,分析了爆炸振动波在岩体中的远场振动规律;系统研究了断层弹性模量、断层宽度的影响。研究表明:隧道轴向上观测点振动速度峰值呈先减小后增大的趋势,横向观测点振动速度峰值随H的增大而逐渐减小;不同弹性模量下振动速度变化规律一致,都呈先减小后增大再衰减的趋势;当断层弹性模量越低,爆破引起的振动响应越大,且振动响应衰减更快;随着断层宽度的增大,振动响应衰减更快,且在断层范围内波动性更大;且断层范围内,断层宽度对岩体振动响应有显著影响;断层宽度对岩体振动响应的影响主要集中在掌子面附近,断层宽度越宽,影响越显著。

Based on the blasting engineering of the connecting passage passing through the fault, a three-dimensional numerical model is established by using finite element software, and the far-field vibration law of explosion vibration wave in rock mass is analyzed. The effects of fault elastic modulus and fault width are systematically studied. The study shows, the peak value of vibration velocity at the observation point in the axial direction of the tunnel decreases first and then increases, and the peak value of vibration velocity at the transverse observation point decreases gradually with the increase of H. The variation law of vibration velocity under different elastic modulus is the same, which first decreases, then increases and then attenuates. When the fault elastic modulus is lower, the vibration response caused by blasting is larger, and the vibration response attenuation is faster. With the increase of fault width, the vibration response decays faster and fluctuates more in the fault range. Within the fault range, the fault width has a significant impact on the vibration response of rock mass. The influence of fault width on rock mass vibration response is mainly concentrated near the tunnel face. The wider the fault width, the more significant the impact.