【摘要】 以拟建的某海底隧道工程为背景,采用FLAC对隧道掘进钻爆引起的震动效应进行了数值模拟。将爆破荷载以等效应力的方式加载于模拟炮孔之上,根据围岩类型和岩层覆盖厚度设计值选取典型的隧道断面进行模拟计算;提取出影响围岩稳定性的关键点位置的峰值振速及加速度值。数值模拟结果表明,各关键节点的振动速度、加速度均小于相应规范要求的临界值,因此选取的爆破参数满足爆破工程稳定性和安全性要求。同时,总结出侧压力系数对水平方向和垂直方向的振动效应的影响。更多还原

【Abstract】 By taking a subsea tunnel to be constructed as the research object,the ground vibration induced by blasting is analyzed numerically using FLAC.The explosive load is imposed on simultated surrounding blast holes with equivalent stress.A typical segment is chosen according to different surrounding rock types and rock cover thickness;peak values of velocity and acceleration of the key points affecting the stability of the rocks surrounding are taken.The result of simulation indicates that the level and vertical rapidity peak values satisfy those of subsea tunnel failure criterion,so the blasting parameters for calculation can satisfy the requirements of stability and security in subsea.At the same time,the influence of lateral pressure coefficient on vibration effects of both horizontal and vertical direction is generalized.更多还原