桩井爆破振动在邻近边坡产生的特殊效应

为研究桩井爆破地震波在邻近自然边坡传播规律，对桩井开挖爆破振动速度进行了现场测试。在邻近桩井的台阶坡脚及边缘各布置一个测点。测试结果表明，位于台阶边缘测点的径向、垂向振动速度及主频率较位于坡脚处的测点存在增大趋势，出现了坡面效应；切向振动速度及主频率存在减小的趋势，说明爆破地震波的速度及频率变化具有一致性，且爆破地震波的放大效应具有方向性，以垂向为主。坡面效应合理地解释了爆破地震波在台阶边缘的振速放大效应，同时通过“鞭梢效应”对爆破地震波频率的分析，验证了坡面效应的合理性。

Special effects of vibration caused by pile-well blasting in adjacent slope

To study the propagation of seismic wave caused by pile-well blasting on the natural slope nearby, field test of vibration velocity is carried out during the excavation of pile-well blasting. Two measuring points are set on the step adjacent to the pile-well, one is on the foot of the slope, another is on the edge of step. The results show that the radial, vertical vibration velocities and the main frequency of measuring point on the edge of step have an increasing trend than ones on foot, slope effect appearing. While it has a decreasing trend in the tangential direction, illustrating that the changes of vibration velocity and frequency of blasting seismic wave are in consistency; and the amplification effect of blasting seismic wave has directionality; among them the vertical is the main. Slope effect explains the amplification effect of blasting seismic waves on the edge of step reasonably. Meanwhile, the analysis of blasting seismic wave frequency of "whiplash effect" verifies the reasonability of the slope effect.