爆破中隔振孔对Rayleigh波的隔振效果分析

Vibration isolation effect of the damping hole on the Rayleigh wave during blasting

以理论分析为基础,研究了隔振孔对Rayleigh波的主动隔振计算流程,在弹性体半解析边界元法的基础上,推导出弹性半空间地层介质中隔振孔减振的边界元方程,并用MATLAB编制相关计算程序,计算并分析了弹性半空间介质中单排隔振孔的尺寸等参数对减振效果的影响规律并用实际案例进行验证。结果表明:随着隔振孔半径的增大,有效减振区域面积逐渐增大,减振效果逐渐上升,并且隔振孔中心线位置处的减振效果最佳。当采用单排隔振孔进行隔振时,隔振孔的半径对整体的减振效果有重要影响,为求获得良好的减振效果以及扩大减振区域面积,应尽可能使用孔径较大的隔振孔,隔振孔孔距应控制在一定范围内,并尽可能降低。

Based on the theoretical analysis, the active vibration isolation process on Rayleigh wave of damping hole was stud-ied. On the basis of semi-analytical boundary element method of elastic body, the boundary element equation of vibration reduc-tion caused by damping hole in elastic semi-spatial medium was deduced, and the relevant calculation program was compiled with MATLAB. The influence of the parameters such as the size of the single-row damping holes in the elastic semi-spatial me-dium on vibration reduction was calculated and analyzed, and verified by an actual case. The results showed that with the in-crease of the radius of the damping hole？ the effective area of the vibration reduction increased gradually, and the vibration re-duction effect increased gradually too. The vibration reduction effect of centerline of the damping hole was best. When using the single-row damping holes, the radius of damping hole played an important impact on the vibration reduction effect. In order to obtain good vibration reduction effect and expand the vibration reduction area, large diameter of damping hole should be used as much as possible, and the spacing should be controlled within a certain range vibration reduction as low as possible.