参数化分析减震沟对岩体爆破减震效应的影响

Parametric Analysis of the Influence of Damping Ditch on the Blasting Vibration Reduction Effect of Rock Mass

为了揭示减震沟对岩石爆破震动效应的影响,利用有限元软件ANSYS/LS-DYNA建立减震沟模型,对减震沟的长度、宽度和深度进行参数分析。研究表明:减震沟能有效衰减爆破地震波能量,并通过阻隔和干扰爆破地震波的传播来加快降低爆破震动。减震沟参数对爆破地震波能量传播的影响程度为:深度(3~5 m)﹥长度(1~3 m)﹥宽度(1~2 m)。在减震沟后的6.8 m到8.4 m内,减震沟会放大爆破地震波传播的能量,放大位置与减震沟深度直接相关。

In order to reveal the effect of damping ditch on rock blasting vibration effect,a damping ditch model was established by using the finite element software ANSYS/LS-DYNA and parametric analysis was carried out to investigate the influence of the depth,length and width of the damping ditch.It is found that the damping ditch could effectively attenuate the energy of blasting seismic waves,accelerate the attenuation of blasting seismic waves by blocking and interfering the propagation of blasting seismic waves.The influence of main parameters of the damping ditch on the energy propagation of blasting seismic waves is as follows:the depth(3~5 m)>the length(1~3 m)>the width(1~2 m).In the range of 6.8 m to 8.4 m after the damping ditch,it amplifies the energy of blasting seismic wave propagation,and the location of the amplification is closely related to the depth of the damping ditch.