多排减振孔对台阶爆破地震波减振作用的研究

Study on the vibration damping effect of multi-row vibration damping holes on the seismic wave of bench blasting

为研究多排减振孔的减振机理,基于单一减振孔对应力波传播产生的干扰作用,将多排减振孔视为应力连续位移不连续结构面模型。以P波为主要研究对象,根据P波经过多排减振孔后的衰减公式,对影响透射波强度的因素进行分析。通过ANSYS/LS-DYNA对P波在有无减振带的条件下的传播情况进行数值模拟,对比分析两组数值模拟中P波的传播过程以及波阵面情况。研究结果表明:在入射波与岩石介质条件相同的情况下,多排减振孔的减振率随应力波入射角度减小而减小;虽然应力波经过多排减振孔后会产生减振效果,但随着应力波传播距离增加,应力波恢复稳定传播,此时减振孔丧失减振作用。

In order to study the vibration damping mechanism of multi-row vibration damping holes,based on the stress wave disturbance of the single-row vibration damping hole,the multi-row vibration damping holes were regarded as a model with continuous stress and discontinuous displacement.Taking the P wave as the main research object,according to the attenuation formula of the P wave after passing through multi-row vibration damping holes,the factors affecting the intensity of transmission waves were analyzed.Numerical simulations of the propagation of the P wave with or without the damping band were carried out,and the propagation processes and the wave surfaces in the two numerical simulations were compared and analyzed.The results show that the vibration damping rate of multi-row vibration damping holes decreases as the incident angle of the stress wave decreases under the same conditions of incident wave and rock medium.Although the vibration damping effect could be obtained after the stress wave passes through multi-row vibration damping holes,the stress wave resumes stable propagation with the increase of the propagation distance,and then the vibration damping holes lose its effect at this time.