爆破地震波作用下圆形洞室围岩振动速度分布规律

发布时间：2018-09-06 15:09

【摘要】：为了探究岩石开挖爆破地震波作用下邻近圆形洞室的动力响应规律,采用FLAC3D数值模拟软件研究爆破地震波作用下不同埋深圆形隧道洞壁和地表振动速度的缩放规律,以及对不同频率平面简谐P波入射时,隧道洞壁及地表振动速度的分布规律进行研究,并通过理论计算结果的对比分析,检验了数值模拟的可靠性。研究结果表明:隧道埋深会引起隧道洞壁及地表振动速度产生缩放效应:隧道埋深较浅时,隧道洞壁上半部分缩放效应大于下半部分,振动速度放大系数随埋深增加而减小;埋深较深时时,隧道洞壁各位置质点振动速度放大效应随埋深的增加呈现递增规律;地表振动速度放大系数峰值随隧道埋深的增加向背爆侧偏移;迎爆侧洞壁振动速度随入射波频率增加呈增大趋势;地表振动速度放大系数峰值随入射波频率增加向爆源方向偏移。
[Abstract]:In order to investigate the dynamic response of adjacent circular caverns under the action of rock excavation blasting seismic wave, the scaling law of vibration velocity of tunnel wall and surface of different buried circular tunnels under blasting seismic wave was studied by FLAC3D numerical simulation software. The distribution law of tunnel wall and surface vibration velocities under different frequency plane harmonic P-wave incidence is studied. The reliability of numerical simulation is verified by comparing and analyzing the theoretical calculation results. The results show that the tunnel depth will cause the scaling effect of tunnel wall and surface vibration velocity. When the tunnel depth is shallow, the scaling effect of the upper part of tunnel wall is greater than that of the lower part, and the magnifying coefficient of vibration velocity decreases with the increase of buried depth. When the depth of the tunnel is deep, the amplification effect of the particle vibration velocity increases with the increase of the buried depth, and the peak value of the velocity magnification factor of the surface vibration shifts to the back blasting side with the increase of the buried depth of the tunnel. The vibration velocity of tunnel wall increases with the frequency of incident wave, and the peak value of velocity magnification factor of surface vibration deviates to the direction of detonation source with the increase of frequency of incident wave.
【作者单位】：中国地质大学岩土钻掘与防护教育部工程研究中心;中国地质大学工程学院;
【基金】：国家自然科学基金面上项目(51379194) 武汉市黄鹤英才(科技)专项(2014)
【分类号】：U451.2

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