锚碇式隧道爆破振动效应数值试验

发布时间：2018-03-24 08:00

本文选题：锚碇隧道　切入点：爆破振动　出处：《地下空间与工程学报》2017年04期

【摘要】：为了研究南溪长江大桥锚碇隧道后续洞掘进爆破时隧道围岩的振动特征,采用动力有限元(LS-DYNA)数值计算的方法,对锚碇隧道后续洞掌子面开挖至隧道轴线27 m处的工况进行了数值计算,将计算结果与现场实测数据进行了对比分析,证明了数值计算的可行性。根据数值计算结果对隧道中隔岩墙的振动特征进行分析可以得到以下主要结论:先行锚碇隧道迎爆侧水平向的峰值振动速度最大。随着距离爆破掌子面轴向距离的不断增大,先行洞迎爆侧边墙上各监测点在三个方向上的振速峰值分量越趋近于一致。后续洞掘进爆破引起的在中隔岩墙上的最大振速峰值的位置位于掌子面掘进方向上约1 m左右。在后续洞进行爆破开挖时,振速峰值均随着距离掌子面轴向距离的增大而减小,并且沿隧道掘进方向的衰减速度比反方向的衰减速度慢。
[Abstract]:In order to study the vibration characteristics of surrounding rock of the Anchorage tunnel of Nanxi Yangtze River Bridge during subsequent excavation blasting, the dynamic finite element method (LS-DYNA) is used to calculate the vibration of surrounding rock. In this paper, the numerical calculation is carried out on the working condition of excavating the surface of the Anchorage tunnel from the face of the tunnel to 27 m of the tunnel axis, and the calculated results are compared with the measured data on the spot. The feasibility of numerical calculation is proved. According to the results of numerical calculation, the main conclusions can be drawn from the analysis of the vibration characteristics of the wall in the tunnel: the peak vibration velocity of the horizontal direction of the first Anchorage tunnel is maximum with the detonation of the tunnel. The axial distance from the blasting face of the blasting is increasing, The peak component of vibration velocity in three directions is closer to the same. The position of peak vibration velocity on the wall of the middle wall caused by subsequent tunneling blasting is about the same in the heading direction of the face of the face. 1 m or so. During the blasting excavation of the follow-up tunnel, The peak value of vibration velocity decreases with the increase of axial distance from the face of the palm, and the attenuation velocity along the tunneling direction is slower than that in the reverse direction.
【作者单位】：西南交通大学土木工程学院;
【基金】：国家自然科学基金(41272321)
【分类号】：U455.6

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