柞小公路隧道爆破震动波现场监测与分析研究

Analysis, Study and In-situ Monitoring of Blasting Waves in Zhaxiao Road Tunnel

依托西(安)康高速公路8标和18标段的施工工程,对小间距隧道围岩爆破开挖施工震动波传递规律进行了现场监测与分析研究,给出了两标段不同围岩级别的爆破震动波速衰减方程,通过分析预测给出了不同围岩级别的爆破安全设计距离。经对千枚岩和灰岩的爆破震动波速分析对比,给出了在不同岩性中波速传递的规律性。通过对振动波速的测试结果分析,获得了不同方向的波速传递规律和爆破震动波的最大影响区域范围和对既有隧道围岩与支护稳定性的影响范围,所获结论可供小间距隧道工程设计与施工参考。

Based on tunneling at 8 and 18 tender lots on Xi＇an-Ankang expressway, analysis, study and in-situ monitoring for the propagation regulations of seismic waves caused by blasting in surrounding rocks of the close-spaced tunnels were carried out. By analysis and regression, attenuation equations of blasting waves were proposed for different surrounding rock grades in two lots, and the safety distances of blast were forecasted in different surrounding rock grades. By contrasting and analyzing the blasting waves in phyllite and limestone, the transfer laws of blasting waves were set up for different rock properties. The influence regions of blasting wave in surrounding rocks were given by analyzing the monitoring results of vibration wave velocities, and the influence regions for the surrounding rock stability of existing tunnels were also acquired. Results obtained here-in can be referred to by the design and construction of close-spaced tunnels.