两相近隧道竖井爆破振动监测与分析

为保证秦岭天台山隧道两通风竖井的安全,开展竖井爆破振动监测试验,在两竖井内分别布置测点,研究开挖爆破对两竖井井壁结构的振动效应。通过对典型装药段爆破引起的三向振动速度分量分析,得到了大直径竖井全断面爆破引起井壁振动的传播规律与分布特征。结果表明:先行井掏槽爆破由于仅存在一个自由面,引起爆破井内振动最大,临近井迎爆侧振动大于背爆侧,且周边爆破引起的振动最大;掏槽与第一辅助爆破引起临近竖井井壁环向与垂向振动呈现先增大后减小的趋势;竖井爆破近区,受临近先行井空洞的影响,井壁径向与垂向振动较大。研究结果对类似工程具有一定的指导意义和参考价值。

Monitoring and Analysis of Blasting Vibration in Two Adjacent Tunnel Shafts

In order to ensure the safety of two ventilation shafts in Qinling Tiantaishan tunnel, the vibration monitoring test of shaft blasting is carried out, and the measuring points are arranged in the two shafts respectively to study the vibration effect of excavation blasting on the shaft wall structure of the two shafts. Based on the analysis of three-dimensional vibration velocity component caused by blasting in typical charging segment, the propagation regularity and distribution characteristics of shaft wall vibration caused by full face blasting in large diameter shaft are obtained. The results show that there is only one free surface in the cutting blasting of the leading shaft, the vibration in the blasting shaft is the largest. The vibration on the facing blasting side of the adjacent well is greater than that on the back blasting side, and the vibration caused by the contour blasting segment is the largest. The circumferential and vertical vibrations show a tendency to increase first and then decrease. The area near the vertical shaft blasting is affected by the cavity of the adjacent prior shaft, and the radial and vertical vibrations of the shaft wall are larger. The research results have certain guiding significance and reference value for similar projects.