特大断面浅埋隧道群控制爆破施工与震动监测技术研究

Research on Controlled Blasting Construction and Vibration Monitoring Technology for Super Large Section Shallow Tunnel Group

文章以贵安新区腾讯七星数据中心隧道群为研究对象,对隧道工程开挖施工爆破的控制技术进行了研究并对爆破振动波进行了监测。研究结果表明:1) 本项目浅埋隧道群采用CD法施工可有效控制爆破对周边环境的影响;2) 选择合理的掏槽形式、确定合适的循环进尺和台阶长度等技术措施,能有效控制爆破震动效应对隧道稳定性的影响;3) 地表监测点主振频率随着距离的增加而减少的趋势并不明显,说明爆破振动对钢筋混凝土套拱结构影响显著;4) 通过隧道内监测数据可知,岩石的两侧收敛位移较小,拱顶沉降位移较大,浅埋隧道应着重满足竖直方向受力要求。

Based on the blasting excavation of Tencent Qixing Data Center Tunnel Group in Gui’an New Dis-trict, Guizhou Province, the paper studies the vibration monitoring and control technology of tunnel engineering excavation blasting earthquake. The research results show that: 1) The construction of the shallow buried tunnels of this project using the CD method can effectively control the impact of blasting on the surrounding environment;2) The technical measures such as selecting a reasonable trenching form, determining the appropriate cycle footage and step length can effectively control the impact of blasting vibration on tunnel stability;3) The tendency of the main vibration frequency of the surface monitoring points to decrease with increasing distance is not obvious, indicating that the blasting vibration has a significant impact on the reinforced concrete sleeve arch structure;4) According to the monitoring data in the tunnel, it is known that the convergence displacement on both sides of the rock is small and the displacement of the arch top is large. The shallow buried tunnel should focus on meeting the vertical force requirements.