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随着我国地下工程的大量建设,在新建硬岩隧道与既有隧道间距较小的情况下进行爆破开挖,产生的爆破震动波会危及隧道支护结构的安全和稳定。因此,研究隧道爆破开挖对既有隧道和开挖隧道支护结构的稳定性影响,具有重要的理论意义和工程实用价值。本文运用便携式微机控制数字输出测震仪进行爆破震动测量,同时,采用软件进行非线性数值模拟计算,分析隧道爆破开挖对既有隧道和开挖隧道支护衬砌的影响,讨论爆破震动影响下隧道支护方式的优化。
With the massive construction of underground engineering in our country, the blasting excavation is carried out under the conditions of small distance between the newly built hard rock tunnel and the existing tunnel. The blasting vibration wave produced will endanger the safety and stability of the tunnel supporting structure. Therefore, it is of great theoretical significance and practical value to study the influence of tunnel blasting excavation on the stability of the existing tunnel and excavation tunnel support structure. In this paper, the use of portable computer-controlled digital output seismometer for blasting vibration measurement, the same time, the use of nonlinear numerical simulation software to analyze the impact of tunnel blasting excavation of existing tunnels and excavation tunnel support lining to discuss the impact of blasting vibration Tunnel Support Optimization.