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采用现场监测试验及数理统计相结合的方法,对隧道进出口段变形监测开展了系统的研究。对洞口地表进行变形监测分析,评价了地表稳定性状况和施工的合理性,表明麻栗场隧道地表下沉值大部分发生在上台阶开挖后下台阶开挖前,且沉降槽并不沿中线对称分布;测点离拱顶轴线越远,下沉值越小。通过分析沉降速率对隧道塌方进行了较为准确的预测,为麻栗场隧道安全进洞提供了保障。
Using the combination of on-site monitoring and test and mathematical statistics, the deformation monitoring of the entrance and exit of the tunnel was systematically studied. Deformation monitoring and analysis of the surface of the cave site to evaluate the stability of the surface conditions and the construction of the rationality that the Ma Li field tunnel subsidence most of the value occurred in the excavation of the stairs after the next step before excavation and the trough is not along The center line is symmetrical; the farther the measuring point is from the vault axis, the smaller the subsidence value. Through the analysis of settlement rate, the tunnel collapse is predicted more accurately, which ensures the safe tunneling of Ma Li field tunnel.