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隧道施工中,预留变形量的合理确定能较准确的预计开挖轮廓,既可确保围岩充分变形而减小围岩压力,又可避免侵限的情况发生,对于隧道的设计和施工有重要影响。本文对台阶法施工下隧道的预留变形量的主要影响因素进行了分析和探讨,并通过现场实测与数值模拟相结合,结果表明,台阶法开挖中下台阶开挖引起的变形是围岩总变形的重要组成部分,可以达到总变形量的50%左右。确定预留变形量时必须充分重视下台阶开挖引起的变形。此工作可为今后类似的工程的实施提供一定的借鉴与参考。
In the tunnel construction, the reasonable determination of the amount of deformation reserved can predict the excavation profile more accurately, which can not only ensure the deformation of the surrounding rock but also reduce the pressure of the surrounding rock and prevent the occurrence of intrusion. For the design and construction of the tunnel Significant influence. In this paper, the main influencing factors of the reserved deformation of the tunnel under the step method are analyzed and discussed. Through the combination of field measurements and numerical simulation, the results show that the deformation induced by the step-down excavation is the surrounding rock The total deformation of an important part of the total deformation can reach about 50%. Determine the amount of deformation reserved must pay full attention to the deformation caused by the next step. This work can provide some reference and reference for the implementation of similar projects in the future.