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分析了采用中隔壁法施工时隧道中隔壁的变形特性,研究了中隔壁变形和水平荷载之间的内在关系,提出了一种新的隧道水平围岩压力计算方法。采用结构力学分析理论,建立了中隔壁变形和水平围岩压力之间的关系,利用中隔壁变形监测数据,得到水平围岩压力。基于天恒山土质浅埋隧道Ⅴ级围岩,采用谢家烋法计算的水平围岩压力为88～145kPa,采用新算法计算的水平围岩压力为110kPa。其中,当围岩摩擦角为45°时,采用谢家烋法计算的水平围岩压力为115kPa,与采用新算法计算的水平围岩压力接近,两者相差5kPa,验证了新算法的可行性。
The deformation characteristics of the middle wall of the tunnel when using the middle wall construction method are analyzed. The internal relationship between the deformation of the middle wall wall and the horizontal load is studied. A new method for calculating the pressure of surrounding rock in the tunnel is proposed. Using the theory of structural mechanics analysis, the relationship between the deformation of the middle wall and the pressure of the surrounding rock is established, and the pressure of the surrounding rock is obtained by using the deformation monitoring data of the middle wall. Based on the Grade V surrounding rock of the shallow soil tunnel in Tian Heng Mountain, the horizontal wall rock pressure calculated by Xie’s method is 88 ~ 145kPa, and the horizontal rock pressure calculated by the new algorithm is 110kPa. Among them, when the surrounding rock friction angle is 45 °, the surrounding rock pressure calculated by Xie’s method is 115 kPa, which is close to the pressure of the surrounding rock calculated by the new algorithm. The difference between them is 5 kPa, which verifies the feasibility of the new algorithm.