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为了探讨小间距隧道围岩的变形稳定性,进行稳定安全的净距设计,基于地下洞室围岩的容许变形规定或规范,以及大量的现场监测信息和变形规律数值模拟结果,利用统计学方法,对围岩为石灰岩和千枚岩的小间距隧道建立了容许变形控制方程,该方程综合考虑了小间距隧道跨度、间距大小、埋深、围岩变形规律及强度特性等影响因素。依据该方程对围岩为石灰岩和千枚岩的小间距隧道工程的稳定安全性进行了检验分析,并与现场实测位移进行了比较分析,其可用于中硬岩和硬岩小间距隧道围岩周边水平容许位移和拱顶垂直容许下沉位移的计算。
In order to investigate the deformation stability of surrounding rock in small spacing tunnels and to design a clear and safe clearance, based on the allowable deformation rules or specifications of surrounding rock in underground caverns, as well as a large number of field monitoring information and numerical results of deformation laws, , A set of allowable deformation control equations are established for small-interval tunnels with limestone and phyllite as surrounding rocks. The equation takes into account the influencing factors such as span, spacing, depth of burial, deformation and strength characteristics of surrounding rock. According to the equation, the stability and safety of the small-interval tunnel with limestone and phyllite surrounding rock are tested and analyzed, and compared with the measured displacements in the field, which can be used in the rock mass of medium- and small- Peripheral horizontal allowable displacement and vault vertical allowable sinking displacement calculation.