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基于赣龙铁路梅花山隧道围岩应力以及围岩岩体模量实测结果,对隧道围岩应力分布特征、围岩模量的分布特征、围岩应力集中区向深部转移特性以及开挖方式对围岩松弛区影响进行分析。研究结果表明:(1)梅花山隧道是以构造应力为主的高地应力区;(2)围岩的应力集中区向深部发生了转移,水平孔应力集中区范围为5.9~11.9 m,铅直孔应力集中区范围为7.9~15.9 m。围岩应力集中区向深部转移后,其应力集中度大为降低,水平孔最大主应力集中度为1.87倍,铅直孔最大主应力集中度为1.23倍。(3)采用光面爆破隧道壁松弛范围为0~5 m,底板没有采用光面爆破松弛范围为0.0~7.2 m。松弛区相同深度水平孔岩体模量值及应力值均比铅直孔岩体模量值及应力值大。应力峰值的转移,改变了围岩应力场分布规律,为隧道支护提供一种思路和方法,具有很好的工程应用价值。
Based on the stress of surrounding rock and the measurement results of surrounding rock mass modulus, the stress distribution characteristics of the surrounding rock mass, the distribution characteristics of the surrounding rock modulus, the stress transfer from the surrounding rock to the deep and the mode of excavation Analysis of the impact of the surrounding rock relaxation area. The results show that: (1) The Meihuashan Tunnel is a high stress area dominated by tectonic stress; (2) the stress concentration area of the surrounding rock is transferred to the deep part; the horizontal hole stress concentration range is 5.9 ~ 11.9 m, Hole stress concentration range of 7.9 ~ 15.9 m. The stress concentration of the surrounding rock stress concentration area is greatly reduced, the maximum principal stress concentration of horizontal hole is 1.87 times and the maximum principal stress concentration of vertical hole is 1.23 times. (3) The smooth relaxation range of the tunnel wall is 0 ~ 5 m with smooth blasting, and the relaxation range of the smooth blasting floor is 0.0 ~ 7.2 m. The modulus and stress of the horizontal hole in the same depth of slack zone are larger than the modulus and stress of the vertical hole. The transfer of stress peak changes the distribution rule of surrounding rock stress field and provides a kind of train of thought and method for tunnel support with good engineering application value.