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根据某隧道穿煤段(C2煤层)工程实例,结合围岩位移、围岩内位形、锚杆轴力和钢拱架压力等现场监测分析了隧道穿过煤段围岩-支护结构变形特征,研究结果表明:围岩位移变形分急剧增长阶段、缓慢增长阶段和趋于稳定阶段三个阶段;受高应力与岩体结构影响,拱顶下沉为水平收敛的3倍,初期下沉快,下沉时间长;围岩浅部较深部变形快、大,且松动圈为2.5～3.0m;这为深埋隧道穿越煤段设计和施工提供了重要科学依据。
According to the engineering example of a tunnel coal seam (C2 coal seam), the on-site monitoring of displacement of surrounding rock, surrounding rock, axial force of steel bolt and pressure of steel arch was used to analyze the deformation of the surrounding rock and support structure The results show that the displacement deformation of the surrounding rock is in three stages: the rapid growth stage, the slow growth stage and the stabilization stage. Under the influence of high stress and rock mass structure, the dome sinking is three times of the horizontal convergence, and the initial sinking Fast and sinking for a long time. The deformation of the shallow part of the surrounding rock is fast and large, and the loose ring is 2.5-3.0 m. This provides an important scientific basis for the design and construction of the deep tunnel crossing the coal section.