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通过对进洞口浅埋偏压段隧道施工过程三维数值分析,对隧道开挖过程中的围岩力学行为进行深入研究表明:在隧道开挖过程中,围岩总体处于受压状态,受地形偏压影响,靠近山体侧围岩受力与位移明显大于远离山体侧。因隧道施工过程中采取了合理的预加固及支护措施和施工工法,总体上围岩位移值及塑性区较小,岩体处于稳定状态。同时根据岩体的力学行为特征提出了相应的建议。
Through the three-dimensional numerical analysis of the tunnel construction process of the tunnel with shallow buried bias, the in-depth study on the mechanical behavior of the surrounding rock during the tunnel excavation shows that the surrounding rock is in a state of compression during the excavation of the tunnel. Under pressure, the forces and displacements of the surrounding rock near the side of the mountain are obviously greater than those away from the side of the mountain. Due to the reasonable pre-reinforcement and supporting measures and construction methods adopted in the tunnel construction, the overall displacement and plastic zone of surrounding rock are small, and the rock mass is in a stable state. At the same time, the corresponding suggestions are put forward according to the mechanical behaviors of rock mass.