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运用FLAC3D建立了某一隧道三维地质模型并进行了分析。隧道开挖后,围岩应力进行了重新分布,拱顶、拱底、两侧边墙出现了应力集中现象,拱顶、拱底竖向位移较大;粘聚力c的大小对塑性区的范围影响很大,而泊松比μ和内摩擦角φ对塑性区范围的影响较小。研究能有效地对隧道开挖过程中围岩的应力、位移、塑性区进行预测,以降低隧道施工风险,确保施工安全。
Using FLAC3D, a tunnel 3D geological model was established and analyzed. After tunnel excavation, the surrounding rock stress is redistributed, and the stress concentration phenomenon occurs on the vault, arch bottom and side wall, and the vertical displacement of vault roof and arch bottom is large. The cohesion c has a great influence on the plastic zone The influence of the range is very large, and the influence of the Poisson’s ratio μ and the internal friction angle φ on the plastic zone is small. The research can effectively predict the stress, displacement and plastic zone of surrounding rock during tunnel excavation so as to reduce the risk of tunnel construction and ensure the construction safety.