高地应力区隧洞稳定性的数值仿真分析

Numerical Simulation Analysis of Tunnel's Stability Under High In-situ Stress

结合具体工程实例对高地应力地区隧洞的稳定性以及支护系统进行模拟施工过程的有限元仿真分析。分析结果表明,高地应力地区中喷层最易遭到破坏;隧洞围岩与支护结构的受力与变形的最大特征为沿大主应力方向围岩应力释放最多、位移最大、沿小主应力方向围岩应力集中程度最高,两个方向均为围岩的最薄弱位置,最后提出要进行及时有效的支护、增长锚杆和对全洞除底板外喷钢纤维混凝土的建议,对其它类似工程有丰富的借鉴意义。

Combined with a special engineering project, numerical simulation analysis of tunnel's stability under high in-situ stress is done. The results reveal that shotcrete layer is easist to be destroyed; that the most obvious character of the rock and supporting system's stress and deformation is that the release count of rock's stress is most the displacement is biggest along the major principal stress's direction, the degree of rock's stress focusing is highest along the minor principal stress's direction; that the rocks along both directions are weakest. Finally the suggestions are brought forward that the supporting should be done timely and effectively, the length of bolt should be added, and the steel-fibre shotcrete should be done in the whole tunnel except the bottom.