Ⅳ级围岩隧道两台阶法开挖进尺研究
发布时间：2018-08-17 10:36
【摘要】：以吉图珲高铁富岩1号隧道为工程实例,运用有限元分析方法对不同开挖循环进尺下的隧道两台阶法进行数值模拟,对比分析不同工况下隧道变形和应力的响应规律,得出工程适用的开挖循环进尺。研究结果表明:开挖进尺对围岩变形影响较大,两者呈线性正相关关系;在Ⅳ级较差围岩条件下,拱顶受拉破坏先于拱腰和掌子面的受剪破坏,拱顶掌子面后方1 m处第一主应力达到最大值;随着开挖进尺的增大,拱顶第一主应力和拱腰、掌子面处D-P值均增大,隧道更易发生破坏;Ⅳ级较差围岩,开挖进尺建议取2.0 m,Ⅳ级偏好围岩开挖进尺可增大至4 m。
[Abstract]:Taking the Jituhui High Speed Railway Fuyan No.1 Tunnel as an engineering example, the finite element analysis method is used to simulate the tunnel with two step methods under different excavation cycles, and the response laws of tunnel deformation and stress under different working conditions are compared and analyzed. The engineering applicable excavation cycle ruler is obtained. The results show that the excavation advance has a great influence on the deformation of surrounding rock, and the relationship between them is linear and positive, and under the condition of grade 鈪，
本文编号：2187338
[Abstract]:Taking the Jituhui High Speed Railway Fuyan No.1 Tunnel as an engineering example, the finite element analysis method is used to simulate the tunnel with two step methods under different excavation cycles, and the response laws of tunnel deformation and stress under different working conditions are compared and analyzed. The engineering applicable excavation cycle ruler is obtained. The results show that the excavation advance has a great influence on the deformation of surrounding rock, and the relationship between them is linear and positive, and under the condition of grade 鈪，
本文编号：2187338
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