【摘要】 二郎山隧道是川藏铁路的控制性重点工程,隧址区的地应力分析对于铁路的选线和施工具有重要意义。本文通过工程类比分析和应力计算确定了边界条件及水平向对称梯度应力,综合应用CAD,ANSYS和FLAC3D三种软件开展了二郎山隧道深埋方案的数值反演,分析了沿隧道轴线的应力变化和分布特征。结果表明:隧址区全长范围内最大主应力总体上随埋深增大而逐渐增加;局部应力状态受地质构造影响较大,在结构面及岩性分界点附近有明显变化。更多还原

【Abstract】 Erlang mountain tunnel is the controlling key project of Sichuan-Tibet railway. Ground stress analysis of the tunnel site area has important significance to the railway route selection and construction. This paper determined the boundary conditions and the horizontal symmetry gradient stress by engineering analogy analysis and ground stress calculation,developed numerical inversion model for deep buried scheme of Erlang mountain tunnel by combining with CAD,ANSYS and FLAC3 D,analyzed stress change and distribution characteristics along the tunnel axis. The results showed that the maximum principle stress gradually increases with the growth of the cover depth in tunnel site area,local stress state is mainly affected by geological structure,which obviously changes nearby the structural plane and lithology boundary point.更多还原