公路隧道穿越风化凹槽段施工分析

以潮汕环线高速公路西环山一号隧道右线风化凹槽段工程为依托,基于有限差分数值模拟软件构建了隧道施工动态三维模型,对比分析了风化凹槽段进行掌子面开挖时,均质围岩及夹风化残积层岩状下围岩变形特征和应力变化规律.结果表明:两种岩状下,地表竖向位移最大值均发生在隧道中线上部,但中线两侧位移变化规律出现反差,水平位移最大值发生在中...

Construction Analysis of Highway Tunnel Passing through Weathered Groove Section

Based on the weathered groove section project of right line of Xihuanshan No.1 Tunnel of Chaoshan Ring Line Highway, constructs the construction dynamic 3D model of the tunnel based on the finite difference fractional value simulation software, compares and analyzes the deformation characteristics and stress change rules of the surrounding rock under the homogeneous rocks and inclusive weathered eluvial rocks when the tunnel face is excavated at the weathered groove section. The results show that: under the two rock formations, the maximum vertical displacement of the ground surface occurred in the upper part of the middle line of the tunnel, but with a contrast between the displacement variation law on both sides of the middle line; the maximum horizontal displacement occurred on the upper part of the middle dyke, with a "point of inflection" of the displacement on the right boundary of the weathered interlayer; each monitored part of the excavation section shares the same settlement and deformation law, and under the inclusive weathered eluvial rocks, the vertical stress is significantly different on both sides of the middle line of the tunnel, among which the stress on the right haunch, side walls and arch springing is obviously smaller than those on the left; a "point of inflection" occurred at the horizontal displacements of the middle dyke, which transits from the homogeneous rock to the inclusive weathered eluvial rock; the corresponding height of "point of inflection" decreases, and the positive displacement area of the middle dyke develops from the upper to the middle and gradually expands; the cumulative settlement of the arch apex increases gradually, and the cumulative settlement difference increases with the increase of excavation footage.