摘要
为分析桥梁施工对临近隧道的影响程度,文中以某既有临近隧道旁的桥梁施工为工程背景,利用midas GTS NX有限元软件分析桥梁施工对隧道结构的影响,得到隧道衬砌结构的位移及内力结果.结果表明,在桥梁桩基钻孔开挖过程中,由于桩孔土体被掏空,围岩应力释放,使轨道交通隧道左、右洞分别产生了1.1,3.56 mm的水平位移;桥梁开挖的应力释放发生竖向位移后,在上覆荷载的作用下竖向位移有所减小,呈现出先增大后减小的变化趋势,最终竖向位移分别为0.95,2.56 mm;在桥梁施工过程中,隧道衬砌结构的最大拉应力为916 kPa,最大压应力值为3 133 kPa,最大弯矩为74 kN·m,均满足强度要求,保证了轨道交通隧道的正常运营.
Abstract
In order to analyze the impact of bridge construction on adjacent tunnels,taking the con-struction of a bridge adjacent to an existing tunnel as the engineering background,midas GTS NX fi-nite element software is used to analyze the impact of bridge construction on the tunnel structure.The displacement and internal force results of the tunnel lining structure are obtained.The analysis results indicate that during the drilling and excavation process of the bridge pile foundation,due to the hollo-wing out of the soil in the pile hole,the stress in the surrounding rock is released,resulting in hori-zontal displacement of 1.1 mm and 3.56 mm in the left and right holes of the rail transit tunnel.After the stress release during bridge excavation,the vertical displacement decreases under the action of the overlying load,showing a trend of first increasing and then decreasing.The final vertical displacement is 0.95 mm and 2.56 mm.During bridge construction,the maximum tensile stress of the tunnel lining structure is 916 kPa.The maximum compressive stress value is 3 133 kPa and the maximum bending moment is 74 kN·m,both of which meet the strength requirements and ensure the normal operation of the rail transit tunnel.
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