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中文摘要：
交叉隧道盾构施工及其与周围环境的相互影响已成为地下工程研究中的前沿课题之一。城市地铁隧道掘进会引起邻近建筑物的变形,甚至造成灾害。随着城市交叉隧道邻近建筑物施工的现象明显增多,如何确保上部建筑物与隧道结构的安全成为施工中的难题。采用三维有限元方法,对邻近不同位置建筑物工况下的新建隧道盾构下穿既有隧道施工进行了模拟和分析。研究表明,忽略邻近建筑物的存在将低估交叉隧道盾构下穿施工的影响;建筑物与交叉隧道盾构之间的相互影响存在一定范围,当新建隧道轴线与建筑物中心线的水平距离与隧道外径之比L/D=0~2时,交叉隧道盾构施工对建筑物的影响较大,特别是当L/D=1.5时,建筑物处于危险状态;L/D=0~3时,建筑物的存在会增大新、旧隧道的内力和变形,在该区域以外对隧道影响较小。研究成果对交叉隧道的安全施工有一定的指导意义。
英文摘要：
The influence of undercrossing shield tunneling and its interaction with surrounding environment is one of the hot issues in the underground engineering field.The urban tunnel construction will cause the deformation or even damage of the nearby buildings.With the construction of undercrossing tunnels,more and more undercrossing tunnels are adjacent buildings.It is a crucial problem to ensure the safety for stabilizing the superstructure and undercrossing tunnels.By means of 3D-FEM,the undercrossing shield tunneling construction of adjacent structures is simulated and studied.The results show that the influence of adjacent structure on the undercrossing shield tunneling construction cannot be neglected,and the influence scope can be expressed by L/D,which L is defined as level distance from the new tunnel axis to building axis and D is defined as outer diameter of tunnel.When L/D =0 to 2,undercrossing shield tunnel construction has great influence on building,especially,the building is in danger when L/D =1.5.When L/D =0 to 3,the value of the existing tunnel deformation and the new tunnel lining force increases obviously.Out of the region,the influence on the buildings is ignored.
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