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在城市地区修建地铁隧道,由于复杂的周边环境所限,隧道线路往往侧穿甚至下穿周边建筑物。采用浅埋暗挖法施工隧道不可避免地扰动周边地层,引起地层位移与邻近建筑物的沉降、倾斜、甚至裂缝,从而影响建筑物的安全和正常使用。以北京地铁10号线二期区间隧道浅埋暗挖近距离下穿大从大厦工程为例,介绍了此复杂下穿工程的施工技术方案措施,并通过三维有限元模拟了不同加固方案下隧道下穿建筑物引起的地层位移效应,为本工程的顺利实施提供了重要的参考价值。研究成果可为类似地层条件下隧道下穿建筑物工程提供一定的借鉴和参考。
Subway tunnels are built in urban areas and the tunnel lines are often worn sideways or even below the surrounding buildings due to the complexity of the surrounding environment. Using shallow buried tunnel construction tunnel inevitably disturb the surrounding strata, causing the formation displacement and adjacent buildings settlement, tilt, and even cracks, thus affecting the safety and normal use of the building. This paper introduces the construction technology scheme and measures for this complicated under-penetrating project with the example of Shallow-depth undercutting tunneling of Xiaoguan Subway Line 10 of Beijing Subway Line 10 at Xiandai Daxong Building. The tunnels under different reinforcement schemes are simulated by 3D finite element method The effect of formation displacements caused by under-penetrating buildings provides an important reference value for the smooth implementation of this project. The research results can provide some reference and reference for the construction of tunnel under the tunnel under similar stratum conditions.