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针对黄土地区大面积基坑开挖与高层建筑施工对下卧地铁隧道的不利影响,对基坑开挖与高层建筑施工进行了模拟分析,研究表明,大面积基坑开挖引起下卧隧道的隆起变形与内力变化均在可控范围之内,地铁隧道与上部建筑“结构分离”的设计思路是安全可行的,建筑物荷载能够通过转换梁与桩基础形成的转换机制有效地传递到隧道下方的地层深处,同时扩散至隧道的附加荷载在一定程度上是有利的;基坑开挖应遵循先两边后中间的开挖步序,尽量减少基坑中部区域地层应力的释放与坑底隆起,同时还应采取措施尽量减少基坑开挖初始阶段引起的地层扰动。研究结论对后续类似工程具有重要的借鉴意义与参考价值。
In view of the adverse effects of large area foundation pit excavation and high-rise building construction on the submarine subway tunnel in the loess area, the excavation and high-rise building construction are simulated and analyzed. The results show that the excavation of a large area pit Uplift deformation and internal force changes are within the controllable range, the subway tunnel and the superstructure “structural separation ” design concept is safe and feasible, the building load can be transferred through the transfer beam and the pile foundation conversion mechanism effectively transmitted to The depth of the formation below the tunnel and the additional load diffused to the tunnel are favorable to a certain extent. The excavation of foundation pit should follow the excavation sequence of the first two sides and the middle of the excavation, and the stress release should be minimized in the middle of the foundation pit At the same time, measures should be taken to minimize the disturbance caused by the formation during the initial excavation of the foundation pit. The conclusions of the study have important reference and reference value for subsequent similar projects.