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北京崇文门路口地区多条地下管线计划进行改移。电力隧道5号检查井与地铁5号线崇文门站西南出入口净距0.995m,6号检查井距5号线车站东南出入口净距3.898m,属近接施工,必然会对出入口结构产生影响,因此电力隧道施工对出入口结构影响的大小需进行安全评估。采用三维实体模型模拟施工,分析5#检查井和电力隧道开挖引起的空间沉降效应,确保电力隧道开挖过程中出入口结构的安全。通过分析三维模型计算结果,进行位移分析和内力分析。位移分析主要依据电力隧道开挖时,结构产生的沉降量和沉降差,通过其与允许值比较,定量判断结构安全性,并给出控制标准和维护建议。
Beijing Chongwenmen junction area multiple underground pipeline plan to shift. There is a clear distance of 0.995m to the southwest entrance of Chongwenmen Station on No.5 line of Power Tunnel and the checkout well of No. 6 from the southeast exit of No.5 line at a distance of 3.898m. It is a short-distance construction and will inevitably affect the structure of entrances and exits. Therefore, The impact of power tunnel construction on the structure of entrances and exits needs to be assessed on safety. The three-dimensional solid model is used to simulate the construction, and the space settlement effect caused by the excavation of the 5 # inspection well and the power tunnel is analyzed to ensure the safety of the structure of the entrance and exit during the power tunnel excavation. By analyzing the three-dimensional model calculation results, displacement analysis and internal force analysis. Displacement analysis is mainly based on the settlement and settlement difference caused by the structure during power tunnel excavation. The safety of the structure is quantitatively judged by comparison with the allowable value, and the control standards and maintenance suggestions are given.