摘要
随着城市经济的不断发展以及电力需求的持续增长,城市地下变电站和电力隧道的建设形式逐渐普及。地下建筑物建设时序不同所引起的相互影响,是地下工程必须考虑和评估的关键问题。通过三维有限元手段,对某地下变电站包括基坑开挖及主体结构回筑在内的各主要施工阶段进行模拟,分析其对临近既有电力隧道变形的影响,以评估该地下变电站基坑设计方案的合理性。计算结果表明,地下变电站基坑开挖产生的卸载效应会导致临近电力隧道发生一定程度的位移变形。而通过调整地下连续墙的厚度及水平内支撑的布置,分区有序挖土并快速形成内支撑等措施,能够有效减小对临近电力隧道的不利影响,将其变形控制在规定限制以内,为类似的工程提供参考。
With the continuous development of urban economy and the continuous growth of power demand, the construction forms of urban underground substations and power tunnels are becoming popular. The mutual influence caused by the different timing of underground building construction is a key issue that must be considered and evaluated in underground engineering. In this paper, we simulate each major construction phase of an underground substation including pit excavation and main structure back construction by means of 3D finite element analysis, and analyze its influence on the deformation of the adjacent existing power tunnel to evaluate the rationality of the pit design scheme of this underground substation. The calculation results show that the unloading effect of the underground substation pit excavation in this paper will lead to a certain degree of displacement and deformation of the adjacent power tunnel. And by adjusting the thickNess of the underground diaphragm wall and the arrangement of horizontal internal supports,zoning the excavation in an orderly manner and forming internal supports quickly, the adverse effects on the adjacent power tunnel can be effectively reduced and the deformation can be controlled within the specified limits, which can provide reference for similar projects.
作者
华坤
孙岩
胡鹏飞
刘伟亮
吴波
陈轩
HUA Kun;SUN Yan;HU Pengfei;LIU Weiliang;WU Bo;CHEN Xuan(Shanghai Electric Power Design Institute Co.,Ltd.,Shanghai 200001,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S02期2327-2333,共7页
Building Structure
关键词
地下变电站
基坑开挖
临近电力隧道
三维有限元分析
tunderground substation
pit excavation
adjacent power tunnel
3D finite element analysis
