RESEARCH ON THE STABILITY OF UNDERCROSSED SUBWAY SHIELD TUNNEL
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摘要: 以在建地铁隧道下穿既有工程为研究对象,对既有车行隧道结构变形以及地层土体变形影响情况进行综合分析并提出新建盾构隧道合理的掘进方案。主要研究工作:以广州地铁21号线黄村站—世界大观站盾构区间下穿既有车行隧道案例为依托,利用有限元软件和有限差分软件分别进行数值建模和计算分析,制定左右线新建隧道不同错距的掘进方案,研究左右线新建盾构掘进面错距大小对其下穿既有车行隧道的变形影响,得到合理的施工错距范围。Abstract: Based on the Guangzhou subway undercrossing structure, the structural deformation of the existing vehicular tunnel and the soil deformation were comprehensively analyzed, and an appropriate plan about the newly-built tunnel was proposed. The main contents of research are as follows:choosing the Guangzhou's 21th huangcun station-world grand station undercrossing the existing vehicular tunnel project used as a research object, a 3D finite element numerical model was established, and discrete element software was used for numerical calculation. The tunneling schemes for the new tunnel with different excavation stagger distance on the left and right lines were proposed, and its effect on the deformation of the tunnel undercrossing the existing vehicular tunnel was studied, so as to obtain an appropriate stagger distance range.
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Key words:
- shield tunnel /
- numerical simulation /
- adjacent construction /
- ground surface settlement
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