洞柱法施工的三柱四跨地铁站导洞施工顺序对地面沉降的影响
胡赛鸿
Study on influence of construction sequence of Pile-Beam-Arch station pilot tunnels on surface settlement
HU Saihong
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作者信息:长沙市城市建设投资开发集团有限公司，410015，长沙
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Affiliation:Changsha Urban Construction Investment and Development Group Co., Ltd., 410015, Changsha， China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.06.030
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中图分类号/CLCN:U455.41∶U231.4; TU433
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栏目/Col:研究报告
摘要:
［目的］洞桩法车站施工时地面沉降受导洞施工顺序影响较大，为了有效控制地面沉降，需要研究导洞施工顺序的影响规律。［方法］以田村站为工程背景，建立了三柱四跨洞柱法车站导洞施工三维模型，得出了合理的导洞开挖顺序。基于此，为了缩短工期提出了导洞错距同步开挖的施工方法，并结合现场实测数据研究了该施工方法对地面沉降的控制效果。［结果及结论］先开挖下层导洞引起的地面沉降更小；当导洞相距较近时，同步开挖会产生群洞效应，实际施工中为了有效控制地面沉降，应采用单独开挖或者错距开挖的方式；导洞错距同步开挖施工方法对地面沉降控制效果较好，且显著缩短了工期。
Abstracts:
［Objective］ During construction of PBA(pile-beam-arch) method stations, land subsidence is greatly affected by the guiding hole excavation sequence. In order to effectively control land subsidence, it is necessary to study the influence law of the guiding hole construction sequence. ［Method］ Based on the engineering background of Tiancun Station, a three-dimensional guiding hole construction model for the tunnel of 3-pillar 4-span PBA method station is established, and a reasonable guiding hole excavation sequence is obtained. Based on the above result, in order to shorten the construction period, a staggered synchronous excavation method for the guiding hole construction is proposed, and its effect on land subsidence control is studied based on the on-site measured data.［Result & Conclusion］ The land subsidence is smaller when the lower layer guiding hole is excavated first.When the guiding holes are close to each other, simultaneous excavation will produce group hole effect.In order to effectively control land subsidence in actual construction, separate excavation or staggered excavation should be used.The staggered synchronous excavation method for guiding hole construction has a good effect on land subsidence control, and significantly shortens the construction period. The above method can provide a reference for the similar large-span tunnel station construction.
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