长距离上叠并行的基坑开挖对既有下卧隧道的施工影响与变形控制
杜红劲1段罗2杨革2徐前卫3崔越榜3
Construction Influence of Longdistance Parallel Overspanning Foundation Pit Excavation on Existing Underlying Tunnel and Deformation Control
DU HongjinDUAN LuoYANG GeXU QianweiCUI Yuebang
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作者信息:1.深圳市市政工程质量安全监督总站， 518034， 深圳
2.中铁二局第五工程有限公司， 610073， 成都
3.同济大学道路与交通工程教育部重点实验室， 201804， 上海
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Affiliation:Shenzhen Municipal Engineering Quality and Safety Supervision Station, 518034, Shenzhen, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.07.028
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中图分类号/CLCN:U433
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栏目/Col:施工技术
摘要:
目的：上叠并行的基坑合理加固和开挖是保证基坑稳定和下卧的既有隧道位移控制的关键。合理选择基坑开挖施工方案，可以有效控制既有隧道变形并保障施工中基坑的安全稳定。方法：依托深圳岗厦北枢纽南区基坑工程实例，采用有限元数值模拟的方法对施工过程进行模拟，分析了不同降水深度和不同加固范围条件下的基坑开挖方案对既有下卧隧道变形规律的影响；根据对下卧隧道变形控制效果的分析，对施工方案进行比选，优选了合理的施工方案；最后经现场实测数据加以验证。结果及结论：研究结果表明：长距离上叠并行的上方基坑开挖易引起既有下卧隧道产生较大竖向位移；现场监测结果与对应的数值模拟结果较为一致，推荐的降水至隧道底部及坑底以下抽条加固的方案可有效控制既有下卧隧道的位移。
Abstracts:
Objective: Reasonable reinforcement and excavation of paralle overspanning upper foundation pit are key to ensuring foundation pit stability and controlling existing underlying tunnel displacement. Construction scheme for foundation pit excavation should be reasonably selected for effectively controlling existing tunnel deformation and ensuring foundation pit safety and stability throughout construction. Method: Based on the foundation pit engineering practical case of Gangxia North Hub South Area in Shenzhen, finite element numerical simulation method is used to simulate the construction process, the impact of different foundation pit excavation schemes under different dewatering depths and reinforcement range conditions on the deformation law of the existing underlying tunnel is analyzed. According to the analysis of the underlying tunnel deformation control effect, the construction plans were compared and selected，and a reasonable construction scheme is selected and finally verified by fieldmeasured data. Result & Conclusion: Research results show that excavation of the longdistance parallel overspanning upper foundation pit is prone to cause a large vertical displacement of the existing underlying tunnel; the fieldmonitored results are in good agreement with the corresponding numerical simulation results, and the recommended scheme of dewatering to tunnel bottom and strip reinforcement below the pit bottom can effectively control the displacement of the existing underlying tunnel.
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