浅埋超大跨多导洞拱盖法地铁区间导洞施工方案优化研究
高晓刚1尹学鑫1崔凯1舒文韬2马龙祥2
Optimization of Pilot Tunnel Construction Scheme for Shallowburied Superlargespan Metro Interval by Multi Guidinghole Archcover Method
GAO XiaogangYIN XuexinCUI KaiSHU WentaoMA Longxiang
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作者信息:1.中铁三局集团广东建设工程有限公司， 510510， 广州
2.西南交通大学土木工程学院， 610031，成都
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Affiliation:China Railway Third Bureau Group Guangdong Construction Engineering Co., Ltd., 510510, Guangzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2023.08.011
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中图分类号/CLCN:U455.4
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栏目/Col:研究报告
摘要:
目的：为了保障施工安全，有效控制地层变形，对浅埋超大跨多导洞拱盖法地铁隧道修建过程中的合理导洞施工方案进行了研究。方法：采用数值模拟结合正交试验分析的方法，研究了导洞施工顺序、施工错距及施工进尺对隧道围岩体系受力与变形特征的影响，在兼顾对施工周边环境影响小以及满足围岩支护系统受力安全要求的条件下，优化了导洞施工方案。结果及结论：与传统开挖方式相比，“先边后中”和“非对称开挖”的导洞施工原则更有利于施工风险管控和围岩位移控制；在上软下硬地质条件下，影响超大跨多导洞拱盖法导洞施工力学效应的施工参数，按影响显著性由大至小依次为施工进尺、施工顺序及施工错距。
Abstracts:
Objective: To ensure construction safety and effectively control ground deformation, the reasonable pilot tunnel construction scheme for the shallowburied superlargespan metro tunnel excavation by multi guidinghole archcover method is studied. Method: By employing the method of numerical simulation combined with orthogonal experimental analysis, the effects of pilot tunnel excavation sequence, construction stagger and construction advance on the stress and deformation characteristics of the tunnelsurrounding rock system are investigated. Under the premises of accommodating the requirements of minimal impact on the surrounding construction environment and fulfilling the safety requirements of surrounding rocksupporting structure system under stress, the pilot tunnel excavation scheme is optimized. Result & Conclusion: Compared to conventional excavation methods, the ′sidefirst, middlelater′ and ′asymmetric excavation′ principles for guidinghole construction are more favorable for construction risk control and surrounding rock displacement control. Under the uppersoft lowerhard stratigraphical conditions, the construction parameters that significantly affect the mechanical effects of superlargespan tunnel by multi guidinghole archcover method are ranked in order of descending significance as follows: construction advance, excavation sequence, and construction stagger.
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