洞桩法地铁车站横向管幕对地面沉降影响研究
何志伟1魏元津1仝帅龙2吴圣智2
Impact of Lateral Pipe Curtains on Land Subsidence in PBA Metro Station
HE Zhiwei1WEI Yuanjin1TONG Shuailong2WU Shengzhi2
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作者信息:1.中铁十四局集团有限公司， 250014， 济南
2.山东建筑大学土木工程学院， 250101， 济南
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Affiliation:1.China Railway 14th Bureau Group Co., Ltd., 250014, Jinan, China
2.School of Civil Engineering, Shandong Jianzhu University, 250101, Jinan, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.20230638
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中图分类号/CLCN:U231.4
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栏目/Col:土建工程
摘要:
［目的］浅埋地铁车站采用洞桩法施工时易引发显著地层沉降，横向管幕虽施工便捷，但其参数优化对地面沉降控制效果尚不明确，亟待对此进行深入研究。［方法］依托济南地铁R4线奥体中心换乘车站项目，采用数值模拟、现场监测分析了横向管幕作用下其刚度、约束长度及间距对地面沉降的影响规律。［结果及结论］在横向管幕作用下，采用先周边后内部的导洞开挖顺序，地面最终沉降最小；横向管幕刚度越大，地面沉降越小，当横向管幕刚度增大至5倍后，对地面沉降影响不大；横向管幕约束长度的增大对地面沉降具有一定影响，但影响程度不大；横向管幕间距对地面沉降具有较大影响，当横向管幕间距较大时，其承载能力明显降低，对地层的支护作用减弱。
Abstracts:
［Objective］ Shallow-buried metro stations constructed by PBA (pile-beam-arch) method are prone to significant strata settlement. Though lateral pipe curtains are convenient for construction, the optimization of their parameters for controlling land subsidence remains unclear, necessitating further in-depth research.［Method］ Based on Jinan Metro R4 Line Olympic Sports Center Interchange Station project, numerical simulation and field monitoring are employed to analyze the influence of the stiffness, restraint length, and spacing of the lateral pipe curtain on land subsidence.［Result & Conclusion］ Under the influence of lateral pipe curtain, the excavation sequence of surrounding tunnels first then internal tunnels resulted in the minimal final land subsidence. The greater the stiffness of the lateral pipe curtain, the smaller the land subsidence, with little impact on land subsidence when the stiffness increases to five times its original value. Increasing the restraint length of the lateral pipe curtain has a certain effect on land subsidence, though the impact is not significant. The lateral pipe curtain spacing has a more considerable effect on land subsidence; when the lateral pipe curtain spacings are large, their load-bearing capacity decreases significantly, weakening their support role in the strata.
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