成都地铁基坑围护桩大变形原因分析及对策研究
李雪1耿凤娟2赵卫星3李方利3蒋媛4
Cause Analysis and Countermeasure Study on Significant Deformation of Chengdu Metro Foundation pit Retaining Piles
LI Xue1GENG Fengjuan2ZHAO Weixing3LI Fangli3JIANG Yuan4
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作者信息:1.西南石油大学地球科学与技术学院， 610500， 成都
2.中国航空集团建设开发有限公司， 101300， 北京
3.中国铁建昆仑投资集团有限公司， 610041， 成都
4.中国电建集团成都勘测设计研究院有限公司, 610072， 成都
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Affiliation:1.School of Geoscience and Technology, Southwest Petroleum University, 610500, Chengdu, China
2.China Aviation Corporation Construction and Development Co., Ltd., 101300, Beijing, China
3.China Railway Construction Kunlun Investment Group Co., Ltd., 610041, Chengdu, China
4.PowerChina Chengdu Engineering Corporation Limited, 610072, Chengdu, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.01.010
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中图分类号/CLCN:TU94+2； TU433
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栏目/Col:研究报告
摘要:
［目的］周边环境及地质条件复杂的地铁基坑施工稍有不慎易导致基坑事故的发生。需分析基坑围护桩大变形原因，并提出针对性加固措施。［方法］以成都某近接老旧建筑物的桩锚支护结构地铁车站基坑为工程背景，分析了基坑施工过程中围护桩体发生大变形的原因，提出控制围护桩变形的加固措施。通过Harding-soil二阶高级本构模型研究了围护桩发生变形后，坑内采用反压堆载、基坑坑外坡体采用钢管桩及再次开挖前加强两道锚索措施的可行性。［结果及结论］模拟计算结果及现场实测结果表明，围护桩累计位移为77.77 mm；围护桩产生大变形后采用加固措施，可将围护桩水平位移控制在53 mm以内；根据模拟计算结果及现场实测结果，二者桩体水平位移曲线变化规律一致。实际施工结果表明，采取加固措施后，基坑变形控制效果明显，后续施工过程中未发生大范围变形。
Abstracts:
［Objective］ The complex environmental and geological conditions surrounding metro foundation pit construction can easily lead to accidents. It is necessary to analyze the reasons for significant deformation of foundation pit retaining piles and propose targeted reinforcement measures. ［Method］ Taking a metro station foundation pit of pile-anchor supporting structure adjacent to old buildings in Chengdu as engineering background, the causes of significant deformation of the retaining piles during foundation pit construction are analyzed and reinforcement measures to control pile deformation are proposed. Using the Harding-soil second-order advanced constitutive model, the feasibility of following measures after retaining pile deformation such as counter-pressure surcharge within the pit, steel pipe piles for the outer slope of the pit, and reinforcement with two additional anchor cables before re-excavation are studied. ［Result & Conclusion］ Simulation results and field measurements indicate that the accumulated displacement of the retaining piles is 77.77 mm. After implementing reinforcement measures following significant deformation, the horizontal displacement of the retaining piles can be controlled within 53 mm. The consistency between the simulated and field-measured results of the pile horizontal displacement curve change law is evident. Actual construction results demonstrate that the deformation control effect of the foundation pit is significant after adopting reinforcement measures, with no widespread deformation occurring in subsequent construction processes.
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