上软下硬地层拱柱法暗挖地铁车站施工变形规律研究
王祥1王顺然2,3刘宪永4宋战平2,3吴昊2
Deformation Law of Metro Station Underground Excavation by Arch Column Method in Upper-Soft and Lower-Hard Strata
WANG Xiang1WANG Shunran2,3LIU Xianyong4SONG Zhanping2,3WU Hao2
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作者信息:1.贵阳市城市轨道交通集团有限公司， 550081， 贵阳
2.西安建筑科技大学土木工程学院， 710055， 西安
3.陕西省岩土与地下空间工程重点实验室， 710055， 西安
4.北京市政路桥股份有限公司， 100045， 北京
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Affiliation:1.Guiyang Urban Rail Transit Group Co., Ltd., 550081, Guiyang, China
2.School of Civil Engineering, Xi’an University of Architecture and Technology, 710055, Xi’an, China
3.Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering, 710055, Xi’an, China
4.Beijing Municipal Road and Bridge Co., Ltd., 100045, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.04.029
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中图分类号/CLCN:TU433； U231.3
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栏目/Col:研究报告
摘要:
［目的］上软下硬地层条件下浅埋地铁车站施工难度较大，易引起地面沉降、车站变形等工程问题。拱柱法作为一种新型工法，其工序相对简单，安全风险较小，施工效率较高。有必要研究上软下硬地层拱柱法暗挖地铁车站施工变形规律。［方法］对施工过程进行数值模拟，计算施工中的地面沉降、隧道水平收敛及拱顶沉降，并与现场实际监测数据进行对比分析。［结果及结论］模拟结果显示，拱柱法施工时车站中线上方地面沉降最大值为13.91 mm；拱部净空收敛最大值为0.66 mm，下部直墙断面净空收敛为1.85 mm；中导洞的拱顶沉降值为0.66 mm，边导洞的拱顶沉降值为0.07 mm。现场监测结果显示，地面沉降最大值为19.75 mm；中导洞净空收敛值为3.25 mm；中导洞的拱顶沉降值为7.07 mm，边导洞拱顶沉降值为3.84 mm。
Abstracts:
［Objective］ The construction of shallow-buried metro station in upper-soft and lower-hard strata is tough, easily leading to engineering issues such as land subsidence and station deformation. As a new construction method, the arch column method features relatively simpler procedures, lower safety risks and higher construction efficiency. It is necessary to study the deformation law of metro station underground excavation by the arch column method in upper-soft and lower-hard strata. ［Method］ The construction process is numerically simulated to calculate land subsidence, tunnel horizontal convergence and vault subsidence during construction, and the data are compared and analyzed with the actual monitoring data onsite. ［Result & Conclusion］ Simulation results show that during arch column method construction, the maximum land subsidence above the station center-line is 13.91 mm; the maximum clearance convergence of the arch is 0.66 mm, and that of the lower straight wall section is 1.85 mm; the vault subsidence of the middle pilot tunnel is 0.66 mm, and that of the side pilot tunnel is 0.07 mm. On-site monitoring results show that the maximum land subsidence is 19.75 mm; the clearance convergence of the middle pilot tunnel is 3.25 mm; the vault subsidence of the middle pilot tunnel is 7.07 mm, and that of the side pilot tunnel is 3.84 mm.
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