盾构隧道管棚法下穿铁路路基变形控制
姜键骏1,2,3邱乾胜3杨全4张月莹4居庆5
Railway Subgrade Deformation Control of Shield Tunnel Underpassing with Pipe Roof Support Method
JIANG Jianjun1,2,3QIU Qiansheng3YANG Quan4ZHANG Yueying4JU Qing5
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作者信息:1.天津大学电气自动化与信息工程学院， 300072， 天津
2.浙江机电职业技术大学智慧交通学院， 310059， 杭州
3.浙江芯能光伏科技股份有限公司， 314400， 嘉兴
4.浙江省机电产品质量检测所有限公司， 310051， 杭州
5.浙江建设职业技术学院工程造价学院， 310059， 杭州
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Affiliation:1.School of Electrical Automation and Information Engineering, Tianjin University, 300072, Tianjin, China
2.School of Intelligent Transportation, Zhejiang Polytechnic University of Mechanical and Electrical Engineering, 310059, Hangzhou, China
3.Zhejiang Xinneng Photovoltaic Technology Co., Ltd.， 314400, Jiaxing, China
4.Zhejiang Testing & Inspection Institute for Mechanical and Electrical Products Quality Co., Ltd., 310051, Hangzhou, China
5.School of Project Cost, Zhejiang College of Construction, 310059, Hangzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.05.021
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中图分类号/CLCN:U455.43
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栏目/Col:土建工程
摘要:
［目的］在近接施工扰动影响下，盾构下穿施工会对路基沉降造成一定影响，管棚在不同环向布置范围及环向间距条件下对路基沉降的控制效果有所不同，因此有必要研究管棚超前支护对上方铁路路基沉降的控制效果。［方法］以成都地铁5号线下穿铁路路基为例，提出双层管棚支护方案，并采用FLAC 3D软件进行数值模拟。根据路基沉降标准，基于隧洞围岩塑性区体积、路基沉降及管片位移3项指标，结合现场监测数据，对管棚在不同环向布置范围及环向间距下的支护效果进行研究。［结果及结论］相比于管棚环向间距，合理布置环向范围更能发挥管棚的支护效果。针对一般地层，当管棚布置形式为拱部环向范围150°、环向间距40 cm时，能够满足管片位移的控制要求。当环向间距为30 cm时，随着管棚环向范围由拱部夹角90°增大至拱部夹角180°，路基沉降最大值则由50.00 mm减小至2.50 mm，小于路基沉降预警值3.75 mm，此时围岩塑性区体积接近于0，且管片位移值较小，路基沉降监测结果满足沉降预警值要求。所确定的最佳管棚布置方案为：环向间距30 cm，拱部夹角180°。
Abstracts:
［Objective］Under the disturbance of adjacent construction, the shield tunneling underpassing construction will have a certain impact on the subgrade settlement. The control effect of the pipe roof on the subgrade settlement varies under different circumferential layout scopes and spacing conditions. Therefore, it is necessary to study the control effect of advanced pipe roof support on the settlement above the railway subgrade. ［Method］In the case study of Chengdu Metro Line 5 underpassing the railway subgrade, a double-layer pipe roof support scheme is proposed, and the FLAC 3D software is used for numerical simulation. According to the subgrade settlement standards, based on the three indexes of the volume of the tunnel surrounding rock plastic zone, the subgrade settlement and the segment displacement , and combined with the on-site monitoring data, the support effect of the pipe roof under different circumferential layout scopes and spacing is studied. ［Result & Conclusion］Compared with the circumferential spacing of the pipe roof, a reasonable arrangement of the circumferential scope can better exert the support effect of the pipe roof. For the general strata, the control requirements of the segment displacement can be met when the pipe roof layout is in a form of 150°arch part circumferential scope and the circumferential spacing is 40 cm. When the circumferential spacing is 30 cm, as the circumferential scope of the pipe roof increases from the arch angle of 90°to 180°, the maximum value of the subgrade settlement decreases from 50.00 mm to 2.50 mm, less than the subgrade settlement warning value of 3.75 mm. At this time, the volume of the plastic zone of the surrounding rock is close to 0 with a smaller segment displacement, and the monitoring result of the subgrade settlement meets the requirements of the settlement warning value. The determined optimal pipe roof layout scheme is that the circumferential spacing is 30 cm, and the arch angle is 180°.
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