基于小半径曲线隧道盾构施工的Peck公式修正及其工程应用
杨令航
Peck Formula Modification of and Engineering Application in Small Radius Curve Shield Tunneling Construction
YANG Linghang
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作者信息:中铁十四局集团隧道工程有限公司， 250013， 济南
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Affiliation:Tunnel Engineering Co., Ltd., China Railway 14th Bureau Group, 250013, 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.2024.04.008
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中图分类号/CLCN:U455.43
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栏目/Col:学术专论
摘要:
［目的］在城市轨道交通线路规划中，因受建筑物地基、地下管道和软弱土层等因素影响，通常会选用曲线隧道乃至小半径曲线隧道。与直线隧道相比，小半径曲线隧道盾构施工加大了地面沉降失控风险。因此，需对小半径曲线隧道盾构施工中地面沉降控制进行研究。［方法］通过计算曲线隧道盾构施工过程中的超挖间隙，推导出曲线段内每一环的超挖量；又通过引入地层损失率得出隧道半径与地层损失率的关系；根据现有Peck公式的适用性统计分析结果，结合基础地层损失率、总地层损失率、超挖导致额外地层损失率，以及沉降体积切片计算得出了适用于小半径曲线隧道盾构施工的修正Peck公式。以太原某地铁线路的工程实例为研究背景，将修正Peck公式计算结果与现场监测数据进行对比，验证了修正Peck公式的适用性。［结果及结论］工程实例验证结果表明，修正Peck公式对小半径曲线隧道盾构施工具有较好的适用性。
Abstracts:
［Objective］ In the urban rail transit line planning, curved tunnels, and even small radius curved tunnels are often chosen due to influencing factors such as building foundations, underground pipelines, and weak soil layers. Compared to straight tunnels, the shield tunneling construction in small radius curved tunnels increases uncontrolled land subsidence risk. Therefore, it is necessary to study land subsidence control in shield tunneling construction on small radius curved tunnels. ［Method］ By calculating the over-excavation gap during curved tunnel shield tunneling construction, the over-excavation quantity for each ring within the curved section is derived. Furthermore, the relationship between tunnel radius and formation loss rate is obtained by introducing formation loss rate. Based on the applicability statistical analysis of existing Peck formula, a modified Peck formula suitable for shield tunneling construction in small radius curved tunnels is derived considering the base formation loss rate, total formation loss rate, additional formation loss rate due to over-excavation, and the calculation of settlement volume slices. Using an engineering of a metro line in Taiyuan as research background, the results of the modified Peck formula calculation are compared with the on-site monitoring data to validate its applicability. ［Result & Conclusion］ The verification results from the case study demonstrate that the modified Peck formula is applicable for shield tunneling construction on small radius curved tunnels.
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