温州软土地层盾构隧道基于长期沉降控制的地基加固方案分析
苟长飞1谢波涛2,3
Analysis of Foundation Reinforcement Schemes for Shield Tunnels in Wenzhou Soft Soil Strata Based on Long-term Settlement Control
GOU Changfei1XIE Botao2,3
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作者信息:1.温州市铁路与轨道交通投资集团有限公司， 325029， 温州
2.温州大学建筑工程学院, 325035， 温州
3.浙江省软弱土地基与海涂围垦工程技术重点实验室, 325035， 温州
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Affiliation:1.Wenzhou Mass Transit Railway Investment Group Co., Ltd., 325029, Wenzhou, China
2.College of Civil Engineering and Architecture, Wenzhou University, 325035, Wenzhou, China
3.Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation of Zhejiang Province, 325035, Wenzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.05.016
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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］软土地区盾构隧道投入运营后，因各种原因引起的长期隧道沉降对轨道交通的运营安全造成了一定的影响。列车荷载是引起软土地区盾构隧道长期沉降的重要原因之一，因此有必要研究盾构隧道地基加固方案。［方法］对比分析了采用注浆、水泥搅拌桩、高压旋喷等地面预加固法，以及洞内注浆加固法的加固效果、适用地层、工程实施难易程度、加固范围及加固费用。以温州轨道交通S2线瓯江北口隧道的地基加固方案为例，采用数值模拟方法分析了软土盾构隧道采用不同地基加固方案时，车辆荷载引起的基底土体附加应力，并通过应力分析研究了隧底加固宽度和加固深度对加固效果的影响规律，进而确定了瓯江北口隧道的加固方案。通过现场沉降监测数据，验证了加固方案的有效性。［结果及结论］对盾构隧道底部软土进行加固后，车辆荷载引起的附加应力在加固区产生了应力集中(增大)现象，在非加固区产生了应力扩散(减小)现象。加固宽度对附加应力集中或扩散效应影响不显著，加固深度对隧道沉降影响显著，当加固深度超过一定限值后，对隧道沉降的控制效果不再显著。
Abstracts:
［Objective］After the shield tunnels in soft soil areas are put into operation, long-term settlement of the tunnel caused by various factors poses a threat on the safety of rail transit operation. Train load is one of the important causes for the long-term settlement of shield tunnels in soft soil areas. Therefore, it is necessary to study the foundation reinforcement schemes for shield tunnels.［Method］A comparative analysis is carried out on the reinforcement effects, applicable strata, difficulty levels of engineering implementation, reinforcement scopes, and reinforcement costs of the ground pre-reinforcement methods such as grouting, cement mixing piles, high -pressure jet grouting, and the in-tunnel grouting reinforcement method. Taking the foundation reinforcement scheme for the Oujiang North Estuary Tunnel of Wenzhou Rail Transit Line S2 as an example, the numerical simulation method is used to analyze the additional stress of the foundation soil caused by train loads when different foundation reinforcement schemes are adopted for the shield tunnels in soft soil areas. Through stress analysis, the influence patterns of the reinforcement width and depth at the tunnel bottom on the reinforcement effect are studied, thereby the reinforcement scheme for the Oujiang North Estuary Tunnel is determined.. Then, the effectiveness of the reinforcement scheme is verified through on-site settlement monitoring data.［Result & Conclusion］After the soft soil at the bottom of the shield tunnel is reinforced, the additional stress caused by train loads shows a stress concentration (increase) phenomenon in the reinforced area and a stress diffusion (decrease) phenomenon in the non-reinforced area. The reinforcement width has an insignificant impact on the stress concentration or diffusion effect, while the reinforcement depth has a significant impact on tunnel settlement. When the reinforcement depth exceeds a certain limit, the control effect on tunnel settlement is no longer significant.
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