软土盾构隧道三轴搅拌桩加固效果及地层变形规律分析

作者：张扬¹,曹雄²’³,陈理堃⁴,谭毅俊⁵

作者简介：

张扬，工程师，E⁃mail:358213820@ qq. c

作者单位：

1.中铁十五局集团有限公司，上海 200070; 2.珠海市规划设计研究院，广东珠海 519000; 3.广东省滨海地区防灾减灾工程技术研究中心，广东珠海 519000; 4.珠海红宝石建设开发集团有限公司，广东珠海 519000;5.深圳大学土木与交通工程学院，广东深圳 518060

基金项目：

∗广东省住房和城乡建设厅科技创新计划（2022⁃K4⁃065552,2022⁃K4⁃231814）；中铁十五局科研项目（CR15CG⁃ZH⁃HQMZSD⁃2021⁃00001（KJ））

摘要：

滨海软土区盾构隧道浅覆土段地层稳定性差，为保障盾构施工安全，需对软土地层进行加固处理。聚焦软土地层盾构隧道三轴搅拌桩加固效果，考虑地层未加固及格栅加固两种工况，通过数值计算对比分析盾构隧道开挖面主动、被动受荷变形和破坏规律以及对地表位移的影响。结果表明：软土盾构隧道浅覆土段经三轴搅拌桩加固后，相同支护压力下开挖面水平位移及地表竖向位移显著减小，变形控制效果显著；格栅加固地层与天然未加固地层的开挖面受荷变形演化过程存在较大差异，主要表现为开挖面水平位移分布、地表竖向位移随支护压力的变化规律以及极限破坏形态的不同。

关键词：隧道；盾构；地基；软土；变形；水泥土搅拌桩

English：

The stability of the shallow overburden soil section of the shield tunnel in the coastal soft soilarea is poor. To ensure the safety of shield construction, it is necessary to reinforce the soft soil layer.Focusing on the reinforcement effect of the three⁃axis mixing piles in the shield tunnels in the soft soillayer, considering two working conditions of unreinforced strata and grid reinforcement, the deformationand failure law of active and passive loadings of the shield tunnel excavation face and its influence onsurface displacement were compared and analyzed through numerical calculation. The results indicate thatthe horizontal displacement of the excavation surface and the vertical displacement of the surface aresignificantly reduced under the same support pressure after the shallow overburden section of the soft soilshield tunnel is reinforced by the triaxial mixing piles, and the deformation control effect is remarkable.There is a great difference in the evolution process of the excavation face under load between the gridreinforced strata and the natural unreinforced strata,which is mainly manifested in the distribution ofhorizontal displacement of the excavation face, the variation law of surface vertical displacement withsupport pressure, and the different ultimate failure modes

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岩土与地下工程 > 2025年 第卷 第07期