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。
The stability of the shallow overburden soil section of the shield tunnel in the coastal soft soil area 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 soil layer,considering two working conditions of unreinforced strata and grid reinforcement,the deformation and failure law of active and passive loadings of the shield tunnel excavation face and its influence on surface displacement were compared and analyzed through numerical calculation.The results indicate that the horizontal displacement of the excavation surface and the vertical displacement of the surface are significantly reduced under the same support pressure after the shallow overburden section of the soft soil shield 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 grid reinforced strata and the natural unreinforced strata,which is mainly manifested in the distribution of horizontal displacement of the excavation face,the variation law of surface vertical displacement with support pressure,and the different ultimate failure modes.
作者
张扬
曹雄
陈理堃
谭毅俊
ZHANG Yang;CAO Xiong;CHEN Likun;TAN Yijun(China Railway 15th Bureau Group Co.,Ltd.,Shanghai 200070,China;Zhuhai Institute of Urban Planning&Design,Zhuhai,Guangdong 519000,China;Guangdong Coastal Area Disaster Prevention and Mitigation Engineering Technology Research Center,Zhuhai,Guangdong 519000,China;Zhuhai Ruby Construction and Development Group Co.,Ltd.,Zhuhai,Guangdong 519000,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,Guangdong 518060,China)
出处
《施工技术(中英文)》
2025年第7期137-143,共7页
Construction Technology
基金
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))。
关键词
隧道
盾构
地基
软土
变形
水泥土搅拌桩
tunnels
shields
foundations
soft soil
deformation
cement soil mixing pile
作者简介
张扬,工程师,E-mail:358213820@qq.com;通信作者:曹雄,硕士,工程师,E-mail:xcao43@126.com。
