隧道基底深厚软弱地层桩基设计数量选取研究  

Study on Design Quantity Selection of Pile Foundation in Deep&Weak Stratum of Tunnel Basement

作　　者：张海波 ZHANG Hai-bo(Shanghai Urban Construction Design&Research InstituteCo.,Ltd.,Shanghai 200125,China)

机构地区：[1]上海市城市建设设计研究总院(集团)有限公司,上海200125

出　　处：《中国市政工程》2023年第6期85-89,105,106,共7页China Municipal Engineering

摘　　要：隧道基底的软弱地层是引起隧道底板病害的重要原因之一。基于某隧道工程,采用有限元数值分析方法,通过建立地层-结构模型,研究不同桩基数量对隧道深厚软弱地层处理效果的影响,得到以下结论:在一定范围内,隧道竖向位移、衬砌内力与桩基数量呈负相关,增加桩基数量能有效控制隧道竖向位移并减小衬砌内力;桩数为某一量值时(最优桩数由工程具体情况决定),桩基加固效果最优,继续增加桩数,隧道位移和衬砌内力不再减少。The weak strata at the foundation of a tunnel are one of the important causes of tunnel floor diseases.Based on a certain tunnel project,finite element numerical analysis method is used to establish a stratum structure model and study the effect of different pile foundation numbers on the treatment effect of deep&weak strata in the tunnel.The following conclusions are obtained:within a certain range,the vertical displacement of the tunnel,the internal force of the lining,and the number of pile foundations are negatively correlated.Increasing the number of pile foundations can effectively control the vertical displacement of the tunnel and reduce the internal force of the lining.When the number of piles is a certain value(the optimal number of piles depends on the specific situation of the project),the reinforcement effect of the pile foundation is optimal.If the number of piles continues to increase,the displacement of the tunnel and the internal force of the lining will no longer decrease.

关 键 词：软基隧道 桩基数量 锚杆轴力 衬砌弯矩 

分 类 号：U456.31[建筑科学—桥梁与隧道工程]