摘要
以上海某顶管工程为例,基于孔扩张理论解析解,建立了顶管-土-箱涵相互作用的计算分析模型,研究了开挖位置、开挖深度和掌子面支撑力对地层和箱涵的应力和变形的影响。结果表明:顶管顶进过程对土体的扰动主要在顶管轴线附近,地表位移和既有箱涵的竖向位移、应力沿顶管轴线左右对称;地表位移随掌子面支撑力和顶管埋深的增加而减小,其中竖向位移呈“V”型,水平位移呈顶管轴线对称;箱涵位移变化与地层相似,随顶管埋深增加,箱涵最大应力降低,而箱涵应力随掌子面支撑力的增加呈现先降低后升高的变化规律。对比实测数据与计算结果表明:该计算分析模型可靠性较好,可为相关工程提供参考。
Using a pipe jacking project in Shanghai as a case study,this study established a computational and analytical model for the interaction among pipe jacking,soil,and box culvert based on the analytical solution of the cavity expansion theory.The impact of excavation location,excavation depth,and face support pressure on the stress and deformation of the surrounding soil and box culvert was investigated.The results showed that the soil disturbance caused by the pipe jacking process was primarily concentrated near the pipe axis,with surface displacement,as well as vertical displacement and stress of the existing box culvert,showing symmetrical distribution along the pipe axis.Surface displacement decreased with increasing face support pressure and jacking depth.The vertical displacement exhibited a"V"-shaped pattern,while the horizontal displacement was symmetrical along the pipe axis.The displacement variation of the box culvert was similar to that of the soil.As the pipe jacking depth increased,the maximum stress of the box culvert decreased.However,the box culvert stress showed a trend of first decreasing and then increasing with rising face support pressure.A comparison between measured data and calculated results showed that the proposed calculation model had good reliability and could provide a reference for related engineering projects.
作者
段焜
莫品强
胡静
刘清楠
赵宁
DUAN Kun;MO Pinqiang;HU Jing;LIU Qingnan;ZHAO Ning(School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China;State Key Laboratory of Intelligent Construction and Healthy Operation&Maintenance of Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China)
出处
《防灾减灾工程学报》
北大核心
2025年第4期765-775,共11页
Journal of Disaster Prevention and Mitigation Engineering
基金
国家自然科学基金面上项目(52178374)
徐州市基础研究计划项目(KC22019)资助。
关键词
顶管
小孔扩张
计算分析模型
沉降
变形
pipe jacking
cavity expansion
computational and analytical model
settlement
deformation
