摘要
针对浅埋矩形顶管顶进的背土效应,提出覆盖背土竖向扩展阶段、水平扩展阶段和整体背土阶段的全过程理论分析模型,确定顶管顶进的松动土压力、管土摩擦力、侧壁剪切约束力和前端阻力的计算方法,得到背土启动和发展全过程的理论计算公式.结果表明:背土是否启动主要由顶管上覆土层的厚度、地层土体特性和管土摩擦特性决定,与顶进长度无直接关系;背土竖向扩展阶段的背土区域厚度和水平扩展阶段的地表扩展宽度都随着顶进长度的增加而非线性增长;理论分析结果与矩形顶管顶进全过程三维有限元模拟结果和现场实测结果吻合较好,理论公式可为矩形顶管背土发展全过程预测分析提供一种有效而简便的方法.
Considering the carrying-soil effect resulting from the jacking of shallow-buried rectangular pipes,a theoretical model for analyzing the entire construction process,covering the vertical extension phase,the horizontal extension phase,and overall carry-soil phase is proposed.The methods for calculating the loosening soil pressure,pipe-soil friction,side wall shear resistance,and front end friction resistance are determined.The theoretical formulas to identify the initiation and development of carrying-soil effect are established.The results show that the initiation of carrying-soil effect primarily depends on factors such as the thickness of the overlying soil layer,soil characteristics,and pipe-soil friction,rather than the jacking length.During the vertical and horizontal spreading phases,the thickness and width of the carried soil layer exhibit nonlinear increases with the elongation of the jacking process.These findings align well with the outcomes obtained through three-dimensional finite element simulations of rectangular pipe jacking and the field tests.In conclusion,the theoretical formulas offer an effective approach for predicting the initiation and evolution of carrying-soil effects resulting from the jacking of rectangular pipes.
作者
马晓宾
苏栋
吴永照
吴炯
阳文胜
王雷
陈湘生
MA Xiaobin;SU Dong;WU Yongzhao;WU Jiong;YANG Wensheng;WANG Lei;CHEN Xiangsheng(Shenzhen Municipal Design&Research Co.,Ltd.,Shenzhen,Guangdong 518029,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,Guangdong 518060,China;Key Laboratory for Resilient Infrastructures of Coastal Cities(MOE),Shenzhen University,Shenzhen,Guangdong 518060,China;Shenzhen Key Laboratory of Green,Efficient and Intelligent Construction of Underground Metro Station,Shenzhen University,Shenzhen,Guangdong 518060,China)
出处
《福州大学学报（自然科学版）》
CAS
北大核心
2024年第5期569-576,共8页
Journal of Fuzhou University(Natural Science Edition)
基金
国家自然科学基金资助项目(51938008)
广东省重点领域研发计划资助项目(2019B111105001)
深圳市自然科学基金资助项目(JCYJ20210324094607020)。
关键词
浅埋矩形顶管
背土效应
竖向扩展
水平扩展
松动土压力
shallow buried rectangular pipe jacking
carrying-soil effect
vertical spreading
horizontal spreading
loosening earth pressure
