中南大学学报（自然科学版）2026，Vol.57Issue(2)：708-717,10.DOI:10.11817/j.issn.1672-7207.2026.02.018
矩形顶管顶进过程中的背土效应
Soil-carrying effect in process of rectangular pipe jacking
摘要
Abstract
To address the problem of the soil-carrying effect,a new criterion for soil-carrying failure was proposed.Firstly,settlement monitoring data from practical engineering projects were analyzed to identify the soil zone affected by the soil-carrying effect.It was defined along the jacking direction as two upward-extending trapezoidal regions with an arc-shaped sliding surface at the front boundary.Secondly,based on four reasonable assumptions,the soil-carrying mass was simplified,and a 3D mechanical failure model for soil-carrying during rectangular pipe jacking was established,from which the failure criterion was derived.Thirdly,a practical engineering case was analyzed to perform a parametric sensitivity study,revealing the relationships between the soil-carrying effect and the jacking length,burial depth,and soil mechanical parameters.Finally,the critical friction coefficient at failure as well as the minimum cover depth required to prevent soil-carrying failure under different geological conditions were obtained.The results show that the critical pipe-soil friction coefficient increases with increasing burial depth,soil cohesion and internal friction angle,and decreases with increasing jacking length.A critical cohesion exists in the soil-carrying failure process.When the cohesion exceeds 12.5 kPa,the minimum burial depth decreases with increasing jacking distance,whereas the opposite trend is observed when the cohesion is lower than 12.5 kPa.In cohesionless soils,the stability of the soil-carrying mass is jointly controlled by the internal friction angle and the jacking length,and the minimum burial depth is highly sensitive to the jacking distance.When the jacking length exceeds 20 m,the minimum burial depth increases significantly,indicating that increasing the cover thickness or effectively reducing the pipe-soil friction is required to prevent overall soil-carrying failure.关键词
矩形顶管/地表隆沉/背土效应/判定方法/最浅埋深Key words
rectangular pipe jacking/surface uplift/carrying-soil effect/judgment method/shallowest buried depth分类
交通工程引用本文复制引用
刘浩,金大龙,袁大军,龚子邦,刘少华..矩形顶管顶进过程中的背土效应[J].中南大学学报（自然科学版）,2026,57(2):708-717,10.基金项目
国家重点研发计划项目(2024YFF0507901) （2024YFF0507901）
山东省重点研发计划项目(重大科技创新工程)(2021CXGC010209) （重大科技创新工程）
泰山产业领军人才工程资助项目(tscx202312129)(Project(2024YFF0507901)supported by the National Key R&D Program of China （tscx202312129）
Project(2021CXGC010209)supported by the Key R&D Program of Shandong Province （2021CXGC010209）
Project(tscx202312129)supported by the Taishan Industrial Experts Program) （tscx202312129）
