Large rectangular cross-section tunnel undercrossing urban road by micro pipe jacking and joint assembly structure (MPJ & JAS) method in soft soils
Abstract With the continuous construction of urban traffic roads, more and more new roads are cut off by existing roads to form “dead end roads”. There is an urgent need for a trenchless method suitable for urban ultra-shallow overburden to build the undercrossing tunnel. To solve this problem, this...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2024-03-01
|
| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-024-55754-7 |
| _version_ | 1797275022831648768 |
|---|---|
| author | Jia Zou Xiongyao Xie Biao Zhou Chunzhao Jiang Zhen Zhang Jianjun Han Qing Dai Isam Shahrour |
| author_facet | Jia Zou Xiongyao Xie Biao Zhou Chunzhao Jiang Zhen Zhang Jianjun Han Qing Dai Isam Shahrour |
| author_sort | Jia Zou |
| collection | DOAJ |
| description | Abstract With the continuous construction of urban traffic roads, more and more new roads are cut off by existing roads to form “dead end roads”. There is an urgent need for a trenchless method suitable for urban ultra-shallow overburden to build the undercrossing tunnel. To solve this problem, this paper proposed the micro pipe jacking and joint assembly structure (MPJ & JAS) method, which has the characteristics of shallow burial depth, low cost, short construction time, flexible cross-section setting and high space utilization. The MPJ & JAS method construct a large cross-section tunnel through assembling small cross-section elements, quite different from traditional methods. Therefore, this paper designed a CT-shaped integrated joint, the mechanical performance of which was verified and clarified by tensile test. The bending test and finite element (FE) analysis proved the reliability of MPJ & JAS tunnel structure, and confirmed the structure performances such as the failure models, crack behaviors, load–deflection response and stress–strain distribution. Moreover, the influences of the steel plate thickness, concrete strength and shear connector spacing were determined by the FE analysis. On the basis of test results and reasonable assumptions, a theoretical design method considering the influence of the CT-shaped integrated joint was proposed, which can effectively predict the bending strength of the MPJ & JAS tunnel structure with an error of less than 10%. Finally, in view of the characteristics of the MPJ & JAS method, the suitable micro pipe jacking machine, soil reinforcement measure, hydraulic traction construction technology, high-precision guidance system and concrete construction quality detection method based on the phased array ultrasonic imaging technology were developed, supporting the accurate and efficient construction of the MPJ & JAS tunnel. |
| first_indexed | 2024-03-07T15:07:25Z |
| format | Article |
| id | doaj.art-9ddb0d228d1c487e927c6adfc8608c4e |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-03-07T15:07:25Z |
| publishDate | 2024-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-9ddb0d228d1c487e927c6adfc8608c4e2024-03-05T18:51:28ZengNature PortfolioScientific Reports2045-23222024-03-0114112510.1038/s41598-024-55754-7Large rectangular cross-section tunnel undercrossing urban road by micro pipe jacking and joint assembly structure (MPJ & JAS) method in soft soilsJia Zou0Xiongyao Xie1Biao Zhou2Chunzhao Jiang3Zhen Zhang4Jianjun Han5Qing Dai6Isam Shahrour7Department of Geotechnical Engineering, College of Civil Engineering, Tongji UniversityDepartment of Geotechnical Engineering, College of Civil Engineering, Tongji UniversityDepartment of Geotechnical Engineering, College of Civil Engineering, Tongji UniversityDepartment of Geotechnical Engineering, College of Civil Engineering, Tongji UniversityShanghai Urban Construction Municipal Engineering (Group) Co., Ltd.Shanghai Research Institute of Building Sciences Co., Ltd.Shanghai Architectural and Engineering Consultants Co., Ltd.Laboratoire de Genie Civil et Go-Environnement (LGCgE), Universit Lille1Abstract With the continuous construction of urban traffic roads, more and more new roads are cut off by existing roads to form “dead end roads”. There is an urgent need for a trenchless method suitable for urban ultra-shallow overburden to build the undercrossing tunnel. To solve this problem, this paper proposed the micro pipe jacking and joint assembly structure (MPJ & JAS) method, which has the characteristics of shallow burial depth, low cost, short construction time, flexible cross-section setting and high space utilization. The MPJ & JAS method construct a large cross-section tunnel through assembling small cross-section elements, quite different from traditional methods. Therefore, this paper designed a CT-shaped integrated joint, the mechanical performance of which was verified and clarified by tensile test. The bending test and finite element (FE) analysis proved the reliability of MPJ & JAS tunnel structure, and confirmed the structure performances such as the failure models, crack behaviors, load–deflection response and stress–strain distribution. Moreover, the influences of the steel plate thickness, concrete strength and shear connector spacing were determined by the FE analysis. On the basis of test results and reasonable assumptions, a theoretical design method considering the influence of the CT-shaped integrated joint was proposed, which can effectively predict the bending strength of the MPJ & JAS tunnel structure with an error of less than 10%. Finally, in view of the characteristics of the MPJ & JAS method, the suitable micro pipe jacking machine, soil reinforcement measure, hydraulic traction construction technology, high-precision guidance system and concrete construction quality detection method based on the phased array ultrasonic imaging technology were developed, supporting the accurate and efficient construction of the MPJ & JAS tunnel.https://doi.org/10.1038/s41598-024-55754-7TunnelMPJ & JAS methodCT-shaped integrated jointTheoretical design methodMicro pipe jacking construction |
| spellingShingle | Jia Zou Xiongyao Xie Biao Zhou Chunzhao Jiang Zhen Zhang Jianjun Han Qing Dai Isam Shahrour Large rectangular cross-section tunnel undercrossing urban road by micro pipe jacking and joint assembly structure (MPJ & JAS) method in soft soils Scientific Reports Tunnel MPJ & JAS method CT-shaped integrated joint Theoretical design method Micro pipe jacking construction |
| title | Large rectangular cross-section tunnel undercrossing urban road by micro pipe jacking and joint assembly structure (MPJ & JAS) method in soft soils |
| title_full | Large rectangular cross-section tunnel undercrossing urban road by micro pipe jacking and joint assembly structure (MPJ & JAS) method in soft soils |
| title_fullStr | Large rectangular cross-section tunnel undercrossing urban road by micro pipe jacking and joint assembly structure (MPJ & JAS) method in soft soils |
| title_full_unstemmed | Large rectangular cross-section tunnel undercrossing urban road by micro pipe jacking and joint assembly structure (MPJ & JAS) method in soft soils |
| title_short | Large rectangular cross-section tunnel undercrossing urban road by micro pipe jacking and joint assembly structure (MPJ & JAS) method in soft soils |
| title_sort | large rectangular cross section tunnel undercrossing urban road by micro pipe jacking and joint assembly structure mpj jas method in soft soils |
| topic | Tunnel MPJ & JAS method CT-shaped integrated joint Theoretical design method Micro pipe jacking construction |
| url | https://doi.org/10.1038/s41598-024-55754-7 |
| work_keys_str_mv | AT jiazou largerectangularcrosssectiontunnelundercrossingurbanroadbymicropipejackingandjointassemblystructurempjjasmethodinsoftsoils AT xiongyaoxie largerectangularcrosssectiontunnelundercrossingurbanroadbymicropipejackingandjointassemblystructurempjjasmethodinsoftsoils AT biaozhou largerectangularcrosssectiontunnelundercrossingurbanroadbymicropipejackingandjointassemblystructurempjjasmethodinsoftsoils AT chunzhaojiang largerectangularcrosssectiontunnelundercrossingurbanroadbymicropipejackingandjointassemblystructurempjjasmethodinsoftsoils AT zhenzhang largerectangularcrosssectiontunnelundercrossingurbanroadbymicropipejackingandjointassemblystructurempjjasmethodinsoftsoils AT jianjunhan largerectangularcrosssectiontunnelundercrossingurbanroadbymicropipejackingandjointassemblystructurempjjasmethodinsoftsoils AT qingdai largerectangularcrosssectiontunnelundercrossingurbanroadbymicropipejackingandjointassemblystructurempjjasmethodinsoftsoils AT isamshahrour largerectangularcrosssectiontunnelundercrossingurbanroadbymicropipejackingandjointassemblystructurempjjasmethodinsoftsoils |