Construction Scheme Effects on Deformation Controls for Open-Top UBITs Underpassing Existing Stations
Urban rail transit networks’ rapid expansions have led to increasing intersections between existing and new lines, particularly in dense urban areas where new stations must underpass existing infrastructure at zero distance. Deformation controls during construction are critical for maintaining the o...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-08-01
|
| Series: | Buildings |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-5309/15/15/2762 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849407703227564032 |
|---|---|
| author | Yanming Yao Junhong Zhou Mansheng Tan Mingjie Jia Honggui Di |
| author_facet | Yanming Yao Junhong Zhou Mansheng Tan Mingjie Jia Honggui Di |
| author_sort | Yanming Yao |
| collection | DOAJ |
| description | Urban rail transit networks’ rapid expansions have led to increasing intersections between existing and new lines, particularly in dense urban areas where new stations must underpass existing infrastructure at zero distance. Deformation controls during construction are critical for maintaining the operational safety of existing stations, especially in soft soil conditions where construction-induced settlement poses significant risks to structural integrity. This study systematically investigates the influence mechanisms of different construction schemes on base plate deformation when an open-top UBIT (underground bundle composite pipe integrated by transverse pre-stressing) underpasses existing stations. Through precise numerical simulation using PLAXIS 3D, the research comparatively analyzed the effects of 12 pipe jacking sequences, 3 pre-stress levels (1116 MPa, 1395 MPa, 1674 MPa), and 3 soil chamber excavation schemes, revealing the mechanisms between the deformation evolution and soil unloading effects. The continuous jacking strategy of adjacent pipes forms an efficient support structure, limiting maximum settlement to 5.2 mm. Medium pre-stress level (1395 MPa) produces a balanced deformation pattern that optimizes structural performance, while excavating side chambers before the central chamber effectively utilizes soil unloading effects, achieving controlled settlement distribution with maximum values of −7.2 mm. The optimal construction combination demonstrates effective deformation control, ensuring the operational safety of existing station structures. These findings enable safer and more efficient urban underpassing construction. |
| format | Article |
| id | doaj-art-29ce083ea564402d8a56acf810d0567a |
| institution | Kabale University |
| issn | 2075-5309 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj-art-29ce083ea564402d8a56acf810d0567a2025-08-20T03:35:58ZengMDPI AGBuildings2075-53092025-08-011515276210.3390/buildings15152762Construction Scheme Effects on Deformation Controls for Open-Top UBITs Underpassing Existing StationsYanming Yao0Junhong Zhou1Mansheng Tan2Mingjie Jia3Honggui Di4Ningbo Rail Transit Group Co., Ltd., Ningbo 315101, ChinaNingbo Regional Railway Investment and Development Co., Ltd., Ningbo 315101, ChinaChina Railway Liuyuan Group Co., Ltd., Tianjin 300308, ChinaChina Railway Liuyuan Group Co., Ltd., Tianjin 300308, ChinaShanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, Shanghai 201804, ChinaUrban rail transit networks’ rapid expansions have led to increasing intersections between existing and new lines, particularly in dense urban areas where new stations must underpass existing infrastructure at zero distance. Deformation controls during construction are critical for maintaining the operational safety of existing stations, especially in soft soil conditions where construction-induced settlement poses significant risks to structural integrity. This study systematically investigates the influence mechanisms of different construction schemes on base plate deformation when an open-top UBIT (underground bundle composite pipe integrated by transverse pre-stressing) underpasses existing stations. Through precise numerical simulation using PLAXIS 3D, the research comparatively analyzed the effects of 12 pipe jacking sequences, 3 pre-stress levels (1116 MPa, 1395 MPa, 1674 MPa), and 3 soil chamber excavation schemes, revealing the mechanisms between the deformation evolution and soil unloading effects. The continuous jacking strategy of adjacent pipes forms an efficient support structure, limiting maximum settlement to 5.2 mm. Medium pre-stress level (1395 MPa) produces a balanced deformation pattern that optimizes structural performance, while excavating side chambers before the central chamber effectively utilizes soil unloading effects, achieving controlled settlement distribution with maximum values of −7.2 mm. The optimal construction combination demonstrates effective deformation control, ensuring the operational safety of existing station structures. These findings enable safer and more efficient urban underpassing construction.https://www.mdpi.com/2075-5309/15/15/2762UBITunderpassing stationnumerical simulationdeformation control |
| spellingShingle | Yanming Yao Junhong Zhou Mansheng Tan Mingjie Jia Honggui Di Construction Scheme Effects on Deformation Controls for Open-Top UBITs Underpassing Existing Stations Buildings UBIT underpassing station numerical simulation deformation control |
| title | Construction Scheme Effects on Deformation Controls for Open-Top UBITs Underpassing Existing Stations |
| title_full | Construction Scheme Effects on Deformation Controls for Open-Top UBITs Underpassing Existing Stations |
| title_fullStr | Construction Scheme Effects on Deformation Controls for Open-Top UBITs Underpassing Existing Stations |
| title_full_unstemmed | Construction Scheme Effects on Deformation Controls for Open-Top UBITs Underpassing Existing Stations |
| title_short | Construction Scheme Effects on Deformation Controls for Open-Top UBITs Underpassing Existing Stations |
| title_sort | construction scheme effects on deformation controls for open top ubits underpassing existing stations |
| topic | UBIT underpassing station numerical simulation deformation control |
| url | https://www.mdpi.com/2075-5309/15/15/2762 |
| work_keys_str_mv | AT yanmingyao constructionschemeeffectsondeformationcontrolsforopentopubitsunderpassingexistingstations AT junhongzhou constructionschemeeffectsondeformationcontrolsforopentopubitsunderpassingexistingstations AT manshengtan constructionschemeeffectsondeformationcontrolsforopentopubitsunderpassingexistingstations AT mingjiejia constructionschemeeffectsondeformationcontrolsforopentopubitsunderpassingexistingstations AT hongguidi constructionschemeeffectsondeformationcontrolsforopentopubitsunderpassingexistingstations |