Experimental Study on Mechanical Differences Between Prefabricated and Cast-In Situ Tunnel Linings Based on a Load-Structure Model
With the accelerated development of urban underground spaces, prefabricated tunnel linings have become a research focus due to their advantages in construction efficiency and cost effectiveness. However, issues such as stress concentration at joints and insufficient overall stability hinder their br...
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MDPI AG
2025-07-01
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| Online Access: | https://www.mdpi.com/2075-5309/15/14/2522 |
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| author | Li-Ming Wu Hong-Kun Li Feng Gao Zi-Jian Wang Bin Zhang Wen-Jie Luo Jun-Jie Li |
| author_facet | Li-Ming Wu Hong-Kun Li Feng Gao Zi-Jian Wang Bin Zhang Wen-Jie Luo Jun-Jie Li |
| author_sort | Li-Ming Wu |
| collection | DOAJ |
| description | With the accelerated development of urban underground spaces, prefabricated tunnel linings have become a research focus due to their advantages in construction efficiency and cost effectiveness. However, issues such as stress concentration at joints and insufficient overall stability hinder their broader application. This study investigates a cut-and-cover prefabricated tunnel project in the Chongqing High-Tech Zone through scale model tests and numerical simulations to systematically compare the mechanical behaviors of cast-in situ linings and three-segment prefabricated linings under surrounding rock loads. The experimental results show that the ultimate bearing capacity of the prefabricated lining is 15.3% lower than that of the cast-in situ lining, with asymmetric failure modes and cracks concentrated near joint regions. Numerical simulations further reveal the influence of joint stiffness on structural performance: when the joint stiffness is 30 MN·m/rad, the bending moment of the segmented lining decreases by 37.7% compared to the cast-in situ lining, while displacement increments remain controllable. By optimising joint pre-tightening forces and stiffness parameters, prefabricated linings can achieve stability comparable to cast-in situ structures while retaining construction efficiency. This research provides theoretical and technical references for the design and construction of open-cut prefabricated tunnel linings. |
| format | Article |
| id | doaj-art-782754b855f142dc9b2b2593b7e866e3 |
| institution | DOAJ |
| issn | 2075-5309 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj-art-782754b855f142dc9b2b2593b7e866e32025-08-20T03:08:10ZengMDPI AGBuildings2075-53092025-07-011514252210.3390/buildings15142522Experimental Study on Mechanical Differences Between Prefabricated and Cast-In Situ Tunnel Linings Based on a Load-Structure ModelLi-Ming Wu0Hong-Kun Li1Feng Gao2Zi-Jian Wang3Bin Zhang4Wen-Jie Luo5Jun-Jie Li6School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaSchool of Civil and Hydraulic Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaSchool of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, ChinaSchool of Civil and Hydraulic Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaSchool of Civil and Hydraulic Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaSchool of Civil and Hydraulic Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaSchool of Civil and Hydraulic Engineering, Chongqing University of Science and Technology, Chongqing 401331, ChinaWith the accelerated development of urban underground spaces, prefabricated tunnel linings have become a research focus due to their advantages in construction efficiency and cost effectiveness. However, issues such as stress concentration at joints and insufficient overall stability hinder their broader application. This study investigates a cut-and-cover prefabricated tunnel project in the Chongqing High-Tech Zone through scale model tests and numerical simulations to systematically compare the mechanical behaviors of cast-in situ linings and three-segment prefabricated linings under surrounding rock loads. The experimental results show that the ultimate bearing capacity of the prefabricated lining is 15.3% lower than that of the cast-in situ lining, with asymmetric failure modes and cracks concentrated near joint regions. Numerical simulations further reveal the influence of joint stiffness on structural performance: when the joint stiffness is 30 MN·m/rad, the bending moment of the segmented lining decreases by 37.7% compared to the cast-in situ lining, while displacement increments remain controllable. By optimising joint pre-tightening forces and stiffness parameters, prefabricated linings can achieve stability comparable to cast-in situ structures while retaining construction efficiency. This research provides theoretical and technical references for the design and construction of open-cut prefabricated tunnel linings.https://www.mdpi.com/2075-5309/15/14/2522prefabricated tunnel liningload-structure modelscale model testjoint stiffnessnumerical simulation |
| spellingShingle | Li-Ming Wu Hong-Kun Li Feng Gao Zi-Jian Wang Bin Zhang Wen-Jie Luo Jun-Jie Li Experimental Study on Mechanical Differences Between Prefabricated and Cast-In Situ Tunnel Linings Based on a Load-Structure Model Buildings prefabricated tunnel lining load-structure model scale model test joint stiffness numerical simulation |
| title | Experimental Study on Mechanical Differences Between Prefabricated and Cast-In Situ Tunnel Linings Based on a Load-Structure Model |
| title_full | Experimental Study on Mechanical Differences Between Prefabricated and Cast-In Situ Tunnel Linings Based on a Load-Structure Model |
| title_fullStr | Experimental Study on Mechanical Differences Between Prefabricated and Cast-In Situ Tunnel Linings Based on a Load-Structure Model |
| title_full_unstemmed | Experimental Study on Mechanical Differences Between Prefabricated and Cast-In Situ Tunnel Linings Based on a Load-Structure Model |
| title_short | Experimental Study on Mechanical Differences Between Prefabricated and Cast-In Situ Tunnel Linings Based on a Load-Structure Model |
| title_sort | experimental study on mechanical differences between prefabricated and cast in situ tunnel linings based on a load structure model |
| topic | prefabricated tunnel lining load-structure model scale model test joint stiffness numerical simulation |
| url | https://www.mdpi.com/2075-5309/15/14/2522 |
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