Experimental study on effect of ductile-iron panel stiffness on mechanical properties of segmental joints of shield tunnels
In circular shield tunnels bearing high inner pressure or rectangular shaped shield tunnels, as the axial force at the segmental lining decreases, the bolt load at the segmental joint increases. It is essential to adopt high-stiffness segmental joints to improve the bearing capacity and control the...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2022-12-01
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| Series: | Underground Space |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2467967422000381 |
| _version_ | 1797705620665663488 |
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| author | Long Zhou Zhiguo Yan Yi Shen Linxing Guan |
| author_facet | Long Zhou Zhiguo Yan Yi Shen Linxing Guan |
| author_sort | Long Zhou |
| collection | DOAJ |
| description | In circular shield tunnels bearing high inner pressure or rectangular shaped shield tunnels, as the axial force at the segmental lining decreases, the bolt load at the segmental joint increases. It is essential to adopt high-stiffness segmental joints to improve the bearing capacity and control the deformation at the joint position. When designing high-stiffness segmental joints, the selection of ductile-iron joint panel is crucial. In this study, two types of segmental joints with different joint panels were fabricated, and the effects of joint panel stiffness on the mechanical properties of segmental joints were analyzed through full-scale sagging and hogging bending tests. The results showed that the failure mode of high-stiffness segmental joint was similar to that of large eccentric compression section. According to the difference of panel stiffness, the failure modes can be specified into two types. If the stiffness is sufficient, the joint failure occurs due to the yielding of bolts; otherwise, it occurs due to the large deformation of ductile-iron joint panels. As for the design requirement of segmental joint, the stiffness of joint panel should be sufficient, i.e., the opening and failure of the joints are finally induced by the bolt deformation. Otherwise, before the plastic deformation of the bolts, the large deformation of the joint panels will occur under a bending-moment-dominant load, and the bearing capacity of the joints will greatly decrease. |
| first_indexed | 2024-03-12T05:40:05Z |
| format | Article |
| id | doaj.art-f1996235718e4b3b9888692bc3c25624 |
| institution | Directory Open Access Journal |
| issn | 2467-9674 |
| language | English |
| last_indexed | 2024-03-12T05:40:05Z |
| publishDate | 2022-12-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Underground Space |
| spelling | doaj.art-f1996235718e4b3b9888692bc3c256242023-09-03T06:13:46ZengKeAi Communications Co., Ltd.Underground Space2467-96742022-12-017610561067Experimental study on effect of ductile-iron panel stiffness on mechanical properties of segmental joints of shield tunnelsLong Zhou0Zhiguo Yan1Yi Shen2Linxing Guan3College of Civil Engineering, Tongji University, Shanghai 200092, ChinaCollege of Civil Engineering, Tongji University, Shanghai 200092, China; State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, ChinaCollege of Civil Engineering, Tongji University, Shanghai 200092, China; Corresponding author.Shanghai Municipal Engineering Design Institute (Group) Co. Ltd., Shanghai 200092, ChinaIn circular shield tunnels bearing high inner pressure or rectangular shaped shield tunnels, as the axial force at the segmental lining decreases, the bolt load at the segmental joint increases. It is essential to adopt high-stiffness segmental joints to improve the bearing capacity and control the deformation at the joint position. When designing high-stiffness segmental joints, the selection of ductile-iron joint panel is crucial. In this study, two types of segmental joints with different joint panels were fabricated, and the effects of joint panel stiffness on the mechanical properties of segmental joints were analyzed through full-scale sagging and hogging bending tests. The results showed that the failure mode of high-stiffness segmental joint was similar to that of large eccentric compression section. According to the difference of panel stiffness, the failure modes can be specified into two types. If the stiffness is sufficient, the joint failure occurs due to the yielding of bolts; otherwise, it occurs due to the large deformation of ductile-iron joint panels. As for the design requirement of segmental joint, the stiffness of joint panel should be sufficient, i.e., the opening and failure of the joints are finally induced by the bolt deformation. Otherwise, before the plastic deformation of the bolts, the large deformation of the joint panels will occur under a bending-moment-dominant load, and the bearing capacity of the joints will greatly decrease.http://www.sciencedirect.com/science/article/pii/S2467967422000381Ductile-iron joint panelHigh-stiffness segmental jointShield tunnelExperimental study |
| spellingShingle | Long Zhou Zhiguo Yan Yi Shen Linxing Guan Experimental study on effect of ductile-iron panel stiffness on mechanical properties of segmental joints of shield tunnels Underground Space Ductile-iron joint panel High-stiffness segmental joint Shield tunnel Experimental study |
| title | Experimental study on effect of ductile-iron panel stiffness on mechanical properties of segmental joints of shield tunnels |
| title_full | Experimental study on effect of ductile-iron panel stiffness on mechanical properties of segmental joints of shield tunnels |
| title_fullStr | Experimental study on effect of ductile-iron panel stiffness on mechanical properties of segmental joints of shield tunnels |
| title_full_unstemmed | Experimental study on effect of ductile-iron panel stiffness on mechanical properties of segmental joints of shield tunnels |
| title_short | Experimental study on effect of ductile-iron panel stiffness on mechanical properties of segmental joints of shield tunnels |
| title_sort | experimental study on effect of ductile iron panel stiffness on mechanical properties of segmental joints of shield tunnels |
| topic | Ductile-iron joint panel High-stiffness segmental joint Shield tunnel Experimental study |
| url | http://www.sciencedirect.com/science/article/pii/S2467967422000381 |
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