Experimental study on influence of lateral pressure coefficient of soil strata on mechanical properties of double-layer lining structure in shield tunnels

MA Xiaobin; WANG Shimin; LIU Chang; ZHONG Meiyun

doi:10.11779/CJGE20230909

Volume 47 Issue 4

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Chinese Journal of Geotechnical Engineering > 2025 > 47(4): 725-735. > DOI: 10.11779/CJGE20230909

MA Xiaobin, WANG Shimin, LIU Chang, ZHONG Meiyun. Experimental study on influence of lateral pressure coefficient of soil strata on mechanical properties of double-layer lining structure in shield tunnels[J]. Chinese Journal of Geotechnical Engineering, 2025, 47(4): 725-735. DOI: 10.11779/CJGE20230909

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Experimental study on influence of lateral pressure coefficient of soil strata on mechanical properties of double-layer lining structure in shield tunnels

Key Laboratory of Transportation Tunnel Engineering of the Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China

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Received Date: September 17, 2023
Available Online: April 17, 2024

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Abstract

Abstract

Nowadays, the construction scale of shield tunnels is getting larger and larger, and the strata crossed by the tunnels are complicated and changeable, so it is often difficult to meet the requirements of tunnel safety and durability by using the single-layer tube lining structure, and thus the double-layer lining structure has been more widely concerned. In order to explore the applicability of the double-layer lining structure of shield tunnels in different strata, relying on the Shiziyang Tunnel Project on the Guangzhou-Shenzhen High-speed Railway, the change rules of the mechanical properties of the double-layer lining structure under different strata conditions are comparatively analyzed with the lateral pressure coefficient (0.5, 0.6, 0.7, 0.8) as an index through the similar model tests. The test results show that the lateral pressure coefficient of the strata increases, the double-layer lining as a whole tends to be more hydrostatic pressure field state, the limit axial forces of the segmental lining and secondary lining increase, and the critical point of elasticity and plasticity and the mutation point of internal force delay. When the lateral pressure coefficient increases from 0.5 to 0.8, the ultimate bearing capacity of the double-layer lining increases by 66.39%, the maximum radial displacement decreases from 15.17 to 9.45 mm, the lateral displacement of the segmental lining is limited, and the secondary lining contribute to the improvement of the bearing capacity of segmental lining. The degree of crack development of segmental lining under high lateral pressure of strata decreases, the phenomenon of localized falling block is reduced, and the reliability of the overall structure of the double-layer lining is improved.
- shield tunnel,
- double-layer lining,
- model test,
- lateral pressure coefficient,
- mechanical property

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References

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