Investigation of the Ultimate Bearing Capacity of a Staggered Assembly Segmental Lining for an Urban Gas Transmission Tunnel

This paper presents a local prototype compression-bending test to investigate the specific failure process, failure characteristics and the ultimate bearing capacity of a staggered assembly segmental lining for an urban gas transmission tunnel. The results indicate that the initial crack in the structure appears at the middle ring close to the longitudinal joint of the adjacent ring, and it develops into the main crack at final damage. The compression-flexure failure occurs in the middle of the structure and the compressive shear failure occurs at both ends of the structure. The failure mechanism is analysed and is found to be caused by cracking in the region where the stiffness is relatively larger. In addition, the cracking results in the redistribution of the overall stiffness of the structure, and subsequently the region with the greatest stiffness continues to crack, repeating the cycle until the ultimate bearing capacity is reached with continuous enlargement of the deformation. Based on the test results, a progressive N-M correlation curve is proposed to calculate the sectional ultimate bearing capacity. The contribution of the staggered assembly effect is included in the curve. The proposed calculation method is verified by the test results. Finally, the influence of the section size and material strength on the sectional ultimate bearing capacity are investigated using the proposed curve.

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  • English

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  • Accession Number: 01708992
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 20 2019 3:04PM