Design Criterion for Bearing Capacity of Grouted Mortise-Tenon Joints
in&nbsp;Prefabricated Underground Structures

LIN Fang; YANG Xiuren

doi:10.3973/j.issn.2096-4498.2025.03.014

Tunnel Construction >

2025 , Vol. 45 >Issue 3: 587 - 595

DOI: https://doi.org/10.3973/j.issn.2096-4498.2025.03.014

Design Criterion for Bearing Capacity of Grouted Mortise-Tenon Joints in Prefabricated Underground Structures

LIN Fang ,
YANG Xiuren

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(1. Beijing Urban Construction Design & Development Group Co., Ltd., Beijing 100037, China; 2. National Engineering Research Center of Green & Safe Construction Technology in Urban Rail Transit, Beijing 100037, China)

Online published: 2025-03-20

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Abstract

The working state of the grouted mortise-tenon joints with significant bearing capacity is a crucial component in the design of dry-connection prefabricated station structures. The authors analyze the bearing capacity margin of various grouted mortise-tenon joints and propose a classification rule for the joint design criteria based on the results of the 1∶1 prototype loading test on various joints along the primary stress directions. It is suggested that the second inflection point in the joint bearing characteristic curve should be used as the limit value for the design verification of the working bending moment of the joint structure. Subsequently, the rationality of such a design criterion inflection point is validated in terms of joint deformation, joint rotation, and bending stiffness. On this basis, an envelope diagram of the bearing capacity criterion for double-tenon joints with the pretensioned steel bars on the tension side is established. The finite element numerical simulations and field test results of the same joints in practical applications are verified. The numerical calculation and the field test results indicate that the studied joints exhibit a large safety margin.

Key words： metro station; prefabrication and assembly; grouted mortise-tenon joint; bearing capacity; design criterion

Cite this article

LIN Fang , YANG Xiuren .

Design Criterion for Bearing Capacity of Grouted Mortise-Tenon Joints in Prefabricated Underground Structures

[J]. Tunnel Construction, 2025 , 45(3) : 587 -595 . DOI: 10.3973/j.issn.2096-4498.2025.03.014

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