Shield tunnel segment structure safety evaluation model and method

Abstract

The invention discloses a shield tunnel segment structure safety evaluation model and method. According to the model, subsystems are formed with bending moment zero point sections and first joint sections of a structure as boundaries, main sections and second joint sections between the bending moment zero point sections and the first joint sections are regarded as the subsystems connected in series respectively, and the failure of any subsystem represents the failure of the whole structure system; each segment main section subsystem comprises a plurality of segment main sections which are connected with one another in parallel. According to the method, all the sections in each subsystem are subject to safety checkup, and it is judged that the corresponding segment main section subsystem is damaged when the number of the main sections meeting damage conditions in the segment main section subsystem reaches 2 / 3 the total number of the main sections; when the joint sections meet the damage conditions, the joint section subsystem is damaged, and it is represented that the shield tunnel segment structure is damaged when any subsystem is damaged. By means of the shield tunnel segment structure safety evaluation model and method, judgment on ultimate states is more scientific and reasonable, and safety evaluation expression is simpler and clearer.

Description

Technical field: [0001] The invention discloses a safety evaluation model and method for a shield tunnel segment structure. Background technique: [0002] At present, for the safety assessment of shield tunnel segments and similar statically indeterminate ring structures, most of them adopt the single-section damage stage method, such as my country's "Code for Design of Railway Tunnels" (TB10003-2005), "Code for Design of Highway Tunnels" (JTGD70-2004), etc., it is considered that once a certain section fails to meet the corresponding allowable safety factor requirements, the structure is judged to be damaged. This method is obviously very unreasonable for statically indeterminate structures. In the actual engineering practice, it has also been shown that the destruction of a single section will not lead to the destruction of the entire structural system. At the same time, there is still no effective expression method for the overall safety factor of the tunnel lining struct...

AI Technical Summary

Problems solved by technology

At the same time, there is still no effective expression method for the overall safety factor of the tunnel lining structure itself, which makes it often a vague reference value and vague conceptual meaning in the safety assessment of this type of structure.

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