A Loading Method for Segment Lining Joint Test of Shield TBM Tunnel

A tunnel segment and lining technology, applied in the field of testing, can solve the problems that the mechanical mechanism of joints cannot be analyzed in detail, and the stress of concrete and bolts is not clear, etc.

Active Publication Date: 2019-04-26
CHINA RAILWAYS CORPORATION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Apparently, the conventional loading methods mentioned above are jointly stressed by concrete and bolts, and since the respective stress conditions of concrete and bolts are not clear, it is impossible to make a detailed analysis of the joint mechanics mechanism

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  • A Loading Method for Segment Lining Joint Test of Shield TBM Tunnel
  • A Loading Method for Segment Lining Joint Test of Shield TBM Tunnel
  • A Loading Method for Segment Lining Joint Test of Shield TBM Tunnel

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Embodiment Construction

[0026] The technical solutions of the embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0027] This example test studies the mechanical properties of the transverse joints of shield tunneling (TBM) tunnels under the action of earthquake force. Due to the limited conditions, a complete full-scale test between the rings cannot be carried out. Here, a full-scale model test of a single bolt member is selected.

[0028] Generally speaking, under the action of seismic load, axial tension, axial compression and longitudinal bending will occur in the longitudinal direction of shield machine (TBM) tunnel. When the tunnel is subjected to axial tension (compression) force, all the bolts of the annular joint have the same stress characteristics. In this case, the test is simple and clear, and will not be discussed here. When the TBM tunnel is subject to longitudinal bending, according to Shibo’s classic longitudinal bend...

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Abstract

The invention provides a shielding (TBM) tunnel segment lining joint seam test loading method. The method comprises the steps that firstly, the stress of a whole ring of a segment lining is calculatedaccording to a classic zhibo model; secondly, a research area is determined, and the stress characteristics of concrete and bolts of the research area are defined; finally, the external load during atest is reversely deduced under three situations according to the stress characteristics. The method aims at making the stress of the test research area consistent with the stress state of the wholering of the research area as much as possible, and therefore the stress characteristics of the whole ring of the segment lining is accurately simulated through the simplified segment lining joint seamtest; meanwhile, the implementation method is simple, feasible, safe and reliable.

Description

technical field [0001] The invention relates to the technical field of testing, in particular to a test loading method for segment lining joints of a shield tunnel (TBM). Background technique [0002] Shield machined (TBM) tunnels have been widely used in my country's railway and highway projects in recent years due to their fast, high-quality, high-efficiency, and safety features. The lining structure of a shield tunnel is mainly assembled from prefabricated segments, and a large number of prefabricated segment linings are also used in TBM tunnels, so there will be a large number of joints between the segment linings, and these joints are often the weak parts of the tunnel. The force and deformation of the ring have a significant impact, so it is very necessary to study the mechanical properties of the joint. At present, the prototype loading test is widely used in the research on the lining joints of shield tunnel (TBM) tunnels. Due to the difficulty and high cost of the ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): E21D11/08E21D9/06E21F17/00
CPCE21D9/06E21D11/083E21F17/00
Inventor晏启祥答志华赵冰冰耿萍何川
OwnerCHINA RAILWAYS CORPORATION