Method for determining long-term character of shield tunnel rubber sealing gasket

A technology for rubber sealing gaskets and shield tunnels, which is applied in the direction of strength characteristics, the use of stable tension/pressure test material strength, and measuring devices, which can solve the problems of long-term property prediction deviations of shield tunnel sealing rubber gaskets, and achieve The method is simple and effective

Pending Publication Date: 2021-08-27
SHANTOU UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

"The limitation of this method is that in the evaluation of the long-term mechanical properties of polymers, only the individual influence of stress relaxation or creep on the mechanical properties of polymers is considered, and the stress relaxat

Method used

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  • Method for determining long-term character of shield tunnel rubber sealing gasket
  • Method for determining long-term character of shield tunnel rubber sealing gasket
  • Method for determining long-term character of shield tunnel rubber sealing gasket

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Embodiment

[0038] A method for determining the long-term properties of the shield tunnel rubber gasket provided in this embodiment, the method has the following steps:

[0039] Step 1, prepare EPDM test sample;

[0040] In this embodiment, the EPDM test sample is pretreated by mixing raw rubber, carbon black, calcium carbonate, 300# paraffin oil, calcium oxide, sulfur, stearic acid, zinc oxide and other components in a certain proportion, and then In-situ pre-vulcanization and compression molding, and stored at room temperature for 24 hours, and finally cut into dumbbell-shaped specimens.

[0041] In this embodiment, the weight of the raw rubber is 100phr, and 3092M is used.

[0042]In this example, the weight of the carbon black is 70 phr, N550 is used, and the residue on the 325-mesh sieve is ≤0.1%.

[0043] In the present embodiment, the calcium carbonate is light calcium carbonate with a weight of 20phr and an average particle diameter of 1250 mesh.

[0044] In the present embodim...

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Abstract

The invention relates to the field of shield tunnel rubber sealing gaskets, in particular to a method for determining the long-term character of a shield tunnel rubber sealing gasket. The method comprises the steps of according to the relationship that the modulus is reduced along with the increase of time and the curve shape only moves horizontally at different temperatures, horizontally moving a short-term stress relaxation curve and a short-term creep curve to obtain a corresponding relaxation modulus sub-curve and a corresponding creep compliance sub-curve; horizontally translating the relaxation modulus sub-curve to obtain a relaxation modulus main curve according to a relationship between a stress relaxation behavior under one temperature or stress or a creep behavior under strain and a stress relaxation behavior under another temperature or stress or a creep behavior under strain; horizontally translating the creep compliance sub-curve to obtain a creep compliance main curve; and predicting the relaxation modulus value of an EPDM test sample in specified time from the relaxation modulus main curve, and predicting the creep compliance of the EPDM test sample in specified time from the creep compliance main curve.

Description

technical field [0001] The invention relates to the field of shield tunnel rubber gaskets, in particular to a method for determining long-term properties of shield tunnel rubber gaskets. Background technique [0002] In recent years, polymers have been increasingly used in engineering projects due to their excellent elastic properties. For example, EPDM rubber is often used to manufacture tunnel joint gaskets. However, the time dependence of polymers has an important impact on the degradation of their mechanical properties during their long-term use. Two common forms of time-varying behavior in polymers are creep and stress relaxation. Ethylene-propylene-diene monomer (EPDM) rubber gaskets for shield tunnels rely on compression to generate rebound to prevent groundwater from seeping into the tunnel. But the time dependencies of EPDM, such as stress relaxation and creep, can reduce the waterproof performance of the gasket over the 100-year service life. In addition, EPDM i...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/04
CPCG01N3/08G01N3/04G01N2203/0071
Inventor 张鑫王泽念沈水龙张宁闫涛
Owner SHANTOU UNIV
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