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Aging testing method of shield tunnel elastic sealing gasket finished products

An elastic sealing, shield tunneling technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as not very scientific, and achieve the effects of scientific and accurate detection methods, effective and accurate experimental results, and strong operability

Inactive Publication Date: 2015-09-16
TONGJI UNIV +2
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  • Application Information

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Problems solved by technology

The waterproof performance of the gasket is mainly reflected in the contact stress between the gaskets. Although there is a certain relationship between the stress relaxation caused by long-term aging and the height reduction rate of the gasket test piece, it is not strictly corresponding. Therefore, the height reduction rate is used as the aging performance. The representation of is not very scientific

Method used

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  • Aging testing method of shield tunnel elastic sealing gasket finished products
  • Aging testing method of shield tunnel elastic sealing gasket finished products
  • Aging testing method of shield tunnel elastic sealing gasket finished products

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[0070] (1) The first step is to obtain the short-term stress relaxation coefficient

[0071] Table 2 Summary of short-term stress relaxation data

[0072]

[0073] (2) The second step is to obtain long-term stress experimental data

[0074] Table 3 Stress relaxation coefficient σ / σ under different temperature and aging time conditions 0 data (outside gasket)

[0075]

[0076] Table 4 Stress relaxation coefficient σ / σ under different temperature and aging time conditions 0 data (inner channel gasket)

[0077]

[0078]

[0079] (3) In the third step, the long-term stress relaxation coefficient is obtained by regression analysis

[0080] Table 5 Model regression parameters

[0081]

[0082] Note: R-square represents the percentage of the dependent variable that the fitted model can explain

[0083] And assuming that the normal temperature condition is T=20°C, the amount of stress relaxation under each aging age t is predicted. It is calculated that the relax...

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Abstract

The invention discloses an aging testing method of shield tunnel elastic sealing gasket finished products. A high-temperature aging box is used for experimentally simulating the long-term stress relaxation of a seal gasket; the stress relaxation rate of the seal gasket is calculated according to the contact stress measured by a high-temperature stress meter. The aging testing method comprises the following steps: a fixture clamps the seal gasket to perform a stress relaxation experiment at normal temperature so as to obtain a short-term stress relaxation coefficient; an aging experiment is performed at different temperature points so as to measure the contact stress at the key time point; the stress relaxation data of the seal gasket under the open amount state of each joint are regressed; the long-term stress relaxation rate for reflecting the chemical stress relaxation is calculated; the short-term stress relaxation rate multiplies the long-term stress relaxation rate to reflect the aging degree of the seal gasket. According to the invention, the ageing of the seal gasket is accelerated by the high-temperature aging box, and the stress attenuation rate of the seal gasket at normal temperature can be obtained by numerical value simulation, so that the experiment time is shortened, and the accuracy of the experiment result is also increased. The stress relaxation rate is considered by utilizing the contact stress of the seal gasket, and is relatively accurate and effective.

Description

technical field [0001] The invention belongs to the field of tunnel and underground engineering engineering, and relates to a method for detecting the aging of finished products of a shield tunnel elastic sealing gasket. Background technique [0002] At present, the aging detection of sealing gaskets is still carried out by using conventional fixtures to clamp the sealing gaskets at room temperature. Since we want to reflect the long-term (hundred-year) waterproof performance of the gasket, the experimental time of the normal temperature experiment will inevitably last longer. However, in the early stage of the aging of the gasket, physical stress relaxation is mainly used, and in the later stage, the stress relaxation caused by chemical reaction is mainly used. The normal temperature experiment can only reflect the former, so the results cannot be accurate and effective. In addition, in the past, when measuring the stress relaxation of the gasket, after holding it with a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N19/00G01N17/00
Inventor 刘建国周顺华贺腾飞王文渊
Owner TONGJI UNIV
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