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Test method for detecting kinetic parameter of artificial polycrystalline ice

A technology of dynamic parameters and test methods, applied in the direction of testing material strength by applying repeated force/pulsation force

Inactive Publication Date: 2013-01-23
朱占元
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Problems solved by technology

However, the 134 km high-temperature and high-ice-content section of the Qinghai-Tibet Railway contains a large amount of soil-bearing ice, and the impact of train running on the soil-bearing ice or ice is rarely found in the literature.

Method used

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  • Test method for detecting kinetic parameter of artificial polycrystalline ice
  • Test method for detecting kinetic parameter of artificial polycrystalline ice
  • Test method for detecting kinetic parameter of artificial polycrystalline ice

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Embodiment Construction

[0023] The three-axis material testing machine of the present invention is the MTS-810 type vibrating three-axis material testing machine produced by MTS Company of the United States, equipped with automatic numerical control and data acquisition system, the confining pressure range is 0~20MPa, and the negative temperature range is normal temperature~-30 ℃, the frequency range is 0~50Hz, the maximum axial load is 250kN, and the maximum axial displacement is 50mm.

[0024] The ice samples used in the present invention are prepared according to the standard of geotechnical test method (GB / T50123-1999) and foundation dynamic characteristic test specification (GB / T 50269-1997) respectively. In order to ensure the comparability of test results, standard methods were used to prepare test pieces in batches. The ice samples selected were artificial isotropic polycrystalline ice with a particle size of <2 mm to make cylindrical ice samples with a diameter of 61.8 mm, a length of 125...

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Abstract

The invention discloses a test method for detecting a kinetic parameter of artificial polycrystalline ice. Based on a low-temperature dynamic triaxial test, a constitutive relation and a kinetic parameter index of the artificial polycrystalline ice under the action of a rail transit step cyclic load are researched. Under different negative temperatures and frequencies, an axial dynamic stress-stain relation curve of a test piece is considered, and an abstract of the invention 1 of the artificial polycrystalline ice is obtained: the dynamic constitutive relation can be described by using a linear viscoelasticity model, dynamic modulus of elasticity is lowered with the increase of the temperature and is increased with the increase of the frequency; and the coefficient of viscosity is increased with the increase of the temperature and is reduced with the increase of the frequency, therefore, a comprehensive expression among the kinetic parameter index, the dynamic modulus of elasticity, the coefficient of viscosity, and the temperature and the frequency is established.

Description

Technical field: [0001] The present invention studies the dynamic constitutive relationship and mechanical parameter indexes of artificial polycrystalline ice under the dynamic load of rail transit based on the low-temperature dynamic triaxial test, and accumulates basic data for the quantitative evaluation of the vibration response of the Qinghai-Tibet Railway train running at high temperature and high ice content roadbed. Background technique: [0002] The study of frozen soil dynamics began in the 1970s. Scholars at home and abroad have mainly focused on frozen soil earthquake engineering. Based on indoor and outdoor experiments, various empirical formulas have been proposed, and a large number of very meaningful results have been obtained. Development of Earthquake Engineering. However, the research on the dynamic characteristics of frozen soil under traffic loads is different from that under earthquake loads due to the particularity of the loads. At present, there ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32
Inventor 朱占元凌贤长陈士军张锋邹祖银王立娜李琼林郭子红
Owner 朱占元
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