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Gradient confining pressure loading method

A gradient and height-direction technique, applied in the application of stable tension/pressure to test the strength of materials and the preparation of samples for testing, can solve the problem of constant confining pressure in the height direction of the sample, and achieve a simple, significant technical and economical method. Advantages, the effect of flexible operation

Inactive Publication Date: 2014-12-17
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] Purpose of the invention: The present invention provides a loading method of gradient confining pressure, which solves the problem of constant confining pressure in the height direction of the sample in existing tests

Method used

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] A gradient confining pressure loading method, as attached figure 1 As shown, the ideal elastoplastic material layer 4 nested in the rigid cylinder 3 is squeezed by the sample 6 to indirectly realize the confining pressure loading of the sample 6. By controlling the elastic modulus of the ideal elastoplastic material layer 4 (yield stress ) gradient distribution along the height direction of the sample 6 to realize the gradient distribution of the pressure on the sample 6 in the height direction. Rigid cylinder 3 is completely rigid. The outer surface of the ideal elastic-plastic material layer 4 is in close contact with the inner surface of the rigid cylinder 3 , and the inner surface of the ideal elastic-plastic material layer 4 is in close contact with the surface of the sample 6 . The vertical gradient direction 7 of the ideal elastic-plastic material layer...

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Abstract

The invention discloses a gradient confining pressure loading method. According to the method, confining pressure loading of a sample is indirectly realized by utilizing pressure of an ideal plastic material layer embedded in a rigid cylinder, the rigid cylinder is completely rigid, and the vertical gradient direction of the ideal plastic material layer is consistent with a heterogeneous vertical gradient direction of the sample; continuous distribution or discontinuous distribution of elasticity modulus of the ideal plastic material layer along the sample height direction is controlled, so that continuous distribution or discontinuous distribution of confining pressure of the sample in the height direction can be realized; and the displacement amount of simultaneously applying pressure in a bidirectional mode in the experimental process is controlled, so that pressure gradient and average pressure stressed by the sample are kept constant. The method is simple, economic and flexible to operate, can simulate non-uniform pressure distribution stressed by rock and soil media in the actual formation indoors and has obvious technical and economic advantages.

Description

technical field [0001] The invention relates to a confining pressure loading method for a sample, in particular to a gradient confining pressure loading method. Background technique [0002] The test results of the sample under different confining pressures are the basic basis for analyzing the strength and deformation of the sample, and provide guidance for the design and construction of the on-site infrastructure. At present, there are geotechnical triaxial instruments, frozen soil triaxial instruments and rock triaxial instruments, all of which test the strength and deformation of the sample under constant confining pressure. The test results are used as the basic mechanical properties of the sample, and then the theoretical formula The derivation and calculation of numerical simulation. This processing method treats the sample as a point unit, first restores the size of the confining pressure on the site of the sample, and then applies the vertical load, but this simpli...

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Application Information

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IPC IPC(8): G01N3/08G01N1/28
Inventor 赵晓东路贵林张明赖泽金季雨坤
Owner CHINA UNIV OF MINING & TECH
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