Method of determining long-term strength in rock creep tests

A technique for creep testing, long-term strength, applied in the field of geotechnical engineering

Inactive Publication Date: 2018-06-12
LIAONING TECHNICAL UNIVERSITY
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[0006] In summary, the existing methods for jud

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  • Method of determining long-term strength in rock creep tests
  • Method of determining long-term strength in rock creep tests
  • Method of determining long-term strength in rock creep tests

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[0043] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0044] A method for determining long-term strength in rock creep tests, the procedure is as follows figure 1 As shown, the specific method is as follows:

[0045] Step 1: Trim the rock sample that has been simply cut on site with a cutting machine so that it can be placed on the coring machine.

[0046] Step 2: Use a coring machine to core the rock sample using the water drilling method. The processing accuracy is strictly in accordance with the "Standard for Rock Test Methods" (GB50218-94), so that the shape of the core is a cylinder with a diameter of 50mm and a height of 100mm. Use a cutting machine to cut and g...

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Abstract

The invention provides a method of determining long-term strength in rock creep tests, and relates to the technical field of rock mechanics. The method includes coring field rock samples; processing rock cores to form test pieces; mounting and adjusting axial and radial displacement sensors for the test pieces; applying axial and radial load to the test pieces until the text pieces are destroyed;acquiring test data, and converting and outputting the test dada; plotting axial and radial creep curves of the test pieces; computing creep Poisson ratios at various moments; determining the long-term strength of rock. The method for determining the long-term strength in the rock creep tests has the advantages that influence of axial and radial deformation in the rock creep procedures on the performance of the rock is comprehensively considered according to actual ductile dilation deformation of the rock, the creep time is segmented, creep Poisson ratio -time curves are plotted, the long-termstrength of the rock is determined according to stress corresponding to data of inflection points of the curves, accordingly, the timeliness of the rock can be effectively reflected by the solved long-term strength, subjective judgment can be eliminated, and the method is simple and reliable, is high in accuracy and is easy to popularize and apply to actual rock engineering.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering, in particular to a method for determining long-term strength in rock creep tests. Background technique [0002] With the increasing depth of underground and tunnel engineering, the geotechnical problems involved in complex geological environment conditions are becoming more and more complex, which brings unprecedented problems and challenges to rock engineering. When the depth of the deep rock mass is greater than the critical softening depth, the deep rock mass will exhibit complex soft rock deformation characteristics under the interaction of gravity, tectonic stress, underground flowing water, and engineering disturbance. Because soft rock is affected by ground stress, surrounding rock unloading, seepage, and structural stress, the soft rock's unfavorable properties such as weakness, fragmentation, looseness, expansion, rheology, and strong weathering have led to increasing en...

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Application Information

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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0019G01N2203/0071G01N2203/0256
Inventor 洪淼梁艺韩宝红
Owner LIAONING TECHNICAL UNIVERSITY
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