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A test method for rock mesoscopic creep failure process

A technology of creep failure and testing methods, applied in the direction of testing material strength, measuring devices, instruments, etc. by applying stable tension/compression

Active Publication Date: 2018-07-24
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] To sum up, at present, the use of SEM to study the mesoscopic characteristics of rock creep cannot fully describe the distribution and expansion of cracks with the increase of stress level in the entire creep process, so it is very necessary to propose a A test method that can comprehensively describe the rock mesoscopic creep process

Method used

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  • A test method for rock mesoscopic creep failure process
  • A test method for rock mesoscopic creep failure process
  • A test method for rock mesoscopic creep failure process

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specific Embodiment

[0044] Specific embodiment: The uniaxial compression creep test and scanning electron microscope test of marble, one of the main surrounding rocks of the deep diversion tunnel of Jinping II Hydropower Station, illustrate the testing method of the present invention.

[0045] (1) For the deeply buried marble taken from the Jinping II Hydropower Station, the original rock block was drilled and cored with a rock coring machine to obtain a long rock block with a cylindrical end face, and the long rock block was obtained with a rock cutter. The end face of the block is cut to obtain a cylindrical sample with a flat end face, and the end face of the cylindrical sample is ground with a rock grinder, so that the unevenness deviation of the two ends of the cylindrical sample is ±0.05mm, and a diameter of 50mm is obtained. Cylindrical samples with a height of 100mm, conduct acoustic wave detection on the manufactured samples, and select samples with similar wave speeds for testing;

[00...

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Abstract

The invention discloses a test method of the microcosmic creep rupture process of rock. The test method includes the steps of firstly, manufacturing standard samples for rock creep tests, and selecting the samples with close wave velocity through sound wave detection; secondly, selecting two of the samples, manufacturing into sections, and scanning with an electron microscope to obtain the initial fracture distribution conditions of the samples; thirdly, using a circulation loading and unloading manner to perform the creep tests under multiple levels of stresses, manufacturing each sample after each level of loaded stress is stabilized into a section, and scanning with the electron microscope to obtain the fracture distribution conditions and expansion rules under different loaded stresses; fourthly, statistically counting the obtained fracture images to obtain the fracture distribution conditions and the expansion rules. The test method has the advantages that the fracture distribution conditions and the expansion rules in the creep process can be reflected, the creep mechanism of the rock is researched in a microcosmic manner, and clear guiding significance is provided.

Description

technical field [0001] The invention relates to a method for testing the mesoscopic creep failure process of rock, which belongs to the field of geotechnical engineering. Background technique [0002] The creep property of rock is one of the important mechanical properties of rock, which is closely related to the long-term stability of the project. With the implementation of the western development strategy, a large number of water conservancy and hydropower projects have been built in the mountains and mountains of southwest my country. These large-scale hydropower projects play a decisive role in the rational and efficient development of my country's water energy resources. At the same time, the safety and stability of these projects, especially the long-term stability during operation, has become one of the necessary conditions to ensure the smooth development of hydropower resources. At present, in rock creep research, most of them are researched from a macro perspectiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0071
Inventor 何志磊朱珍德罗志华刘春梅孙赑
Owner HOHAI UNIV
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