Method for objectively determining crack initiation strength of rock on basis of accumulated sound emission impact times

A technology of crack initiation strength and acoustic emission, applied in the direction of strength characteristics, the use of stable tension/pressure test material strength, measuring devices, etc., can solve problems such as interference with accurate identification of crack initiation strength values, save test time, and facilitate Promote the application and ensure the effect of uniqueness

Active Publication Date: 2014-04-30
BEIJING RES INST OF URANIUM GEOLOGY
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Problems solved by technology

However, due to the high sensitivity of the acoustic emission monitoring signal to the mechanical response of the rock and the interference of background noise, the rock may also detect a stron

Method used

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  • Method for objectively determining crack initiation strength of rock on basis of accumulated sound emission impact times
  • Method for objectively determining crack initiation strength of rock on basis of accumulated sound emission impact times
  • Method for objectively determining crack initiation strength of rock on basis of accumulated sound emission impact times

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Embodiment Construction

[0045] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0046] Such as figure 1 As shown, a method for objectively determining rock crack initiation strength based on the accumulated acoustic emission impact number includes the following steps in turn:

[0047] Step S1: Processing the complete core drilled on site to prepare a cylindrical rock specimen;

[0048] Step S2: Install the rock sample on the sample table of the press, and install the acoustic emission sensor in the middle of the rock sample. Usually, the piezoelectric ceramic surface of the acoustic emission sensor is in direct contact with the surface of the test piece, and the contact surface is coated with a thin layer Petroleum jelly as coupling agent;

[0049] Step S3: Perform uniaxial loading on the rock specimen, keep the acoustic emission monitoring and the loading process synchronized, and collect the axial stress and the accum...

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Abstract

The invention belongs to the field of rock performance tests and specifically relates to a method for objectively determining crack initiation strength of a rock based on accumulated sound emission impact times. The purpose is to accurately identify the crack initiation strength value. The method comprises the followings: preparing a cylindrical rock test piece, installing the rock test piece on a test sample table of a press machine, installing a sound emission sensor in the middle part of a rock sample, uniaxially loading the rock test piece, synchronizing the sound emission monitoring and the loading process, acquiring the data of axial stress and accumulated sound emission impact times in real time, acquiring a curve of the accumulated sound emission impact times changing along with the time, drawing a curve of the relation between the axial stress and the accumulated sound emission impact times, calculating the difference of the accumulated sound emission impact times according to the relation curve, and drawing a relation schema of the difference of the accumulated sound emission impact times and the axial stress, wherein the stress corresponding to the peak of the difference of the accumulated sound emission impact times is the crack initiation strength of the rock. The method eliminates the subjective judgment of a user, and guarantees the uniqueness of the solution.

Description

technical field [0001] The invention belongs to the field of rock performance testing, and in particular relates to a method for objectively determining rock crack initiation strength based on accumulated acoustic emission impact numbers. Background technique [0002] The mechanical failure process of rock is the process of initiation, expansion and penetration of internal micro-cracks. The damage and failure process under compression can be divided into several important stages: (1) crack closure; (2) elastic deformation; (3) crack initiation; (4) crack stable development; (5) crack penetration; (6) Unsteady fracture development; (7) Destruction; (8) Post-destruction stage. Among them, the stress level corresponding to the initial crack is called rock crack initiation strength. Crack initiation strength (σci) is one of the important characteristic stress values ​​of rock in the process of compression failure. Reasonable determination of this stress value is of great signi...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/06
Inventor 赵星光李鹏飞马利科谢敬礼宗自华苏锐王驹
Owner BEIJING RES INST OF URANIUM GEOLOGY
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