Method for testing three-dimensional ground stress by aid of acoustic emission processes

A test method, the technology of acoustic emission method, applied in the direction of applying stable tension/pressure to test material strength, measuring force, measuring device, etc., can solve problems affecting popularization and application, difficult identification of Kaiser effect points, fixed sampling angle, etc.

Inactive Publication Date: 2016-10-12
CHONGQING UNIV
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Problems solved by technology

[0009] However, due to the poor propagation of sound waves in plastic rock mass, which affects the acoustic emission Kaiser effect of plastic rock mass, this method cannot be applied to plastic rock mass.
Moreover, there are still some deficiencies in the precise identification method of Kaiser effect points and the calculation method of Kaiser effect ground stress, which affects the popularization and application of this method.
On the other hand, the existing acoustic emission methods usually have fixed r

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  • Method for testing three-dimensional ground stress by aid of acoustic emission processes
  • Method for testing three-dimensional ground stress by aid of acoustic emission processes
  • Method for testing three-dimensional ground stress by aid of acoustic emission processes

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Embodiment Construction

[0074] The present invention will be further described below in conjunction with the drawings and embodiments:

[0075] Such as figure 1 As shown, an acoustic emission method for three-dimensional in-situ stress testing is characterized by the following steps:

[0076] 1) Sampling and processing

[0077] Establish an oxyz coordinate system near the underground roadway or tunnel face 101, such as figure 2 As shown, the geological compass is used to measure its direction; in the x-direction, y-direction, z-direction, xy-plane, xz-plane, and yz-plane, several cores are drilled into the rock formation; the geological compass is used for each sampling point The direction is measured and recorded.

[0078] The sampling depth is required to be more than 2.5 times the width of the roadway or tunnel, the core diameter is at least 50mm, and the length is at least 100mm. Number the direction of the test piece, package it and transport it back to the laboratory, use a rock cutter, end grinder,...

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Abstract

The invention discloses a three-dimensional in-situ stress testing method by acoustic emission method, comprising the following steps: 1) sampling and processing; 2) uniaxial acoustic emission test; 3) drawing a stress-accumulated acoustic emission ringing count-time curve; 4) Quickly discriminate the Kaiser effect points; 5) Calculate the three-dimensional stress state of the in-situ stress measuring points. The rock specimen sampling direction angle of the invention is flexible, the Kaiser effect point identification is quick and easy, the error in the calculation result of the in-situ stress caused by the deviation of the sampling angle is reduced, and the accuracy of the original rock stress test is also ensured.

Description

Technical field [0001] The invention relates to a method for testing ground stress, in particular to a method for three-dimensional ground stress testing using acoustic emission. Background technique [0002] When the material is subjected to an external load, the strain energy stored in the material is quickly released to produce elastic waves and sound, which is called acoustic emission. In 1959, EJKaiser found that after the stress of polycrystalline metal was released from its highest level in history, after reloading, when the stress did not reach the previous maximum stress, there was little acoustic emission, and when the stress reached the previous maximum stress or exceeded it, it would occur. A large amount of acoustic emission, this phenomenon is called the Kaiser effect, and the turning point from little acoustic emission to a large amount of acoustic emission is called the Kaiser point. Later, R.E. Goodman proved that the rock also has the Kaiser effect during the l...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01L1/25
CPCG01N3/12G01L1/255G01N2203/0017
Inventor 张东明白鑫许江尹光志张先萌郑彬彬杨玉顺赵雪平贾同千樊增瑞
Owner CHONGQING UNIV
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