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Method for testing and evaluating mechanical heterogeneity of rock based on acoustic emission

An evaluation method and technology of rock mechanics, applied in the direction of applying stable tension/pressure to test material strength, using acoustic wave emission technology for material analysis, measuring devices, etc., can solve the problem of inability to deeply characterize the mechanical heterogeneity of rock internal materials, etc. problems, to achieve the effect of promoting evaluation and classification, simple calculation, and convenient production

Active Publication Date: 2021-08-03
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

[0005] Aiming at the problem that the existing rock heterogeneity evaluation methods cannot deeply characterize the mechanical heterogeneity of rock internal materials, the present invention aims to provide a method for testing and evaluating rock mechanical heterogeneity based on acoustic emission, which is used to solve the problem of The above-mentioned problems existing in the prior art

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  • Method for testing and evaluating mechanical heterogeneity of rock based on acoustic emission
  • Method for testing and evaluating mechanical heterogeneity of rock based on acoustic emission
  • Method for testing and evaluating mechanical heterogeneity of rock based on acoustic emission

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preparation example Construction

[0054](3) Preparation of rock sample: the rock core column obtained in step (2) is processed, and uniformly processed according to the rock mechanics test standard to obtain the disc-shaped rock sample with a diameter of 25 to 75 mm and a thickness of 10 to 40 mm. Sample. In the present invention, preferably processing diameter is 50mm, and thickness is the described rock sample of 25mm disk shape;

[0055] (4) According to the mechanical characteristics of the rock sample under the splitting test, the stress on the top and bottom of the rock is concentrated, and the stress gradient is large. The central axis is far away from the top and bottom areas, and the tensile stress is almost equal. Under the condition of equal tensile force, the components near the central axis of the rock will gradually break from weak phase to strong phase, so the proportion of the fractured components of the rock sample can be calculated. coefficient, further calculate the rock heterogeneity coeff...

Embodiment 1

[0066] The method of the present invention is applied to the granite experimental object in the deep well construction area, and comprises the following steps:

[0067] A1: Find out in detail the geological structure of the formation where the granite is located, select the evaluation area, and ensure that the core is well representative;

[0068] A2: Find out in detail the lithology, engineering characteristics, and weathering degree of the granite, and evaluate the quality grade of the surrounding rock;

[0069] A3: Carry out vertical drilling and coring for the stratum to be evaluated for homogeneity, and continuously take 5 core pillars with a length of 20-30 cm, and the sampling distance of each core pillar in the same stratum shall not exceed 50 cm;

[0070] A4: Process the core column obtained in the above steps, and uniformly process it into a disc rock sample with a diameter of 50 mm and a thickness of 25 mm, thereby obtaining multiple split disc-shaped rock samples; ...

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Abstract

The invention relates to a method for testing and evaluating the mechanical heterogeneity of rock based on acoustic emission, which comprises the steps of firstly, selecting a complete stratum to be tested; secondly, drilling the to-be-detected complete stratum to obtain a rock core column; then, processing the rock core column to obtain a rock sample; then, arranging acoustic emission sensors on the two sides of the rock sample; then, recording data measured by the acoustic emission sensors in the splitting experiment process, counting the number of acoustic emission signal events according to the recorded data, and calculating the total number of acoustic emission events, the fracture component proportion coefficient of the rock sample and the heterogeneous coefficient of the rock; and evaluating the mechanical heterogeneity of the rock by using the heterogeneity coefficient of the rock. According to the method, the mechanical response heterogeneity characteristic of the rock is obtained according to the heterogeneity coefficient; and the rock sample is convenient to manufacture, simple in calculation and high in practicability, quantitative evaluation of the heterogeneity in the rock is facilitated, and evaluation and classification of the quality of surrounding rock of underground engineering are promoted.

Description

technical field [0001] The invention belongs to the field of testing characteristics of rock mechanics heterogeneity in deep underground engineering, and in particular relates to a method for testing and evaluating rock mechanics heterogeneity based on acoustic emission. Background technique [0002] Heterogeneity is an important indicator for evaluating the strength, deformation and self-storage capacity of rock materials, especially for deep underground engineering, under different engineering background conditions, there are different requirements for the degree of heterogeneity of rock materials . For example, the requirements for rock materials in underground anti-shock engineering are high strength but prominent damage cascades, which requires outstanding heterogeneity of rock materials, thereby avoiding rockburst dynamic damage in surrounding rocks. [0003] The evaluation of rock heterogeneity at home and abroad mainly includes core observation method, X-CT scanning...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N3/06G01N29/14
CPCG01N3/08G01N3/06G01N29/14G01N2203/0019G01N2203/0067G01N2203/0658
Inventor 纪洪广张洲苏晓波张月征权道路
Owner UNIV OF SCI & TECH BEIJING
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