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Method for testing and evaluating mechanical heterogeneity of rock

An evaluation method and technology of rock mechanics, applied in the application of stable tension/pressure to test the strength of materials, preparation of test samples, measurement devices, etc., which can solve problems such as inability to deeply characterize rock mechanics heterogeneity.

Pending Publication Date: 2021-07-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that the existing rock heterogeneity evaluation method cannot deeply characterize the mechanical heterogeneity of rock internal materials, the present invention aims to provide a rock mechanical heterogeneity test and evaluation method, which is used to solve the problems in the prior art. The above problems

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  • Method for testing and evaluating mechanical heterogeneity of rock
  • Method for testing and evaluating mechanical heterogeneity of rock
  • Method for testing and evaluating mechanical heterogeneity of rock

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preparation example Construction

[0053] (3) Preparation of rock sample 1: the rock core column obtained in step (2) is processed, and uniformly processed according to rock mechanics test standards to obtain the disc-shaped rock with a diameter of 25 to 75 mm and a thickness of 10 to 40 mm sample. In the present invention, the preferred processing diameter is 50mm, and the thickness is 25mm disc-shaped described rock sample 1;

[0054] (4) According to the stress characteristics of the rock sample 1 under the splitting experiment, the rock sample 1 obtained in step (3) is divided into regions, and the experimental area and stress concentration are marked. The force 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. Only under the condition of equal tensile force, the difference in mechanical heterogeneity of rock samples can be evaluated by observing the deformation difference of a small area in the experimental...

Embodiment 1

[0070] The present invention takes the metagabbro in the deep well construction area as an example, and its method comprises the steps:

[0071] A1: Find out in detail the address structure of the formation where the metagabbro is located, select the evaluation area, and ensure that the core is well representative;

[0072] A2: Find out in detail the lithology, engineering characteristics, and weathering degree of the metagabbro, and evaluate the quality grade of the surrounding rock;

[0073] 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;

[0074] 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;

[0075] A5: Divide ...

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Abstract

The invention relates to a method for testing and evaluating the mechanical heterogeneity of a rock. The method comprises the following steps: firstly, selecting a stratum to be tested; secondly, drilling the stratum to be tested to obtain a rock core column; secondly, processing the rock core column to obtain a rock sample; secondly, carrying out regional division on the rock sample; secondly, arranging a certain number of strain gauges on the rock sample, and recording data measured by the strain gauges under the splitting condition; and finally, calculating a mean value, a standard deviation and a variable coefficient according to the recorded data, and evaluating the mechanical heterogeneity of the rock according to the variable coefficient. According to the method, the mechanical response heterogeneity characteristic of the rock is obtained according to the dispersion of deformation under the same stress condition; 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. 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 method, logging identifica...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N3/08G01N3/02
CPCG01N1/28G01N3/08G01N3/02
Inventor 纪洪广苏晓波张洲权道路耿景明
Owner UNIV OF SCI & TECH BEIJING