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Improved Mathews stability diagram evaluation method based on BQ and RQDt anisotropy

An anisotropy and evaluation method technology, applied to the generation of 2D images, the use of stable tension/pressure test material strength, 3D modeling, etc., can solve the problem of not reflecting RQD anisotropy, not getting anisotropy Problems such as calculation formulas and methods for solving anisotropy have not yet been obtained

Inactive Publication Date: 2021-01-08
SHAOXING UNIVERSITY
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Problems solved by technology

Deer proposed the concept of borehole RQD in 1964. Due to the following two shortcomings in the application of borehole RQD: whether the threshold value of 100 mm is reasonable for different engineering scale rock masses; the drilling direction of the borehole is limited, and the obtained RQD can only reflect local rock mass conditions, but cannot reflect RQD anisotropy
[0010] The anisotropy of RQD directly affects the quality of the rock mass, and the mechanism of the influence of RQD anisotropy on the quality of the rock mass has not yet been explored clearly
In terms of the threshold t, no scholars have given the calculation method of the optimal threshold t, so the RQD based on the optimal threshold t has not been obtained. t Anisotropy calculation formula, and the RQD that can best reflect the quality of rock mass has not yet been obtained t Anisotropy solution method

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  • Improved Mathews stability diagram evaluation method based on BQ and RQDt anisotropy
  • Improved Mathews stability diagram evaluation method based on BQ and RQDt anisotropy
  • Improved Mathews stability diagram evaluation method based on BQ and RQDt anisotropy

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Embodiment Construction

[0165] The present invention will be further described below with reference to the accompanying drawings.

[0166] refer to Figure 1 to Figure 5 , a BQ, RQD based t Anisotropic improved Mathews stability map evaluation method, including the following steps:

[0167] 1) Calculation of rock mass quality based on BQ index, the process is as follows:

[0168] 1.1: Calculate the rock mass integrity coefficient according to structural surface parameters, the formula is as follows:

[0169]

[0170] In the formula: Jv is the number of rock mass volume joints, unit bar / m 3 ;

[0171] 1.2: The calculation formula of Jv is as follows:

[0172]

[0173] In the formula: L1, L2, ..., Ln are the lengths of the measuring lines perpendicular to the structural plane; N1, N2, ..., Nn are the number of structural planes in the same group;

[0174] 1.3: Calculate the BQ value according to the uniaxial compressive strength value of the rock and the integrity coefficient value of the r...

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Abstract

An improved Mathews stability diagram evaluation method based on BQ and RQDt anisotropy belongs to the field of Mathews stability diagram evaluation methods, and comprises the following steps: (1) rock mass quality calculation based on BQ indexes; (2) generating and sectioning of a rock mass three-dimensional fracture network model; (3) drawing of an RQDt anisotropy diagram; (4) an optimal threshold t solving method based on BQ inversion; (5) an RQDt anisotropy solving method; (6) an improved method of a Mathews stability diagram method; and (7) an improved Mathews stability diagram evaluationmethod. According to the method, the BQ theory, the fracture network model, the generalized RQD theory and inversion calculation are combined, the optimal threshold t of the RQDt and the anisotropy of the RQDt are solved, and the improved Mathews stability diagram method mine room stability evaluation considering the anisotropy of the RQDt is achieved. The method is clear and suitable for evaluating the stability of the mine room surrounding rock.

Description

technical field [0001] The present invention relates to a kind of based on BQ, RQD t Anisotropic improved Mathews stability map evaluation method, especially the present invention is based on BQ index, crack network model and generalized RQD theory, and calculates RQD by inversion t The range of optimal threshold t and the optimal threshold t value, gives the RQD t Anisotropic solution method, and based on RQD t The anisotropy of the Mathews stable graph method is given, and a method based on BQ and RQD is provided t An anisotropic improved Mathews stable graph evaluation method belongs to the field of Mathews stable graph evaluation methods. Background technique [0002] The Mathews stability diagram method is a kind of analysis method for the stability of the surrounding rock of the mine. It is a stability diagram method based on the Q system proposed by Mathews et al in 1980 by analyzing a large number of engineering examples. The Mathews stability diagram method main...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/06G01B11/25G01N3/08G06F7/58G06F30/13G06F30/20G06K9/62G06T11/20G06T17/00G06F119/14
CPCG06Q10/06393G06Q10/06395G06F30/20G06T17/00G06F7/588G06T11/203G06T11/206G06F30/13G01N3/08G01B11/2518G01N2203/0252G01N2203/0647G06F2119/14G06F18/22G06F18/23
Inventor 胡高建
Owner SHAOXING UNIVERSITY
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