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RQDt anisotropy solving method based on BQ and optimal threshold t

An anisotropy and optimal threshold technology, applied in the field of RQDt anisotropy solution method, can solve the problem that RQD anisotropy cannot be reflected, RQD anisotropy solution method has not been obtained, RQD anisotropy calculation formula has not been obtained, etc. question

Inactive Publication Date: 2020-12-22
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
[0009] 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 yet given a calculation method for the optimal threshold t, so the calculation formula of RQD anisotropy based on the optimal threshold t has not been obtained, and the RQD parameters that can best reflect the quality of the rock mass have not yet been obtained. Anisotropic solution method

Method used

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  • RQDt anisotropy solving method based on BQ and optimal threshold t
  • RQDt anisotropy solving method based on BQ and optimal threshold t
  • RQDt anisotropy solving method based on BQ and optimal threshold t

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Embodiment Construction

[0151] The present invention will be further described below with reference to the accompanying drawings.

[0152] refer to Figure 1 to Figure 4 , a BQ-based RQD with an optimal threshold t t An anisotropic solution method, including the following steps:

[0153] 1) Calculation of rock mass quality based on BQ index, the process is as follows:

[0154] 1.1: Calculate the rock mass integrity coefficient according to structural surface parameters, the formula is as follows:

[0155]

[0156] In the formula: Jv is the number of rock mass volume joints, unit bar / m 3 ;

[0157] 1.2: The calculation formula of Jv is as follows:

[0158]

[0159] 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;

[0160] 1.3: Calculate the BQ value according to the uniaxial compressive strength value of the rock and the integrity coefficient value of the rock...

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Abstract

An RQDt anisotropy solving method based on BQ and an optimal threshold t belongs to the field of RQDt anisotropy solving, and comprises the following steps: (1) performing rock mass quality calculation based on a BQ index; (2) generating and sectioning a rock mass three-dimensional fracture network model; (3) drawing an RQDt anisotropy diagram; (4) performing an optimal threshold t solving methodbased on BQ inversion; and (5) performing an RQDt anisotropy solving method. According to the invention, the BQ theory, the fracture network model, the generalized RQD theory and inversion calculationare combined, the optimal threshold t and anisotropism of RQDt are solved, and the RQDt anisotropism solving method based on BQ and the optimal threshold t is provided. The method is clear, and is suitable for anisotropic solution of rock mass RQDt.

Description

technical field [0001] The present invention relates to a RQD based on BQ and optimal threshold t t Anisotropy solution method, especially the present invention is based on BQ index, fracture network model and generalized RQD theory, inversely calculates RQD t The range of optimal threshold t and the optimal threshold t value, gives the RQD t Anisotropic solution method, providing a RQD based on BQ and optimal threshold t t Anisotropic solution method, belonging to RQD t Anisotropic solution field. Background technique [0002] In nature, anisotropy is ubiquitous. Rock masses exhibit very pronounced anisotropy, with properties that vary with viewing angle and measurement direction. The origin of rock anisotropy changes can be attributed to geological origin, such as unique bedding in sedimentary rocks, unique natural pores in basalt, gneiss structure in gneiss and cleavage in slate, and through these rock faults, etc. In addition to the anisotropy of the rock mass cau...

Claims

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Application Information

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IPC IPC(8): G06F17/10G01N3/08
CPCG01N3/08G01N2203/0252G06F17/10
Inventor 胡高建
Owner SHAOXING UNIVERSITY
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