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BQ and RQDt-based roadway excavation unfavorable orientation solving method

A roadway, unfavorable technology, applied in the field of solving the unfavorable azimuth of roadway excavation based on BQ and RQDt, can solve the problems that cannot reflect the anisotropy of RQD

Inactive Publication Date: 2020-12-25
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

Method used

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  • BQ and RQDt-based roadway excavation unfavorable orientation solving method
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  • BQ and RQDt-based roadway excavation unfavorable orientation solving method

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Embodiment Construction

[0171] The present invention will be further described below with reference to the accompanying drawings.

[0172] refer to Figure 1 to Figure 4 , a BQ and RQD based t The method for solving the unfavorable azimuth of roadway excavation includes the following steps:

[0173] 1) Calculation of rock mass quality based on BQ index, the process is as follows:

[0174] 1.1: Calculate the rock mass integrity coefficient according to structural surface parameters, the formula is as follows:

[0175]

[0176] In the formula: Jv is the number of rock mass volume joints, unit bar / m 3 ;

[0177] 1.2: The calculation formula of Jv is as follows:

[0178]

[0179] 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;

[0180] 1.3: Calculate the BQ value according to the uniaxial compressive strength value of the rock and the integrity coefficient value...

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Abstract

The invention relates to a BQ and RQDt-based roadway excavation unfavorable orientation solving method, which belongs to the field of roadway excavation orientations, and comprises the following steps: (1) calculating rock mass quality 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 method based on BQ inversion; (5) performing a space RQDt solving method; and (6) performing a roadway excavation unfavorable orientation solving method. According to the invention, the BQ theory, the fracture network model, the generalized RQD theory and the conic curve equation are combined, the optimal threshold t of RQDt is solved, the RQDt elliptic curve and the anisotropic ellipsoid are drawn, and the roadway excavation unfavorable orientation under the optimal threshold t is solved. The method is clear, the obtained optimal threshold t, elliptic curve and anisotropic ellipsoid can accurately reflect the RQDt anisotropic characteristics of the rock mass, and the obtained roadway excavation adverse orientation can be used for guiding roadway excavation construction application.

Description

technical field [0001] The present invention relates to a kind of based on BQ and RQD t The unfavorable azimuth solution method of roadway excavation, especially the present invention is based on BQ index, fracture network model, generalized RQD theory and conic curve equation, inversion calculates RQD t The range of the optimal threshold t and the value of the optimal threshold t get the RQD under the optimal threshold t t Elliptic curve and anisotropic ellipsoid, the unfavorable orientation of roadway excavation under the optimal threshold t is obtained, and a method based on BQ and RQD is provided t The method for solving unfavorable azimuths of roadway excavation belongs to the field of roadway excavation azimuths. 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...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06F30/20G06F30/13G06F7/58G06T11/20G06T17/00
CPCG06F7/588G06Q10/06393G06Q10/06395G06T11/203G06T11/206G06T17/00G06F30/13G06F30/20
Inventor 胡高建
Owner SHAOXING UNIVERSITY
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