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Roadway excavation unfavorable orientation solving method based on RQD and RQDt

An unfavorable technology for roadway, applied in the field of roadway excavation unfavorable orientation solution based on RQD and RQDt, which can solve the problem of not reflecting the anisotropy of RQD

Inactive Publication Date: 2021-03-09
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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  • Roadway excavation unfavorable orientation solving method based on RQD and RQDt

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Embodiment Construction

[0155] The present invention will be further described below with reference to the accompanying drawings.

[0156] refer to Figure 1 ~ Figure 4 , a method based on RQD and RQD t The method for solving the unfavorable azimuth of roadway excavation includes the following steps:

[0157] 1) Calculation of rock mass quality based on RQD index, the process is as follows:

[0158] 1.1: Select the rotary drilling method according to the geotechnical category and survey requirements;

[0159] 1.2: Using 75mm caliber N-type double-layer core tube and diamond drill bit, the drilling caliber and drilling tool specifications comply with the current national standards, and the hole caliber meets the requirements of sampling, testing and drilling technology;

[0160] 1.3: According to the designed drilling position, the handheld GPS measurement is used for field positioning. After the drilling is completed, the GPS is used for formal and accurate measurement;

[0161] 1.4: During the d...

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Abstract

The invention relates to a roadway excavation adverse orientation solving method based on RQD and RQDt, and belongs to the field of roadway excavation orientations, and the method comprises the following steps: (1) making rock mass quality calculation based on RQD indexes; (2) generating and sectioning a rock mass three-dimensional fracture network model; (3) drawing an RQDt anisotropy diagram; (4) arranging an optimal threshold t solving method based on RQD inversion; (5) arranging a space RQDt solving method; and (6)arranging a roadway excavation unfavorable orientation solving method. The RQD 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 RQD and RQD t The unfavorable azimuth solution method of roadway excavation, especially the present invention is based on the RQD index, fracture network model, generalized RQD theory and conic curve equation, and calculates the 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, get the unfavorable orientation of roadway excavation under the optimal threshold t, and provide a method based on RQD and RQD 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 origin...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06T17/00G06T11/20G06Q10/06
CPCG06Q10/06395G06T11/20G06T17/00G06F30/20
Inventor 胡高建
Owner SHAOXING UNIVERSITY
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