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Spatial RQDt solving method based on photogrammetry and RQD inversion optimal threshold t

A technology of optimal threshold and photogrammetry, which is applied in the directions of measuring devices, measuring angles, surveying and navigation, etc., can solve problems such as RQD anisotropy cannot be reflected

Inactive Publication Date: 2021-08-31
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
[0008] 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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  • Spatial RQDt solving method based on photogrammetry and RQD inversion optimal threshold t
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  • Spatial RQDt solving method based on photogrammetry and RQD inversion optimal threshold t

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Embodiment Construction

[0175] The present invention will be further described below with reference to the accompanying drawings.

[0176] refer to Figure 1 to Figure 5 , a spatial RQD based on photogrammetry and RQD inversion with an optimal threshold t t The solution method includes the following steps:

[0177] 1) Rapid acquisition of structural surface digital photogrammetry, the process is as follows:

[0178] 1.1: According to the scope and spatial position of the rock mass in the observation area, select the rock mass with well-developed surface joints and no obstacles as the photogrammetry area, and place the benchmark vertically on one side of the measurement area to calibrate the final generated 3D image the distance between any two points;

[0179] 1.2: Select an outcropping, relatively large area, and relatively smooth structural surface on the surface of the rock mass as a calibration point, use a compass to measure the inclination and inclination angle, and mark it, which is used to...

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Abstract

A spatial RQDt solving method based on photogrammetry and an RQD inversion optimal threshold t belongs to the field of RQDt anisotropy solving, and comprises the following steps of (1) quickly acquiring the digital photogrammetry of a structural plane; (2) drawing a structural plane pole diagram and a trend rose diagram; (3) calculating the rock mass mass based on an RQD index; (4) generating and sectioning a rock mass three-dimensional fracture network model; (5) drawing an RQDt anisotropy graph; (6) carrying out an optimal threshold t solving method based on RQD inversion; and (7) carrying out a spatial RQDt solving method. According to the method, photogrammetry, fuzzy equivalent clustering, an RQD theory, a fracture network model, a generalized RQD theory and a conic curve equation are combined, and the solving of the optimal threshold value t of RQDt and the drawing of an RQDt elliptic curve and an anisotropic ellipsoid under the optimal threshold value t are achieved. The method is clear, the obtained optimal threshold value t, the elliptic curve and the anisotropic ellipsoid can reflect the anisotropic characteristics of the RQDt of the real rock mass, and the method is suitable for solving the spatial anisotropy of the RQDt of the rock mass.

Description

technical field [0001] The present invention relates to a spatial RQD based on photogrammetry and RQD inversion optimal threshold t t The solution method, especially the present invention is based on photogrammetry, fuzzy equivalent clustering, RQD index, crack network model, generalized RQD theory and conic section 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 curves and anisotropic ellipsoids, providing a spatial RQD based on photogrammetry and RQD inversion with an optimal threshold t t Solving method, belonging to RQD t Anisotropic solution field. Background technique [0002] In nature, RQD is an important index to characterize the quality of rock mass, and RQD has anisotropy. The anisotropy of RQD can also be seen from the expansion of the calculation formula from borehole RQD to generalized RQD. Deer proposed the concept of borehole RQD in 196...

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Application Information

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IPC IPC(8): G01C1/00
CPCG01C1/00
Inventor 胡高建
Owner SHAOXING UNIVERSITY
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