BQ and RQDt-based roadway excavation unfavorable orientation solving method

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...

AI Technical Summary

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

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