Goaf stability evaluation method based on photogrammetry, BQ and improved Mathews stability diagram

Abstract

A goaf stability evaluation method based on photogrammetry, BQ and an improved Mathews stability diagram belongs to the field of goaf stability evaluation, and comprises the following steps: (1) quickacquiring of structural plane digital photogrammetry; (2) structural plane fuzzy equivalent clustering analysis; (3) rock mass quality calculation based on a BQ index; (4) generating and sectioning of a rock mass three-dimensional fracture network model; (5) drawing of an RQDt anisotropy diagram; (6) an optimal threshold t solving method based on BQ inversion; (7) an RQDt anisotropy solving method; (8) an improved method of a Mathews stability graph method; (9) an improved Mathews stability diagram evaluation method; (10) a surrounding rock stability analysis method; and (11) a goaf stabilityevaluation method. According to the method, the optimal threshold t of the RQDt, the anisotropism solving of the RQDt and the improvement of the Mathews stability diagram method are realized, and thegoaf surrounding rock stability evaluation combining the improved Mathews stability diagram method and numerical simulation is realized. The method is clear and suitable for goaf surrounding rock stability evaluation.

Description

Technical field[0001]The present invention relates to a method for evaluating empty space stability based on photogrammetry, BQ, and improved Mathews stability map. In particular, the present invention is based on photogrammetry, fuzzy equivalence analysis, BQ index, fracture network model and generalized RQD theory, inversion Calculate RQDtThe range of the optimal threshold t and the optimal threshold t value give RQDtAnisotropic solution method, and based on RQDtThe improved method of Mathews stability map method and the improved evaluation method of Mathews stability map are given. Combined with the numerical simulation method, a method based on photogrammetry, BQ and improved Mathews stability map is provided. The evaluation method belongs to the field of stability evaluation of the goaf.Background technique[0002]After a long period of underground mining in metal mines, large-scale mined-out areas will be formed. The mined-out areas are interconnected, overlapped and concentrate...

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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

[0013] 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 given the calculation method of the optimal threshold t, so the RQD based on the optimal threshold t has not been obtained. t Anisotropy calculation formula, and the RQD that can best reflect the quality of rock mass has not yet been obtained t Anisotropy solution method

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