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

Abstract

The invention discloses a goaf stability evaluation method based on laser scanning, BQ and an improved Mathews stability diagram, and belongs to the field of goaf stability evaluation, and the methodcomprises the following steps: (1) quick obtaining of structural surface three-dimensional laser scanning; (2) structural plane 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 improving 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 stability evaluation method. According to the method, the optimal threshold t of the RQDt, the anisotropism solving of the RQDt and the improvement of the Mathews stabilitydiagram method are realized, and the goaf 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 the stability of empty space based on laser scanning, BQ, and improved Mathews stability map. In particular, the present invention is based on three-dimensional laser scanning, nearest neighbor propagation algorithm, 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 diagram and the improved evaluation method of Mathews stability diagram are given. Combined with the numerical simulation method, a method based on laser scanning, BQ, and improved Mathews stability diagram 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...

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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 the local rock mass conditions, but cannot reflect the 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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