Surrounding rock stability evaluation method based on BQ and improved Mathews stability diagram method

Abstract

A surrounding rock stability evaluation method based on BQ and an improved Mathews stability diagram method belongs to the field of goaf stability evaluation, and comprises the following steps: (1) rock mass quality calculation based on a BQ index; (2) generating and sectioning of a rock mass three-dimensional fracture network model; (3) drawing of an RQDt anisotropy diagram; (4) an optimal threshold t solving method based on BQ inversion; (5) an RQDt anisotropy solving method; (6) a crustal stress measurement method; (7) an improved method of a Mathews stability graph method; (8) an improvedMathews stability diagram evaluation method; (9) a surrounding rock stability analysis method; and (10) a goaf stability evaluation method. According to the method, the optimal threshold t and anisotropy of RQDt are solved, the Mathews stability diagram method considering anisotropy and crustal stress fitting of RQDt is improved, and goaf surrounding rock stability evaluation combining the improved Mathews stability diagram method and numerical simulation is achieved. The method is clear and suitable for goaf surrounding rock stability evaluation.

Description

technical field [0001] The present invention relates to a surrounding rock stability evaluation method based on BQ and improved Mathews stability diagram method, especially the present invention is based on BQ index, fracture network model and generalized RQD theory, inversion calculates RQD t The range of optimal threshold t and the optimal threshold t value, gives the RQD t Anisotropic solution method, and based on RQD t Anisotropy and in-situ stress fitting method, the improved method of the Mathews stability diagram method and the improved Mathews stability diagram evaluation method are given, combined with the numerical simulation method, a BQ-based, improved Mathews stability diagram method is provided The invention discloses a surrounding rock stability evaluation method, which belongs to the field of goaf stability evaluation. Background technique [0002] After a long period of underground mining in metal mines, large-scale goafs will be formed. The goafs are conn...

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

[0013] The anisotropy of RQD directly affects the quality of the rock

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