Improvement method of Mathews stability diagram method based on BQ, RQDt and crustal stress

Abstract

An improvement method of a Mathews stability diagram method based on BQ, RQDt and ground stress belongs to the field of improvement of the Mathews stability diagram method, and comprises the followingsteps: (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) anoptimal threshold t solving method based on BQ inversion; (5) an RQDt anisotropy solving method; (6) a crustal stress measurement method; and (7) an improved method of a Mathews stability diagram method. According to the method, the BQ theory, the fracture network model, the generalized RQD theory and the crustal stress measurement method are combined, the optimal threshold t and anisotropy of RQDt are solved, and the Mathews stability diagram method considering anisotropy of RQDt and crustal stress fitting is improved. The method provided by the invention is clear and is suitable for improving a Mathews stability diagram method.

Description

technical field [0001] The present invention relates to a kind of based on BQ, RQD t , the improved method of the Mathews stability graph method of ground stress, especially the present invention is based on BQ index, fracture network model, generalized RQD theory and ground stress measurement method, 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 The fitting method of anisotropy and ground stress provides a method based on BQ, RQD t 1. An improved method of the Mathews stability diagram method of in-situ stress, which belongs to the method improvement field of the Mathews stability diagram method. Background technique [0002] The Mathews stability diagram method is a kind of analysis method for the stability of the surrounding rock of the mine. It is a stability diagram method based on the Q system proposed by Mathews et al in 1980 by analyzing a large number ...

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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

[0011] The anisotropy of RQD directly affects the quality of the rock

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