RQDt optimal threshold t solving method based on BQ inversion

Abstract

An RQDt optimal threshold t solving method based on BQ inversion belongs to the RQDt optimal threshold t solving field, and comprises the following steps: (1) performing rock mass quality calculationbased on a BQ index; (2) generating and sectioning a rock mass three-dimensional fracture network model; (3) drawing an RQDt anisotropy diagram; and (4) an optimal threshold t solving method based onBQ inversion. According to the invention, the BQ theory, the fracture network model, the generalized RQD theory and inversion calculation are combined, the optimal threshold t of RQDt is solved, and the RQDt optimal threshold t solving method based on BQ inversion is provided. The method is clear, the obtained threshold t can reflect the real rock mass quality, and the method is suitable for solving the optimal threshold t of the rock mass RQDt.

Description

technical field [0001] The invention relates to a RQD based on BQ inversion t The optimal threshold t solution method, especially the present invention is based on the BQ index, the crack network model and the generalized RQD theory, and calculates the RQD by inversion t The range of optimal threshold t and the optimal threshold t value, providing a RQD based on BQ inversion t Optimal threshold t solution method, belonging to RQD t The optimal threshold t for solving the field. Background technique [0002] In nature, RQD is an important index to characterize the quality of rock mass, and RQD has anisotropy. The anisotropy of RQD can also be seen from the expansion of the calculation formula from borehole RQD to generalized RQD. 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 o...

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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

The research on the optimal threshold t in these two aspects has certain limitations in the applicable conditions. It is a method of solving the optimal threshold t in a specific theory and background. When the background or model changes, the optimal The threshold t will no longer be optimal

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