Digital drilling real-time classification method for surrounding rock of underground engineering

Abstract

The invention discloses a digital drilling real-time classification method for a surrounding rock of underground engineering. The method comprises the following steps: making a field drilling test onan underground engineering field to obtain a drilling parameter, obtaining uniaxial compressive strength of a rock body through a model of relationships between drilling parameters and uniaxial compressive strength of rock bodies, obtaining a rock body breaking coefficient on the basis of a model of relationships between drilling parameters and rock body breaking coefficients, obtaining equivalentuniaxial compressive strength from the uniaxial compressive strength of the rock body and the rock body breaking coefficient by use of a uniaxial compressive strength correction formula, obtaining displacement of the surrounding rock by use of a model of relationships between equivalent uniaxial compressive strength and displacement of surrounding rocks, and further classifying the surrounding rock in real time according to the displacement of the surrounding rock. The method has the characteristic of real-time accurate prediction; the displacement of the surrounding rock is reversely deducedaccording to the drilling parameter obtained in field, thereby accurately classifying the surrounding rock in real time by use of the stability of the surrounding rock and providing a basis for design and construction of underground engineering; disturbance in a process of delivering a rock sample to a laboratory is avoided, meanwhile, the test time is shortened to a great extent and manpower andmaterial resources are saved.

Description

technical field [0001] The invention relates to the technical field of safety in underground engineering, in particular to a real-time grading method for digital drilling of surrounding rock in underground engineering. Background technique [0002] At present, surrounding rock classification is the basic work of underground engineering design and construction. At present, the commonly used surrounding rock classification methods include BQ classification method, RMR classification method, etc., but they have the following defects: [0003] (1) The BQ classification method requires on-site coring to be transported indoors for uniaxial testing, which consumes a lot of time and manpower. At the same time, the classification using BQ classification method requires a large number of parameters, and the calculation is complicated. The surrounding rock can only be divided into six levels according to the BQ classification method, which is relatively general and cannot accurately ...

AI Technical Summary

Problems solved by technology

[0003] (1) The BQ classification method requires on-site coring and transportation to the room for uniaxial testing, which consumes a lot of time and manpower

At the same time, using the BQ classification method requires a large number of parameters, and the calculation is complicated

The surrounding rock can only be divided into six levels according to the BQ classification method, which is relatively general and cannot accurately reflect the real situation of the surrounding rock

[0004] (2) The classification indicators of the RMR classification method are relatively general, and it is impossible to accurately classify the surrounding rocks

[0005] To sum up, in the prior art, there is still no effective solution to the problem of real-time classification of surrounding rock in underground engineering

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