Testing system and testing method for mechanical property of coal rock test piece

Abstract

The invention discloses a testing system and a testing method for mechanical property of a coal rock test piece. The testing system comprises traditional mechanical property testing, a medical image and rock breaking intelligent monitoring; the traditional mechanical property testing comprises a mechanical index testing system and a hydraulic control continuous loading system; the medical image comprises an X-optical mechanical scanning system and an enhancing image system; the rock breaking intelligent monitoring comprises a sound emitting monitoring system and a thermal infrared monitoring system. The testing method for the mechanical property of the coal rock test piece particularly comprises the following steps that 1 a mechanical test platform and DR / CR image equipment are started; 2 the coal rock test piece is placed on the carrying disc position of a mechanical test machine, and an AE sensor and the test piece are fixed; 3 a contrast agent is injected; 4 one-time DR / CR image scanning is conducted; 5 a mechanical property test is carried out on the coal rock test piece. The obtained image is clear in picture, the analysis carried out on the microscopic scale such as internal microcracks of the rock sample test piece is achieved, and the experimental data are more accurate.

Description

technical field [0001] The invention relates to a mechanical property testing system and a testing method thereof, in particular to a coal rock specimen mechanical property testing system and a testing method thereof. Background technique [0002] The test of mechanical properties of rock samples is the most basic method to study the stability of mine rock mass. The yield failure of mine rock mass is a dynamic process under the joint action of in-situ stress and mining stress. Under laboratory conditions, the parameters of the mechanical property test of the collected rock samples are measured and the dynamic evolution characteristics of cracks under compression are obtained. It has important guiding significance for the prediction and prediction of mine rock mass stability. [0003] The traditional testing of mechanical properties of material specimens is only to determine the basic mechanical parameters (such as compressive strength, shear strength, etc.) Such as acousti...

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Problems solved by technology

[0004] Existing tests of mechanical properties of coal and rock samples are only for the acquisition of simple "stress-strain", "stress-temperature", "stress-damage" and "stress-AE-strain" coupling relationships and indicators, and displacement is carried out based on these parameters Back analysis and fractal theory realize the stability prediction of coal and rock mass. These methods often have large calculation errors, large amount of data and relatively cumbersome calculation process; relying on single or multiple index parameters cannot realize the scientific solution to rock mass engineering stability problems , accurate experimental data, intuitive image analysis and scientific theoretical calculations have become important methods and approaches to realize the prediction and prediction of the stability of coal and rock mass; the existing research on the mesoscopic damage characteristics of coal and rock mass only uses CT scanning technology and supporting An independent loading platform for mechanical specimens, and then realize the analysis on microscopic scales such as micro-cracks inside rock specimens

Due to the limited ability of CT scanning equipment to identify microcracks and the lack of corresponding contrast enhancement functions, it is difficult to obtain clearer images

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