Method for testing rock microcracks

Abstract

The invention relates to a rock microcrack testing method for testing the deep engineering rock microstructure, including electrolytic solution preparing, rock sample mounting, rock alternating current impedance spectrum data acquisition and data fitting analysis; coating conducting adhesive on the sample for connecting wires, horizontally mounting the sample between containers, and infusing the electrolytic solution in the containers; enveloping mineral butter or ceresin wax on the sample, connecting the wires to the electrochemistry workstation, testing the natural potential of the rock sample tester, zeroing using the electrochemistry workstation; adopting a 5mV disturbance voltage to test the electrochemistry impedance spectrum of the sample, whose frequency range is from 1*10<6>Hz to 0.1Hz; selecting a high-frequency arc frequency range, ciphering the test data points, using the 5mV disturbance voltage to test the sample high-frequency arc electric impedance spectrum, and using the full-frequency band electric impedance spectrum to qualitatively distinguish the size variation of the rock microcracks; according to the high-frequency arc measured data, using ZPLOT to simulate the electrology element numerical values on the high-frequency arc equivalent circuit, calculating the microcrack sizes inside the sample, thereby having the advantages of high accuracy, easy test and convenient operation.

Description

technical field [0001] The invention relates to a method for detecting rock micro-cracks for detecting the micro-structure of deep engineering rocks. Background technique [0002] Due to the complex stress level and high stress level in the deep part, the hidden cracks in the deep rock are more likely to affect the mechanical behavior of the rock than in the shallow rock. If the failure of shallow rock mass is generally gradual, and when it is close to failure, it often shows the phenomenon of intensified deformation and obvious precursors of failure, then under deep conditions, rock mass failure has a strong impact failure property, and its dynamic response The destruction process is often a sudden and sudden mutation process without warning. This process is manifested in the sudden collapse and instability of a wide range of roadways in the roadway, and in the working face as the sudden large-area impact of the roof, resulting in very serious engineering disasters. This ...

AI Technical Summary

Problems solved by technology

[0008] At present, the use of electrochemical methods to test the surface or interface of materials generally uses a three-electrode device, that is, a working electrode, a reference electrode, and an auxiliary electrode. The surface state is analyzed by measuring the electrochemical impedance spectrum of the working electrode, such as studying corrosion When solid corrosion is formed on the surface of the metal electrode, if the interface capacitance is small, it is considered that a dense passivation film is formed on the metal surface, which is a good result for anti-corrosion materials; if the interface capacitance is large, it is considered that a loose film is formed on the metal surface. Porous aqueous solid corrosion product, poorer result for corrosion resistant materials

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