Method for evaluating rockburst local damage deterioration based on nanoindentation experiment

Abstract

The invention discloses a method for evaluating rockburst local damage deterioration based on a nanoindentation experiment. The method comprises the following steps: acquiring a rock sample and first-grade rock debris; cutting and grinding the rock sample to take a rock core, and collecting secondary rock debris generated in the cutting and grinding process; carrying out three-direction six-surface loading on the processed rock sample, inflating the processed rock sample when a certain load is loaded, carrying out precise blasting to carry out a rock burst impact test, and selecting third-stage rock debris in the rock burst impact test; polishing the three kinds of rock debris, and obtaining a sample with high flatness; respectively acquiring point damage parameters, surface damage parameters and body damage parameters of the three kinds of rock debris; constructing a standard rock core model and performing uniaxial compression to obtain a fracturing effect, and performing simulation inversion for multiple times to obtain a rock brittleness index; respectively calculating debris damage degrees of the three rock debris through three-parameter damage evaluation; according to the method, the rock debris is subjected to micromechanical property analysis through the nano indentation and the nano scratch to obtain three-layer damage parameters, and rock damage evaluation and damage deterioration are accurately obtained.

Description

technical field [0001] The invention relates to the technical field of deep hard rock drilling engineering, in particular to a method for evaluating the local damage severity of rockburst based on nano-indentation experiments. Background technique [0002] Nanoindentation technology refers to applying a certain load on the surface of shale through an indenter of a certain shape to obtain the displacement and load curve, calculate the mechanical properties of shale through the obtained curve, and determine the microstructure of shale through the shape of the curve. Marking technology refers to the detection of lateral load, displacement and vertical load and displacement by moving the indenter on the surface of the sample for a certain distance, and then calculating the surface friction and microscopic properties of the sample to obtain the difference in properties of different bedding planes. [0003] In deep hard rock tunnels, the surrounding rock often produces rockburst d...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for evaluating the local damage degree of rockburst based on nano-indentation experiments, so as to solve the technical problem that the traditional macroscopic method in the prior art is no longer applicable to the three-level damage degradation evaluation

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