A Method for Evaluating the Inferiority of Rockburst Local Damage Based on Nanoindentation Experiment

Abstract

The invention discloses a method for evaluating the local damage inferiority of a rockburst based on a nano-indentation experiment, obtaining rock samples and first-level cuttings; cutting and grinding the rock samples to obtain rock cores, and collecting the second-level cuttings produced during the cutting and grinding process ; The processed rock sample is loaded in three directions and six sides, and the loaded load is fixed to inflate the processed rock sample with precise blasting for impact rock burst test, and the third-level cuttings in the impact rock burst test are selected; The cuttings are polished to obtain samples with high flatness; the point damage parameters, surface damage parameters and volume damage parameters of the three kinds of cuttings are obtained respectively; a standard core model will be constructed and uniaxially compressed to obtain the fracturing effect. The rock brittleness index is obtained by simulation inversion; the damage degree of the three kinds of cuttings is calculated respectively through the three-parameter damage evaluation; the present invention obtains the three-layer damage parameters by analyzing the microscopic mechanical properties of the cuttings through nano-indentation and nano-scratching, and accurately obtains Rock damage evaluation and damage severity.

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...

AI Technical Summary

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

Images