Rock damage time and damage energy prediction method

By conducting uniaxial compression test and acoustic emission measurement on rock samples, the precursor to the damage and the elastic strain energy density are determined, and the corresponding relationship is established, which solves the quantitative problems of rock damage time and energy prediction, and achieves accurate prediction and improvement of engineering safety guarantees.

CN119715128AActive Publication Date: 2025-03-28TONGJI UNIV
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Patent Information

Application Number
CN202411894509.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2025-03-28
Estimated Expiration
2044-12-20

AI Technical Summary

Technical Problem

Existing short-term predictions of rock damage are mainly qualitative analysis, and there is a lack of effective quantitative methods to predict the time of rock damage and the energy released during the damage process.

Method used

By conducting uniaxial compression tests on multiple rock samples of the same type, the acoustic emission system is used to measure the cumulative acoustic emission count during the damage process, determine the precursor of the damage, and calculate the elastic strain energy density, establish the correspondence between the rock damage time and the elastic strain energy density, and then predict the rock damage time and energy.

Benefits of technology

Accurate quantitative prediction of rock damage time and energy is achieved, and extended to prediction of surrounding rock damage in the project, improving project safety guarantees.

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Abstract

A rock damage time and damage energy prediction method comprises the following steps: performing a uniaxial compression test on a plurality of rock samples of the same type, and measuring an accumulated acoustic emission count in a damage process through an acoustic emission system; determining the damage precursor according to the rapid growth point of the accumulated acoustic emission count of each rock sample; determining the average proportion of the damage precursor points of all the rock samples in the whole damage time; calculating the elastic strain energy density of all the rock samples in the loading process; establishing a corresponding relation between the rock failure time and the elastic strain energy density; the method comprises the following steps: for to-be-tested rocks of the same type, acquiring damage precursor points, and predicting the rock damage time in advance according to the average proportion of the damage precursor points of all rock samples in the whole damage time; and calculating the rock breaking energy according to the corresponding relation between the breaking time and the elastic strain energy density and the rock volume. According to the method, through analysis of acoustic emission data, the rock breaking time and breaking energy can be accurately predicted in advance.
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