Cemented filling body damage evaluation method

Abstract

The invention relates to a cemented filling body damage evaluation method, which comprises the following steps of: filling body sample measurement stress-strain, acoustic emission ringing counting and accumulated ringing counting experimental data in a metal mine are obtained, stress-strain, time-ringing counting and time-accumulated ringing counting curves are drawn, the damage rate D and the damage rate D'of the filling body are defined according to the sound emission ringing count of the filling body, when the value of D 'is gradually increased from 0 to a stage 1, the stage is an internal fine crack rapid increasing stage, when D' = 1, the initial stage is an elastic-plastic stage, after D '= 1, D' is gradually reduced from 1 to 0, the value of D 'is reduced to be smaller than or equal to 0.6, and when D is larger than 0.8, it is indicated that the filling body is developed to the damage stage, and the interior of the filling body is seriously damaged. According to the method, the damage rate D'is defined through sound emission ringing counting to judge the damage speed in the filling body, the damage stage of the filling body is further judged, the damage speed in the filling body can be accurately and timely pre-judged to achieve safe production, and the method can also be used for filling body-surrounding rock early warning in actual engineering.

Description

technical field [0001] The invention belongs to the technical field of metal mines, and in particular relates to a damage evaluation method of a filling body-surrounding rock under stress. Background technique [0002] Mining filling technology is one of the main means of dealing with mine waste, so the mechanical properties of the filling body are particularly important; when the damage is found through strain and appearance during the stress damage process of the filling body, it is often in the late stage of damage, which has already occurred in actual engineering. destroy. In recent years, scholars at home and abroad have done a lot of research on the mechanical properties of filling bodies and the characteristics of acoustic emission signals through indoor and outdoor experiments, theoretical research, and field tests. Among them, acoustic emission signals can be directly measured on-site or tested indoors through equipment. Simple and fast, low cost, and less restrict...

AI Technical Summary

Problems solved by technology

[0003] The predecessors generally defined the damage rate by damage area, volume, etc. This method has great randomness and uncertainty, and the accuracy of measuring the internal damage area and volume of the specimen is low. Moreover, the degree of internal damage of the specimen is not It is completely determined by factors such as area and volume, and cannot describe the speed of internal damage of the filling body

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