Research on Structural Characteristics of Dynamic Nuclear Zone in Dynamic System of Coal and Rock

Abstract

"Inordertocalculatetheconcretescalerangeofcoalandrockmassinrockburstofdifferentdegreesofdangerandtopreventand control rockburst in coal mines, the concept of dynamic system of coal and rock is put forward in this paper. The model of the relationshipbetweentheoccurrenceofrockburstanddynamicsystemisbuiltatthesametime,whichcouldbeusedtoanalyzethe rockburstriskofcoalandrockindifferentscales.Thecalculationmethodofdynamicnuclearzonescaleanditsevaluationsystem and quantitative indicators are put forward based on the energy release process of dynamic system of coal and rock. Combined with the fracturing technology of liquid CO2, the accuracy of the calculation method for the radius of dynamic nuclear zone is verified in a coal mine in Shanxi Province. The degree of coincidence between the results of the two methods is 96.9%∼97.5%, which shows that the calculation method for the radius of dynamic nuclear zone has high reliability and practicability. This methodcanbewidelyusedinforecastingtheriskofrockburst.TheliquidCO2 fracturingmethodcanbewellusedtosimulatethe blasting source of rockburst at the same time and can be applied to more mines in the future. "