The Experimental Research On The Relationship Between Charge Induction In Coal Failure And Burst Potential

With the coal mining depth increasing, the rockburst disasters are becoming more and more serious.And the coal burst potential is the internal factor affecting the rockburst.With the application of charge induction monitoring technology, the stress state of coal can be mastered directly, and the rockburst disasters can be monitored and forecasted more timely and accurately. All these can achieve the purpose of effective prevention and control.The method of numerical simulation and laboratory experiments combination is used in the paper.The coal failure mechanism reflected by the various indicators of burst potential is analyzed theoretically. The relationship between charge induction in coal failure and the various indicators of burst potential is studied through the laboratory experiments.Also through the laboratory experiments, the relationship between charge induction in coal failure and burst potential under different moisture contents is studied.The main work and innovation points are as follows:The compressive strength and the coal failure mechanism reflected by it are analyzed.The relationship between charge induction in coal failure and compressive strength is studied through the experiments. The results showed that:the longer the compressive strength, the shorter the charge decay time and the less the cumulative charge, but the more charge per unit time.The dynamic failure time and the coal failure mechanism reflected by it are analyzed.The relationship between charge induction in coal failure and dynamic failure time is studied through the experiments. The results showed that:the longer the dynamic failure time, the longer the charge decay time and the more the cumulative charge, but the less charge per unit time.The impact energy index and the coal failure mechanism reflected by it are analyzed.The relationship between charge induction in coal failure and impact energy index is studied through the experiments. The results showed that:the longer the impact energy index, the shorter the charge decay time and the less the cumulative charge, but the more charge per unit time.The elastic energy index and the coal failure mechanism reflected by it are analyzed.The relationship between charge induction in coal failure and elastic energy index is studied through the experiments. The results showed that:the longer the elastic energy index, the shorter the charge decay time, but the more the cumulative charge and the more charge per unit time.The relationship between charge induction in coal failure and burst potential under different moisture contents is studied through the laboratory experiments. The results showed that:with the moisture content increasing, the various indicators of burst potential decrease (except for the dynamic failure time), and both of the charge decay time and accumulated charge amount increase first and then decrease.The study of the relationship between charge induction in coal failure and burst potential can provide experimental datas and references for field research, and has an important theoretical and practical significance.