Abstract
The dynamic disasters caused by the failure of hard roof in the process of mining coal seriously affect the safe production in coal mines. Based on the W1123 mining coal working face of Kuangou coal mine, the physical similar material simulation experiment and acoustic emission (AE) monitoring method are used to study the failure law and AE characteristics of overburden in the process of coal mining. The stress evolution law is revealed through numerical simulation, the dangerous areas and rock burst hazard under the repeated mining with hard roof are studied combined with microseismic monitoring on site. The results show that the energy of W1123 working face released by the overburden damage under B4-1 solid coal is higher than that of the gob, and the peak value of the AE energy appears near the W1145 open-off cut. Through the statistics of the AE data, the large energy rate of AE event is defined, and the AE events with large energy rate appear in the scale of 82.4–231.2 cm within the model. This area is shown as a stress superposition area according to the numerical simulation. On the basis of comparing with the characteristics of energy distribution in the field, it is considered that the main control factors of rock burst in this area are hard roof of the working face and the stress concentration caused by the repeated mining. It provides a scientific guidance for the prevention and control measures of rock burst in this type of mining condition.
Highlights
Dynamic disaster induced by hard roof is one of the serious disasters in the coal mine
Simulation of Overburden Breakage Based on acoustic emission (AE) Monitoring
W1123 working face is large during the mining process under B4-1 solid coal, the AE energy rate is
Summary
Dynamic disaster induced by hard roof is one of the serious disasters in the coal mine. The study from three aspects of geological structure, microseismic activity and stress field shows that the cutting action of reverse fault is easy to cause large area movement of thick and hard top plate, which provides dynamic load conditions for the occurrence of rock burst in working face [11]. Based on the study of energy source and disaster mechanism of rock burst in hard direct roof working face by using microseismic and mine pressure monitoring, it is shown that the dynamic load caused by periodic breaking of hard direct roof increases the f rock burst hazard in working face [13].
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