Study on Rule of Overburden Failure and Rock Burst Hazard under Repeated Mining in Fully Mechanized Top-Coal Caving Face with Hard Roof

Feng Cui, Shuai Dong, Xingping Lai, Jianqiang Chen, Jiantao Cao and Pengfei Shan
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Feng Cui: Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
Shuai Dong: Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
Xingping Lai: Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
Jianqiang Chen: Shenhua Xinjiang Energy Ltd., China Energy, Wulumuqi 830027, China
Jiantao Cao: Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
Pengfei Shan: Energy School, Xi’an University of Science and Technology, Xi’an 710054, China

Energies, 2019, vol. 12, issue 24, 1-16

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.

Keywords: AE monitoring; rock burst; hard roof; repeat mining (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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