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Experimental Study on the Effect of Advancing Speed and Stoping Time on the Energy Release of Overburden in an Upward Mining Coal Working Face with a Hard Roof

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  • Feng Cui

    (Energy School, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education, Xi’an 710054, China
    Key Laboratory of Coal Resources Exploration and Comprehensive Utilization of Ministry of Land and Resources, Xi’an 710021, China)

  • Yanbin Yang

    (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
    Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education, Xi’an 710054, China)

  • Chong Jia

    (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
    Key Laboratory of Western Mines and Hazard Prevention of China Ministry of Education, Xi’an 710054, China)

Abstract

In order to study the influence of advancing speed and stoping time of a coal face on the scale and frequency of rock burst, the energy release characteristics of an overburden fracture under six advancing speeds and four stoping times are studied by theoretical analysis and similar simulation experiments. The distribution characteristics of microseismic events before and after stoppage are compared, and the load/unload response ratio is introduced to analyze the relationship between the synergistic effect of advancing speed and stoping time and the characteristics of microseismic events in coal and rock mass. The mechanism of rock burst induced by the advancing speed and stoping time effect in the working face is studied, and the coordinated regulation and mitigation of advancing speed and stoping time are analyzed and completed. The results show that the effect of advancement speed and stoping time is very important to the energy release of overburden. The energy released by microseismic events during stoping is exponentially related to the advancing speed. The change of advancing speed causes the change of microseismic event characteristics, reflecting the evolution process of overburden structure and its energy. During stoping, the secondary microseismic events disturbed by mining occur frequently, leading to the significant difference of energy released by microseismic events during stoping. After stoping, the microseismic energy is more than four times higher than that during the stop period, and the risk of coal seam impact is high during the stope period. The synergetic change of advancement speed and stoping time changes the cycle of energy accumulation and release. The response ratio of loading and unloading considering the effect of advancement speed and stoping time is established by using the corresponding ratio of loading and unloading, and the impact risk of the coal seam is quantitatively analyzed. Based on the monitoring and analysis of microseismic events, the safety mining index of coordinated control with the energy of a single microseismic event of 180 J is established, and the best advancing speed of the working face is determined to be 4 m/d. According to the corresponding ratio of loading and unloading, the reasonable stoping time of different advancing speeds and the corresponding advancing speed of different stoping times after the resumption of mining are determined, so as to provide a reference for the safe and efficient mining of similar rock burst mines.

Suggested Citation

  • Feng Cui & Yanbin Yang & Xingping Lai & Chong Jia & Pengfei Shan, 2019. "Experimental Study on the Effect of Advancing Speed and Stoping Time on the Energy Release of Overburden in an Upward Mining Coal Working Face with a Hard Roof," Sustainability, MDPI, vol. 12(1), pages 1-23, December.
    • Handle: RePEc:gam:jsusta:v:12:y:2019:i:1:p:37-:d:299577
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    References listed on IDEAS

    as
    1. Feng Cui & Tinghui Zhang & Xingping Lai & Jiantao Cao & Pengfei Shan, 2019. "Study on the Evolution Law of Overburden Breaking Angle under Repeated Mining and the Application of Roof Pressure Relief," Energies, MDPI, vol. 12(23), pages 1-20, November.
    2. Dawid Szurgacz & Jarosław Brodny, 2019. "Analysis of the Influence of Dynamic Load on the Work Parameters of a Powered Roof Support’s Hydraulic Leg," Sustainability, MDPI, vol. 11(9), pages 1-13, May.
    3. Dawid Szurgacz & Jarosław Brodny, 2019. "Tests of Geometry of the Powered Roof Support Section," Energies, MDPI, vol. 12(20), pages 1-19, October.
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    Cited by:

    1. Zhaowen Du & Shaojie Chen & Junbiao Ma & Zhongping Guo & Dawei Yin, 2020. "Gob-Side Entry Retaining Involving Bag Filling Material for Support Wall Construction," Sustainability, MDPI, vol. 12(16), pages 1-20, August.
    2. Feng Cui & Shuai Dong & Xingping Lai & Jianqiang Chen & Chong Jia & Tinghui Zhang, 2020. "Study on the Fracture Law of Inclined Hard Roof and Surrounding Rock Control of Mining Roadway in Longwall Mining Face," Energies, MDPI, vol. 13(20), pages 1-22, October.

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