4.5 Article

Study on the Fracture Law of Inclined Hard Roof and Surrounding Rock Control of Mining Roadway in Longwall Mining Face

Journal

ENERGIES
Volume 13, Issue 20, Pages -

Publisher

MDPI
DOI: 10.3390/en13205344

Keywords

thick and hard roof; working face width; model test; MS monitoring system; lateral abutment pressure; coal pillar stability

Categories

Funding

  1. National Natural Science Foundation of China part of Shaanxi Innovation Capability Support Program [51874231, 2020KJXX-006]
  2. Shaanxi Natural Science Fundamental Research Program Enterprise United Fund [2019JLZ-04]
  3. New star of science and technology in Shaanxi Province
  4. Special Support Program of Shaanxi Province in 2017 [2018TD-038]
  5. Shaanxi Innovation Team Program [2018TD-038]
  6. Outstanding Youth Science Fund of Xi'an University of Science and Technology [2019YQ2-16]

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In the inclination direction, the fracture law of a longwall face roof is very important for roadway control. Based on the W1123 working face mining of Kuangou coal mine, the roof structure, stress and energy characteristics of W1123 were studied by using mechanical analysis, model testing and engineering practice. The results show that when the width of W1123 is less than 162 m, the roof forms a rock beam structure in the inclined direction, the floor pressure is lower, the energy and frequency of microseismic (MS) events are at a low level, and the stability of the section coal pillar is better. When the width of W1123 increases to 172 m, the roof breaks along the inclined direction, forming a double-hinged structure, the floor pressure is increased, and the frequency and energy of MS events also increases. The roof gathers elastic energy release, and combined with the MS energy release speed it can be considered that the stability of the section coal pillar is better. As the width of W1123 increases to 184 m, the roof in the inclined direction breaks again, forming a multi-hinged stress arch structure, and the floor pressure increases again. MS high-energy events occur frequently, and are not conducive to the stability of the section coal pillar. Finally, through engineering practice we verified the stability of the section coal pillar when the width of W1123 was 172 m, which provides a basis for determining the width of the working face and section coal pillar under similar conditions.

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