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中南大学学报(英文版)

Journal of Central South University

Vol. 24    No. 8    August 2017

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Measurement and numerical analysis of influence of key stratum breakage on mine pressure in top-coal caving face with super great mining height
LI Meng(李猛), ZHANG Ji-xiong(张吉雄), HUANG Yan-li(黄艳利), GAO Rui(高瑞)

School of Mines, Key Laboratory of Deep Coal Resource Mining of Ministry of Education of China,
China University of Mining & Technology, Xuzhou 221116, China

Abstract:To analyze the influence of movement in shallow-buried working faces with large mining heights on mine pressure manifestation, the key stratum at a working face was categorised using the 1313 top-coal caving face with super great mining height under cover as a case study. The research combined theoretical analysis, field measurement, and numerical simulation to analyze the influencing mechanism of key stratum. Moreover, the research results were verified by numerical simulation and indicate that the sub-key stratum is prone to be broken to form a “cantilever beam” structure rather than a stable hinged structure during the excavation of working faces with super great mining heights. When the “cantilever beam” structure is unstable, a low pressure will occur on the working face, and the overlying strata will subside simultaneously with the sub-key stratum to induce the breakage of the primary key stratum: the breakage will further trigger the periodic breakage of sub-key stratum, causing a greater load on the working face. Finally, steps, and strength of weighting in the working face vary to be great or small alternatively. This is the main reason explaining why the 1313 working face shows strong mine pressure manifestation. The results provide theoretical and practical experience for forecasting and controlling mine pressure manifestation.

 

Key words: super great mining height; key stratum; cantilever beam; mine pressure manifestation; under cover

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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