Journal
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
Volume 25, Issue 3, Pages 429-434Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijmst.2015.03.016
Keywords
Deep coal roadway; Truss system; Inverted arch deflection; Equivalent uniform load; Powerful anchor support
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Funding
- National Natural Science Foundation of China [51234005]
- National Basic Research Program of China [2010CB226802]
- Fundamental Research Funds for the Central Universities [2010QZ06]
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Aiming at the surrounding rock control problem of mining and preparation entries in Xingdong mine with large mining depth, and the comprehensive control countermeasures including high pre-stress cable truss system, this study put forward powerful anchor support system and anchor cable adaption technology to surrounding rock deformation. Furthermore, the control measures possess the supporting performance with primary rigid-following flexible-new rigid, and primary resistance-following yield-new resistance'', which suits deep roadway surrounding rock control. The mechanical model of truss anchor supporting roof beams was established, and the inverted arch deflection produced by the cable pre-stress with stress increment effect and roof beam deflection were obtained. And then the system working mechanism was illustrated. Finally, the surrounding rock support parameters were determined by means of comprehensive methods, and put into practice. The results show that surrounding rock deformation realized secondary stability after three months. The roadway sides convergence value was less than 245 mm, and roof subsidence was less than 124 mm. In addition, there was no expansion and renovation during service period. (C) 2015 Published by Elsevier B.V. on behalf of China University of Mining & Technology.
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