Journal
ROCK MECHANICS AND ROCK ENGINEERING
Volume 49, Issue 5, Pages 1943-1952Publisher
SPRINGER WIEN
DOI: 10.1007/s00603-015-0868-x
Keywords
Rockburst; Extremely thick alluvium stratum; Mine design; Stress monitoring; Microseismic monitoring; Longwall mining
Funding
- National Natural Science Foundation of China [51174016, 51274022]
- National Basic Research Program of China (973 program) [2010CB226803]
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This paper investigates the abutment pressure distribution in coal mines with extremely thick alluvium stratum (ETAS), which is a typical kind of mines encountering frequent intense rockbursts in China. This occurs due to poor understanding to abutment pressure distribution pattern and the consequent inappropriate mine design. In this study, a theoretical computational model of abutment pressure for ETAS longwall panels is proposed based on the analysis of load transfer mechanisms of key stratum (KS) and ETAS. The model was applied to determine the abutment pressure distribution of LW2302S in Xinjulong Coal Mine; the results of stress and microseismic monitoring verified the rationality of this model. The calculated abutment pressure of LW2302S was also used in the terminal mining line design of LW2301N for rockburst prevention, successfully protecting the main roadway from the adverse influence of the abutment pressure.
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