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Abstract Gob-side entry retaining by filling has two shortcomings in high stress or encountering overlying strata violent movement，i.e. rigid material filling easily lead to packing wall stress concentration，even fractured or failure，caused fire or CO，CH4 leakage，and flexible material filling easily lead to roof cave-sink too large and even the occurrence of roof fall. In order to solve the problems，filling method was improved in Huaheng coal mine. Based on the study on the overburden stratum movement process and structure morphological characteristics above gob-side entry retaining，we calculated the amount of compression of the filling body，and two strength grades of roadway supports of gob-side entry retaining were design：the upper filler is high expansion to firmly seal the gap，and adapting impact load of the main roof movement；the lower filler strength support specific roof. Based on mechanical model established，the lower filler strength is calculated；Based on structure model established，the lower filler strength is calculated. Mineral pressure observation showed that the design of gob-side entry retaining met the application requirements.
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Received: 06 December 2011
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2012, Vol. 31 
