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《Coal Science and Technology》 2014-01
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Study on Ground Subsidence Law for Paste Backfill Fully Mechanized Coal Mining Face

BAI Guo-liang;Tangshan Research Institute Co. Ltd. ,China Coal Technology & Engineering Group;  
In order to predict ground subsidence for paste backfill fully mechanized mining accurately and protect the surface buildings effectively,the ground subsidence law and prediction parameters for paste backfill fully- mechanized coal mining face had been studied deeply through the comprehensive application of the theoretical studies,inside test,field observation and numerical simulation. The results showed that the backfill body strength from 1 ~ 3 days early increased quickly,the backfill body strength tended to be stable after seven days,the ultimate strength of backfill body was slightly below coal body; the phenomenon of ground appeared at the boundary of mining influence,the tangent value of main impact angle was much smaller,and the scale of its influence was larger; the ground subsidence prediction parameters for paste backfill mining in Daming Mine had been got,based on the probability integral method,subsidence factor for paste backfill was 0. 19 ~ 0. 22 times that for fall down coal mining. To improve prediction accuracy,the model need to be modified when predicted ground subsidence of paste filling with probability integral method.
【Fund】: “十二五”国家科技支撑计划重点资助项目(2012BAC13B03)
【CateGory Index】: TD327
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