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《Coal Science and Technology》 2014-12
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Study on Overburden Strata Movement Law in Coal Backfill Mining Face with Paste-Like Material

SHI Yong-kui;HAO Jian;SHANG Ya-ping;SUN Ting-ting;ZHAN Xiao-yuan;State Key Laboratory Breeding Base for Mining Disaster Prevention and Control,Shandong University of Science and Technology;School of Mining and Safety Engineering,Shandong University of Science and Technology;Caozhuang Mine,Feicheng Mining Group Co. ,Ltd.;  
In order to study the overburden strata movement law of a paste- like backfill coal mining face,a self- developed mine pressure sensor was applied to the mine strata pressure observation of No. 81006 paste- like backfill coal mining face in Caozhuang Mine. A distribution law of advance support pressure in No. 81006 coal mining face was obtained,including vertical stress within the backfilled mass and the roof and floor convergence value within the backfilled area. The results showed that an influence scope of the advance support pressure was about 10 m and a stress filed in front of the coal wall was in single elastic stress distribution. The max convergence value of the roof to floor within the backfilled area was about 104 mm and the compression ratio of the backfilled mass was 5. 2%. After the stress gauge in the backfilled mass was in a stable state,the stress was 15. 06 MPa and was close to the in- situ rock stress of 13. 75 MPa. A roof connection effect of the backfilled mass was good and the backfill mass could support full weight of the overburden strata. After coal mining face was backfilled,the mine strata pressure behavior was weak,the overburden strata was sable and expected effect was reached.
【Fund】: 国家重点基础研究发展规划(973计划)资助项目(2012CB723104);; 中国煤炭工业协会指导性计划资助项目(MTKJ2012-345)
【CateGory Index】: TD323
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