Research on Support Technology of Narrow Coal Pillar Excavation Along Goaf in Medium-deep Isolated Island Working Face
There are some problems such as serious deformation of surrounding rock,difficult control and high cost in goaf excavation of isolated island working face.Taking 5103 return air chute of a mine as the research object,the optimum width of coal pillar for roadway protection is determined to be 6 m by various design methods.The efficient multi-layer support technology of shallow base layer,middle bearing layer and deep strengthening layer of roof surrounding rock is put forward,and the multi-layer bearing structure is formed mainly by long bolt+flexible bolt+long cable.The industrial test of 5103 return air channeling shows that the deformation of roadway surrounding rock has been effectively controlled,and good safety and economic benefits have been obtained,which can provide reference for mining of isolated island working face under similar conditions.
medium-thickisolated island working facenarrow coal pillar
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