Face End Support and Advance Support Technology in High Inclined Seam

According to the seam deposit condition complicated,high variation of the roof dip angle, the roof maintenance difficulty of the advance support sections i . n the up and low ends of the coal mining face and the two gateways,the roof support technical measures of the up and low ends of the coal mining face were studied an d determined.The advance support technical plan for the roof tip angle less than 5°,515° and over 15° of the mining gateway were provided.The site practices showed t hat when the mining gateway roof angel higher than 15° ,after the floor dinting and roof advance support measures applied,the roof subsidence speed would be obviousl y reduced and the maximum subsidence value of the roof at the advance support section of the transportation gateway was 170 mm.The maximum subsidence value of the roof at the advance support section of the air retuning gateway was 230 mm,could meet the layer requirements of the gateway mining and ensure the stability of the roof at the advance support section of the mining gateway.