Large Span Open-off Cut Support Technology of 3501 Working Face in Changcheng Coal Mine
Aiming at the stability of surrounding rock of large-span open-off cut in working face,through the analysis of roadway characteristics and original technical scheme,the support scheme of full an-chor cable for roof is proposed.The anchor cable layout parameters are calculated by relevant theories,and the parameters are optimized according to the mine technical equipment.The length of the anchor cable is 8.0 m,the diameter is 22 mm,and the row spacing is 1 m.FLAC3D was used to simulate the distribution of stress,displacement and plastic zone of surrounding rock under two support schemes of roof full anchor ca-ble and bolt+anchor cable.Through comparison,it can be seen that the maximum vertical stress,maximum stress concentration factor and maximum vertical displacement of the roof full anchor cable support are re-duced by 10.8 MPa,0.74 and 43 mm respectively compared with the bolt+anchor cable support scheme,and the range of tensile yield is obviously reduced.The field practice and test show that the application of this support scheme can ensure the stability of the open-off cut,which has reference value for the same type of mine.
large span open-off cutcoal roadway supportinganchor cabledisplacement of sur-rounding rock
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