Mine strata behavior law and support strength of different working face length
In order to study the influence of different working face lengths on the mine strata behavior law and the change law of the reasonable support strength of the support when the working face length changes,combined with the actual geolog-ical conditions of a mine,the mine strata behavior under different working face lengths is analyzed and calculated.The anal-ysis shows:when the length of the working face is fixed and the excavation distance along the strike direction exceeds 450 m,the rib spalling and roof subsidence is in a stable state and is no longer affected by the excavation distance along the strike direction;Based on the one-time excavation of 450 m,along the working face direction,the roof subsidence is the lar-gest in the middle and the smallest at both ends in an arch shape.With the increase of the working face length,the roof sub-sidence arch gradually increases.With the every 30 m increase of the working face,the increasing rate of the roof subsidence is 5％～8％.The roof subsidence can directly reflect the roof pressure.According to the analysis and calculation,the rea-sonable support strength will increase by 5％～8％with the every 30 m increase of the working face.
working face lengthmine strata behaviorcoal wall spallingroof subsidencesupport strength
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