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TABLE 3 <br />Slope Stability Glide Block Analysis <br />Definition of Forces acting on Wedges <br />R., Active resisting force = W,w, - PA <br />ceL~ Cohesive resistance of coal seam x length of seam <br />Wws tandy4 Horizontal sheaz resistance of coal seam <br />W,w, Horizontal weight component of active wedge (A,y,) <br />W~„s Horizontal weight component of central wedge <br />(E AzYz, A3Ys, Aaya) <br />P,. Porewater pressure acting on central wedge = 1/2yHZ <br />(H = 45') <br />PA Active (driving) force = WA,tan(45 - ~Y2) - 2c,L,(cos(45 + ~'2)) <br />