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• <br />Step 4 <br />Determine the ratio between the critical height (Hc2) of the soil arch within <br />the waste and the diameter (2) of the unsupported foundation at the base of <br />the waste layer. <br />Ulm <br />$C2 (From Figure 2) <br />2 <br />Step 5 <br />. Determine the half apex angle (®2) of the cone of soil within the waste layer. <br />= (H /B) <br />c2 2 c2 2 <br />82 = Tan -I (r2 <br />1(r2 / c2 ) <br />. Determine the pressure (PN) over the yielding area at the base of the soil layer. <br />- r1 (r,-HI7-an81) +y lr1 " H1Tan83 <br />1)PN 1/3 y3(21Tan®-r,21'an81 r Tang <br />12 2 <br />(7) <br />