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Step 4 <br /> • Determine the ratio between the critical height(Hc2) of the soil arch within <br /> the waste and the diameter (B2) of the unsupported foundation at the base of <br /> the waste layer. <br /> B2 =2r2 <br /> $c2 (From Figure 2) <br /> 2 <br /> Step 5 <br /> . Determine the half apex angle l®2) of the cone of soil within the waste layer. <br /> H B= /B <br /> c2 2H( c2 2) <br /> 82 = Tan-1(r2 I Hct) <br /> Step 6 <br /> • Determine the pressure(PN)over the yielding area at the base of the soil layer. <br /> 3 <br /> rl (r, —H,1an®1) +y2 l(rj _H,TPN i13 an81�3 <br /> = —I Tan® r27y1 r2 Tan8 <br /> 12 <br /> (7) <br />