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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 bast of <br /> the waste layer. <br /> B2=2r2 <br /> c2 (From Figure 2) <br /> $ <br /> 2 <br /> Step 5 <br /> • <br /> Determine the half apex angle ( 2) of the cone of soil within the waste layer. <br /> c2 ® 2( c2/ Z) <br /> 02 = Tan <br /> _i(r2 1H c2) <br /> Step 6 <br /> • Determine the pressure(PN) over the yielding area at the base of the soil layer. <br /> PN = 1/3 y rl (r, —H.�T an8i)3 +y (r, 1-H,TanBl)3 <br /> 1 Tan81 r�21'anB� 2 r 2 Tang <br /> t 2 ' <br /> (7) <br /> ! <br />