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Step l <br /> • Determine the ratio between the critical height ( HCI } of the soil arch and the <br /> diameter(B' )of the depression for the soil layer. <br /> B, =2r, <br /> HCI (from Rgure 2) <br /> BI <br /> Step 2 <br /> • Determine the half apex angle ®I of the cone of soil within the soil layer_ <br /> HCI'BI(HcI IBI) <br /> el =7an-I(rl / Cl) <br /> Step 3 <br /> • Determine the radius (r2) at the base of the waste layer that remains unsupported <br /> by the arch within the soil layer. <br /> rI _ r2 <br /> H cl HCl -H I <br /> r2 - rl(H I --HI) <br /> HCI <br /> (G) <br />