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CALCULATION RESULTS <br />OVERVIEW <br />CornerStone calculates stability assuming the wall is a rigid body. Forces and moments are calculated about <br />the base and the front toe of the wall. The base block width or bottom reinforcement length is used in the calculations. <br />The concrete units, granular fill over the blocks or reinforced zone soils are used as resisting forces. <br />EARTH PRESSURES <br />The method of analysis uses the Coulomb Earth Pressure equation (below) to calculate active earth <br />pressures. Wall friction is assumed to act at the back of the wall face. The component of earth pressure is assumed to <br />act perpendicular to the boundary surface. The effective delta angle is delta minus the wall batter at the back face <br />(assumed to be vertical). If the slope breaks within the failure zone, a trial wedge method of analysis is used. <br />INTERNAL EARTH PRESSURES <br />Effective internal Delta angle (2/3 phi) delta =21.3 deg <br />Coefficient of active earth pressure ka =0.244 <br />Internal failure plane p = 54.0 deg <br />EXTERNAL EARTH PRESSURES <br />Effective external Delta angle delta =32.00 deg <br />Coefficient of active earth pressure ka =0.244 <br />External failure plane p = 54.1 deg <br />co<j+ i)� <br />+ <br />a <br />a s' ¢tFi+c`� •sir $i— R7 <br />r_GS(1) •cGs1 — 1� 1 cos(5'— i)•C 6+ R) <br />Note: Calculations and quantities are for PRELIMINARY ANALYTICAL USE ONLY and MUST NOT be used for final <br />n or construction without the independent review, verification, and approval by a qualified professional engineer. <br />CornerStone Analysis and Design 5.0.19309 6 ��-- <br />