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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 is used in the calculations. The concrete units and <br /> granular fill over the blocks 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 6 angle is 6 minus the wall batter at the back face. If the <br /> slope breaks within the failure zone, a trial wedge method of analysis is used. <br /> EXTERNAL EARTH PRESSURES <br /> Effective 6 angle (2/3 retained phi) 6=26.7 deg <br /> Coefficient of active earth pressure ka=0.174 <br /> External failure plane p= 59 deg <br /> Effective Angle from horizontal a =94.80 deg <br /> Coefficient of passive earth pressure: kp= (1 + sin((p))1(1 -sin((p)) kp=4.60 <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 5.1.21009.30 5 <br />