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0 • <br /> CALCULATION RESULTS <br /> OVERVIEW <br /> UltraWall calculates stability assuming the wall is a rigid body. Forces and moments are calculated about the <br /> base and the front toe of the wall. The base block width is used in the calculations. The concrete units and granular fill <br /> 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(3/4 retained phi) b =25.5 deg <br /> Coefficient of active earth pressure ka=0.502 <br /> External failure plane p=44 deg <br /> Effective Angle from horizontal Eff.Angle =81.68 deg <br /> Coefficient of passive earth pressure: kp= (1 +sin(cp))/(1 -sin(cp)) kp=3.54 <br /> 2 <br /> c0s(4)i+i) <br /> z :— a <br /> s' iri+ s• 4- <br /> cas i '•cas( —i 1 + cos(Si— )•caski+ 13) <br /> UltraWall 5.0.18138 ,— <br /> a P ge /5 S <br />