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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 b angle is b 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 b angle (2/3 retained phi) b =24.0 deg <br /> Coefficient of active earth pressure ka =0.177 <br /> External failure plane p = 56 deg <br /> Effective Angle from horizontal 0 =99.00 deg <br /> Coefficient of passive earth pressure: kp = (1 + sin((p))/(1 - sin((p)) kp =3.85 <br /> _ slrn`t9 — R') <br /> rk!r` sine - j)i e N <br /> in which: <br /> = 1 + IS:►:(8 — }Sir(e t N� <br /> where : pe <br /> b =friction angle between fill and wall (degrees) <br /> R = angle of fill to the horizontal (degrees) - <br /> 0 = angle of bck face of wall to the horizontal (degrees) <br /> cp'f= effective angle of internal friction (degrees) <br /> h/3 <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 /> UltraWall 6.0.22298.930 7 <br />