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STO <ITERR'I WALL SYSTEM <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 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=22.7 deg <br /> Coefficient of active earth pressure ka=0.238 <br /> Internal failure plane p= 57.0 deg <br /> EXTERNAL EARTH PRESSURES <br /> Effective external Delta angle delta=30.00 deg <br /> Coefficient of active earth pressure ka=0.296 <br /> External failure plane p=56.0 deg <br /> cosC4 j+i) <br /> a <br /> Ka:— <br /> 2 <br /> cosO.) •cos(Si-i L1't $cos(Si— cas +p) <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 5.0.19183 8 <br />