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S[°NITERRA' <br /> IWALL 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 /> co1$,i+i'I" <br /> d _ 2 <br /> • <br /> cos(i)a•cos(5i—i) l+ sc s(6i--oi).cos(ii+{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 5.0.19183 8 <br />