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U TR BLOCK, INC. <br />177CALCULATION RESULTS <br />OVERVIEW <br />UltraWall 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 (3/4 retained phi) <br />Coefficient of active earth pressure <br />External failure plane <br />Effective Angle from horizontal <br />Coefficient of passive earth pressure: kp = (1 + sin((p)) / (1 - sin((p)) <br />co(j + i)2 <br />xs :_ <br />a <br />cos(i)2-COS (6i— i)�1 + cos(S- — i)—' i+ R <br />W0: stone within units <br />W1: facing units <br />W2: stone over the tails <br />W9: Driving force Pa <br />W10: Driving Surcharge load Paq <br />W11: Driving Dead Load Surchage Paqd <br />FORCES AND MOMENTS <br />The program resolves all the geometry into simple geometric shapes <br />coordinates are referenced to a zero point at the front toe of the base bloc <br />UNFACTORED LOADS <br />Name <br />Factor y <br />Force (V) <br />Force (H) <br />X-len <br />Y-len <br />Mo <br />Mr <br />Face Blocks(W1) <br />Soil Wedge(VV2) <br />1.00 <br />3807 <br />-- <br />1.78 <br />-- <br />-- <br />6760 <br />1.00 <br />500 <br />- <br />3.01 <br />-- <br />-- <br />1504 <br />Lv1Pad(W18) <br />1.00 <br />336 <br />- <br />-- <br />-- <br />-- <br />-- <br />Pa—h <br />1.00 <br />-- <br />1110 <br />-- <br />2.50 <br />2775 <br />-- <br />Pa v <br />1.00 <br />1059 <br />-- <br />4.10 <br />-- <br />-- <br />4338 <br />Pq_v <br />1.00 <br />274 <br />-- <br />13.691 <br />1 1010 <br />Sum V H <br />1.00 <br />5976 <br />1397 1 <br />1 Sum Mom <br />138521136121 <br />6 =25.5 deg <br />ka =0.420 <br />p=64deg <br />Eff. Angle =71.85 deg <br />kp =3.85 <br />UltraWall 4.0.16287.0 Page 7 <br />