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rV7�1 <br />U TR BLOCK, INC. <br />CALCULATION 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 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 i5 angle (2/3 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 />xa :_ co<j + i)2 <br />co4i)2•c05(3i— i)�1 + —(Si Si) cos + �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 />Factory <br />Force (V) <br />Force (H) <br />X-len <br />Y-len <br />Mo <br />Mr <br />Face Blocks(WI) <br />1.00 <br />2115 <br />- <br />1.23 <br />-- <br />`— <br />126001 <br />LvlPad(W18_) <br />1.00 <br />176 <br />-- <br />-- <br />--- <br />- <br />- <br />Pa ._h <br />—_ <br />1.00 <br />-- <br />380 <br />-- <br />1.67 <br />634 <br />--_ <br />--- <br />0 a- <br />1.00 <br />0 <br />-- <br />2.46 <br />-- <br />-- <br />0 <br />Pq_v <br />1.00 <br />0 <br />-- <br />2.46 <br />-- <br />-- <br />0 <br />Sum V / H <br />1.00 <br />2291 <br />502 <br />Sum Mom <br />938 <br />2600 <br />1 <br />b =22.7 deg <br />ka =0.254 <br />p = 58 deg <br />Eff. Angle =90.00 deg <br />kp =3.85 <br />UltraWall 4.0.16287.0 Page 7 <br />