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U T BLOCK, 1 C. <br />BASE SLIDING <br />Sliding at the base is checked at the block to leveling pad interface between the base block and the leveling <br />pad. Sliding is also checked between the leveling pad and the foundation soils. <br />Forces Resisting sliding = W1 + W2 <br />2115+0 N=2115ppf <br />Resisting force at pad = N tan(slope) + intercept x L <br />2115 x tan(33.9) + 0.0 x 2.5 Rf1 =1420 <br />where L is the base block width <br />Friction angle is the lesser of the leveling pad and Fnd cp =36.00 deg <br />N1 includes N (the leveling pad) + leveling pad (LP) <br />2115 + 176 N1 = 2291 ppf <br />Passive resistance is calculated using kp = (1 + sin(36))/(1 - sin(36)) kp = 3.85 <br />Pressure at top of resisting trapezoid, d1 = 1.00 Fp1 = 500.74 <br />Pressure at base of resisting trapezoid, d2 = 1.50 Fp2 = 751.11 <br />Depth of trapezoid depth = 0.50 <br />Pp = (Fp1 + Fp2) / 2 * depth 312.96 <br />Resisting force at fnd = (N1 tan(phi) + c L) + Pp <br />2291 x tan(36) + 0 x 2.7 + 313 Rf2 = 1978 <br />where LP = Ivl pad thickness * 130pcf * (L + Ivl pad thickness/2) <br />Driving force is the horizontal component of Pah + Pqh <br />Df =502 <br />FSsl = Rf / Df FSsl =2.83 / 3.94 <br />UltraWall 4.0.16287.0 Page 8 <br />