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5FA Design Group, LLC <br />STRUCTURAL I GEOTECHNICAL I SPECIAL INSPECTIONS <br />Gridline C <br />NO. ISHEETNO. <br />Concrete' Backfill Dimensions <br />Effective Friction Angle = <br />26 <br />Passive Coefficient, KP = <br />tan A2*(45+0'/2) <br />sIElnvut <br />Kp = <br />2.57 <br />Passive Pressure, Pp = <br />2.57 * 100 = 257 pcf <br />g <br />nNig, OWE <br />Cohesion, c- <br />1500 psf----- <br />--�. <br />I <br />Soil Unit Weight, y = <br />100 cfx <br />P <br />II <br />Depth of Backfill, d = <br />2.0 ft <br />III-IIEIIEIII-11 III—IIII�III- <br />_ <br />_ <br />Width of Backfill, w = <br />1.5 It g <br />—II�III-III <br />i' <br />co,r,c <br />Depth to Backfill, r = <br />2.0 ft =- <br />J=11� <br />'••",r'� ;; <br />I- II�III— <br />_ _ <br />Soil Neglected = <br />1.0 ft <br />Backfill Depth Below Grade = <br />4.0 ft <br />Passive Lateral Resistance Actng�on <br />Con <br />Passve P eissure at Base, ap^ Pp (d+r) <br />256.8pcf * (4 ft) = vp' = 1027 psf <br />Lateral Capacity/Pier, Rp = ((A+B)/2)*d <br />Rp=((A+B)/2)*d=((770 plf+1541 plf)/2)*2 ft = 2311 lbs <br />1ftNEGLECTED <br />Depth to Backfill - 1 ft = 1 ft <br />Depth of Backfill d = 2 ft <br />LOADING DIAGRAM PER PIER <br />k _ (Kp*y*r)*w = 770 plf <br />Rp = 2311 lbs <br />I = (Kp*y*(r+d))*w = 1541 plf <br />sf <br />Lteral- Resisance.. p_ er-Pier <br />------•------------ ._�._.___._� <br />Concrete Backfill Spacing = 0.0 ft (OB) <br />P-Multiplier 1st Backfill = 1.00 OW <br />perAASHTO TABLE BELOW <br />P-Multiplier 2nd Backfill = N/A (INTERPOLATION EL <br />P-Multiplier Other Backfills = N/A <br />Number of Piers to Be Backfilled = 1 pier(s) <br />Lateral Resistance of 1st Backfill = 1 * 2311 lbs = 2311 lbs <br />Lateral Resistance of 2nd Backfill = N/A <br />Lateral Resistance of Other Backfills = N/A <br />Table 1W.M.1—Pile P•Mullip0ers. P,„, for Multiple Row Shading (averaged from Hannigan et al., 2006) <br />Pile CTCspachtg (In die direction of P-Muldplfers, & <br />loadin) Row 1 Row 2 Row 3 and higher <br />3l3 0.8 0.9 0.3 <br />5B 1.0 U.85 0.7 <br />(Total Lateral-Resisfance-of Piecing System: ---- <br />Lateral Resistance = 1 st Backfill + 2nd Backfill + Other Backfills + Slab + Unpiered + Passive Pressure on Footing + Pier Passive + Tiebacks <br />Total Lateral Resistance = 2311lbs + Olbs + Olbs + 0 lbs + 4150 lbs + 198 lbs + 0 Ibs + 0 lbs; = 6669 Ibs <br />Factor of Safety = 1.1 <br />Allowable Resistance = 6053 lbs >4649 lbs OK <br />Polyurethane Foam Capacity' <br />Compressive Strength of Foam = <br />67.0 psi <br />Diameter of Pier = <br />2.875 in 0 <br />Area of Pier Bearing on Foam = <br />69.00 in' <br />Bearing Strength of Pier on Foam = <br />4623 lb <br />Factor of Safety = <br />2.0 <br />Bearing Strength of Pier on Foam = 2312 lb OK, Soil Bearing Controls <br />