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The LRFD resistance factors listed in Table 7 are consistent with AASHTO 10.5 and should be used when <br /> evaluating the three limit states for soldier pile/shaft foundations. <br /> TABLE 7. LRFD REDUCTION FACTORS FOR SOLDIER PILE FOUNDATION RESISTANCE FACTORS <br /> Resistance Factor- Resistance Factor- Resistance Factor- <br /> Limit State Passive Earth Pressure End Bearing Shaft Friction <br /> Strength 0.75 0.5 0.55 <br /> Service 1.0 1.0 1.0 <br /> Extreme 1.0 1.0 1.0 <br /> Wall drainage should be incorporated into the design.We anticipate that permanent concrete facing will be <br /> constructed in front of the new soldier piles. <br /> Lateral load response of the drilled shafts can be evaluated using the L-Pile parameters presented in <br /> Table 8. <br /> TABLE 8. LPILE INPUT PARAMETERS <br /> LPILE Parameters <br /> Effective Soil <br /> Friction Cohesion, P-Y Unit Modulus, Strain <br /> Depth USCS Angle c Curve Weight k Factor, <br /> (feet) Soil Unit Soil Type (degrees) (psf) Model (pcf) (pci) sso <br /> Loose to <br /> 0 to 5 medium dense SM 30 Sand 120 25 <br /> fill <br /> 5 to 15 Medium Dense SM 33 Sand 125 60 <br /> weathered till <br /> 15 to 50 Till SM 40 Sand 62 100 <br /> Notes: <br /> pci-pounds per cubic inch <br /> A P-multiplier of 1.0 may be used as the soils are not subject to liquefaction. <br /> Lagging <br /> Permanent lagging may consist of timber, CIP concrete or pre-cast concrete. If timber is used for the <br /> permanent lagging, it must be adequately treated for protection against water and decay. We recommend <br /> that the permanent lagging be designed for uniform pressures equal to one-half the full static earth <br /> pressure (Strength Limit) or one-half the full combined active and seismic earth pressure(Extreme I Limit). <br /> This pressure reduction is based on a maximum center-to-center pile spacing of 8 feet. If a wider spacing <br /> is desired, GeoEngineers should provide guidance on modifying the lagging pressures. <br /> The space behind the lagging should be packed full with soil as soon as practical. Placement of this material <br /> will help reduce the risk of voids developing behind the wall. The workmanship associated with lagging <br /> installation is important for maintaining the integrity of the excavation. Lagging should be installed promptly <br /> after excavation, especially in areas where perched groundwater is present or where clean sand and gravel <br /> soils are present and caving soils conditions are likely. <br /> GEOENGINEERS_g April 14,2017 Page 17 <br /> File No.2095-032-00 <br />