Laserfiche WebLink
American Property Devek....,ent ES-0599.05 <br /> January 16, 2015 Page 7 <br /> Updated January 22, 2015 <br /> Soil Nail Wall Recommendations <br /> Based on the soil conditions encountered during our fieldwork, the soil conditions are generally <br /> favorable for soil nail walls. For design purposes, the following design parameters can be <br /> considered for temporary soil nail walls: <br /> • Internal Angle of Friction 38 degrees <br /> • Cohesion 250 psf <br /> • Allowable Pullout 4.0 kips per foot <br /> • Soil Moist Unit Weight 125 pcf <br /> • Maximum Nail Spacing 6 feet (horizontal /vertical) <br /> The above design parameters are intended for preliminary analysis of a soil nail wall design. <br /> Modification of these values by the geotechnical engineer may be appropriate during the design <br /> process, based on the results of the analyses. With respect to soil nail shotcrete facing, <br /> temporary or permanent (foundation wall) facing can be considered as part of the top-down <br /> construction. The soil nail wall designer will need to consider shotcrete thickness and <br /> reinforcement requirements, as appropriate for temporary or permanent facings. <br /> Cantilever and Single Tieback Soldier Piles <br /> Temporary shoring should be designed to resist lateral soil pressure based on an active earth <br /> pressure condition. Surcharge loading from adjacent roadways or buildings should be included <br /> in the shoring design, as appropriate. For design, the following earth pressure and surcharge <br /> values should be used: <br /> • Active Earth Pressure (level backfill) 30 pcf (equivalent fluid / loose fill) <br /> • At-Rest Earth Pressure (level backfill) 48 pcf <br /> • Active Earth Pressure (sloped backfill, 1:1 max) 50 pcf* <br /> • At-Rest Earth Pressure (sloped backfill, 1:1 max) 70 pcf* <br /> • Traffic Surcharge (where appropriate) 70 psf (rectangular distribution) <br /> • Preliminary Building Surcharge (where applicable) 125 psf (rectangular distribution)** <br /> • Passive Resistance (Apply over 2 pile diameters) 400 pcf <br /> *Preliminary values, based on ten foot high broken slope above shoring. Values should be reevaluated based on <br /> final slope geometry. <br /> **Building surcharge values should be reevaluated based on further assessment of adjacent building foundation <br /> levels, proximity, and loading. <br /> Earth Solutions NW, LLC <br />