Laserfiche WebLink
lanuary 14, 2003 <br />HWA Proiect No. 2002-146-21 <br />about 100 feet away &om the building. The driveway/parking azea fill near the building <br />will vary from about 3 feet near the west comer of the building to about 8 feet near the <br />south coma. <br />4.4.2 Pile Settlement <br />Based on preliminary information provided in e-mail from Brown and Caldwell dated <br />September 12, 2002, the pile grnups have dead loads ranging &nm 21 to 126 tons and live <br />loads ranging from 6 to 135 tons. Typically live loads are assumed to not bc on the <br />foundation for significant periods of time and are therefore aze not used in consolidation <br />settlement calculations. Loads that aze on the building for more than about 10% of the <br />time should be considered es dead luads. Us;ng 126 tons per pile bendgroup, we <br />calculate that the lower layer will consolidate a few tenths of an inch due to that pile <br />group alone. However, since the piles are founded high in the intermediate sand layer <br />and the building is lazge, the loads from each pile group will overlap in the lower <br />compressible layer and the lower layer will respond to the average shvcture dead load. <br />We have calculated that the building will settle relatively uniformly about 93 inch for <br />each ksf of dead load. In our opinion, the structure should be designed for 1 inch of <br />differential settlement between pile groups due to structural load. There may be <br />additional settlement due to surface loading as described later which may add to the <br />differential settlement between pile groups. <br />4.43 Fill SetUement <br />Table 2 shows the calculated amount of settlement expected in the first decade after <br />conswction per ksf of fill placed on the surface. The settlement in the lower layer will <br />affect the building and should be used in building design. The settlement in the upper <br />layer is the differential settl�nent behveen the building and the ground surface and <br />should be used for connecting utilities, walks and driveways to the building. The total <br />settlement will be the settlement of the ground surface to be used for drainage issues and <br />bending of utilities. Tapered fills, or fills of limited extent, would settle less than the <br />maximum. <br />Table 2: Surface Settlement Caused by Each ksf of Fill <br />Settlement <br />(inches/ksf of fitl <br />load) <br />Lower comprcssible 93 <br />laycr <br />Uppercompressible II.0 <br />laycr <br />Total 2D.3 <br />20021a6 rcpon • final 12 HWA GEOSCIENCES INC. <br />� <br />