Laserfiche WebLink
1 <br /> � y,ravel deposits, or on struc[ural fill. Where footings are suppor[ed on fill, <br /> the zone ot s[ructural fill should ex[end a dis[ance equal to the [hickness of <br /> the fill beneath the footing beyond [he near Eooting edges. Cri[eria <br /> � for the selecti.on and placement of this fill are presented above under SITE <br /> PREPARATION ANJ EARTHWORK. :1ll foo[ing excavations should be exami.ned by a <br /> � member of our staff during final preparation of the bearing surface [o de[er- <br /> mine tha[ suitable soils have been exposed. <br /> IWe recortunend that all spread foo[ings have a minfmum depth of embedmen[ <br /> beloa lowes[ adjacent. graae of 18 inches. Continuous wall footings should <br /> � have a minimum width oE 18 inches, c:hile individual column Eootings should <br /> have a minimum width of 24 inches. Footings supported as recommended above <br /> may be proportioned using the allowable bearing values presented in Table 2. <br /> � ihese bearing values are for the total o[ dead and long-term live loads, ex- <br /> clusive of the weight oE the footing and any overlying backfill. The values <br /> Imay be increased by one-[hird when considering loads of short duration such <br /> f <br /> as wind or seismic Eorces. <br /> I1'able 2 - Foundation Design Criteria <br /> A. Footings supported on medium dense to very dense native glacial til] <br /> Ior uutwash sand and gravel deposits. <br /> .411owable IIe�ring Value (psf) <br /> ICon[inuous Individual <br /> Footing Width Wall Column <br /> I (fce[) Footings Footin�s <br /> 1 .5 5,000 �/p <br /> z 5,500 5,000 <br /> I3 7,000 6,000 <br /> 4 8,000 7,000 <br /> I5 or larger 8,000 8,000 <br /> B. Footings supported un structural fill. <br /> IAllowable bearing value = 3,000 psf (all footing types and sizes) <br /> Fuoting settlements are expected [o occur rapidly as loads are applied <br /> � due to the granular nature of the foundation soils. We es[imate that more <br /> heavily loaded continuous wall and individual column footings supported on <br /> native soils cuuld experience on the order of 1/4 inch, and 1/4 [0 3/4 inches <br /> uf se[tlemen� . respec[ively. Similarly, more heavily loaded con[inuous wall <br /> - 9 - �7� <br /> GeoEnglneers <br /> Incorporoted <br />