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' <br />' <br />I' � <br />I' <br />I' <br />I� <br />I' <br />I� <br />� <br />� <br />January 22. 2003 � <br />HWA Pmject No. 200Z-IR5 � <br />��. <br />At this site, we recommend the use o( I3 to.l S-inch'iliamctcr<merr-cast concrcte piles. <br />These piles, drilled to penetratc at Icast 25 Icct into th� �rr�' ilrnsc nati�'e Ad�.mce <br />Ouhvash soils, would bc caipahlc uf dc��cloping thc alluaahlc capacitics shu�cn in Tablc <br />I. These capacities make an allo�cancc liir the potcnlial Jo���nch ag or nceati� c skin <br />f'riction associated witli tlie ��olentially compressible soils aho�•e Ihc AJvance Out�cash. <br />The geotechnical consultant should nwnitor thc ehillinu acti� ilics to cnsuro adcyu:ue <br />depth into competenl bcaring materiul is rcachcd. <br />Pilc Uiamelcr <br />l2 <br />14 <br />14 <br />iG <br />16 <br />IS <br />Tablc I. AOo��:iMlc Au�cr-Casl Pilc Capacilics <br />!?mbcdtncut Ucpth <br />25 <br />30 <br />�g <br />25 <br />311 <br />311 <br />'1'olal Dcpih � Allo��ablc <br />611 <br />;; <br />GII <br />5$ <br />60 <br />55 <br />fill <br />We uscd thc computcr program LPILL'• Plus 4.0 (Gnsoll. Inc., 2000) tu e�-aluatc thc <br />behavior of latcrally loadcd uugcr-cast pilcs, varying li'om I U-inchcs l0 13-inchcs <br />diatncter, assuming frcc-hcaJ conditions at tlic pilc hcad. for thcse analyscs, ��•c assumed <br />a design axial cotnpression of 50 kips, a muximum laterd luad ol' 10 kips, pile length of <br />50 feet, and the soil parameters indicateJ on Fi��uro 4, Lateral I'iIc Capacitics. W'e also <br />assumcd thc pilcs �vill bc consUucicd such that thcir lops arc Ic��cl �eith thc cxistin� <br />ground cicvalion. Thc cstimatcd dcllcction, bcnding nwmcnl, and shcar respunsc. I'or a <br />rangc ofpilc diamcicrs, is prescntcd in I�igurc 4. Uur analyscs also assumed thc pilcs <br />would have ccntcr-to-c�_ntcr spacin��s of nut Icss than Uircc pilc diamctcrs. If closcr piic <br />spacings arc rcyuircd, wc sliould bc cuntactcd to rcvisc our ancdyscs and account fi,r <br />givup elTects. Analyses werc also performed �iir dcsign asial compression uf ;0 and 40 <br />kips, which gavc similar ��alucs as thc �malyscs liir 50 kips. <br />Site gradcs should not Ue built up aUovic existing 3radcs in thc vicinity of thc building, in <br />order in pre��ent additional surchargc luads on thc piles. <br />Auger-casl concrele piles are inslalled by rolating a continuuus-lli��ht, hollo���-stem, auger <br />lo a pracletcmiincd dcpth. Whcn thc dcpth is rcachcd, a high strcnglh sand-ccmcnl grout <br />is pumped, undcr controllcd pressurc, throu�,h thc ccnlcr of thc slialt as thc au��cr is <br />slowly withdra���n. E3y maintaininS pressurc in lhc grout linc and c�tracting thc au�cr no <br />lastcr th.ui an cyuivalcnt volumc uf grout is pumpcd, a continuous culumn uf concrrtc is <br />21102-13> Suppl LR.doc 6 II\1'A GcoScicnces Inc. <br />�� <br />