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1 <br /> � I�i_urr IU prc;cnu :iIL,��;ihlc ,nil he;irin^_ ��,ilu��; a; :� (unctiun u��c.tim;uc�l .culrmcnt t,�� � �tin ; hra:in� <br /> on [hc ��cn� dcnsc glucial dcpo,it; at a �cpth uf -�0 tu �U fcct bclo�c c.�istine �si.i�k. Au ;uuctur.tl illl <br /> I sliould be placed bclow footings when usin, thcse desi�:n ��alucs and all disturbed soil must bc rem������ <br /> Gom footing exca�'auuns prior to placing concrcte. IF addi[ional escavation is requimd, dte fo��r,ne <br /> excavation can be b�ick�illed �vi[h up to [�eo feet of lean concrete or con[roiled densi,�� fill (\�'SDUI <br /> � Specif ication '_'-09.3(1 jI: with no chanee to the recommended allowable soil bearing value. The wci��ht of <br /> soil abo�c the tuutin�t m.ry be neglected in design. <br /> ( Pootines designed for lu�cer bearine pressures can be supported on structural fill ��here foating; are <br /> � required at hiehcr cicvatiuns (lighth loadcd f�ow�d:I1100 CIl'ITII'1115 SUC{7 8S SI11f\1CIIS� loc:ilized �valis. cce.1. <br /> Pootings supported on ,tructurul �ill should bc designcd fur an ;illu�cablc b�arine �':iluc ul 6.00p puund-; <br /> � per syuare foot(ps�). l�hc allo�cablc soil bcarine vulucs uppl}� to tlm nual o(�Jcu�l ,mJ lun_tcnn licc loadi <br /> and may be incrcased by up tu onc-third ti,r «ind or scismic loa�l;. <br /> IStructural Mat Foundations <br /> Concrctc sU�uctur,�l mat fuund;uion, in:n hucc Il:n buuonu �,r m;n� La thickcn�d bclu��� thc periincier :in�i <br /> interior walls or �rc:is ol conccntratcd Io;iJim�. �1'c rccomiucml that thc buttum of thc ma[ bc IuundrJ :it <br /> � Icasi 13 inches b�lo�e thc ;�Jj;icent finishcd :a;�Je. �i,u �i>unJalions ma� be desiuned usine an allu«ublr <br /> soil bc�rin�, pressw'c af I'_.U00 �,st: I'hi; auluc includes ;i factur of sufen of:it Ica,t ;. 'I h� allo��;�hlc ,��il <br /> � bcaring valuc :�pplics i�� tl�� �ai.il uf dc;�d :in�l lun_ triiu li�� lo;�d, :ind m:�c hc incrcnscd 6c onc-tliird ���r <br /> �cind ur seismic loads. <br /> A structurul m;u foundatiun can hc ��alu:nc�l u� ;i bc:un un ;�n rLutic f�>und:uiun :is,umim� u sub�rudc <br /> 1 ntodulus of IUO puunds per cuhi� ind� Ipeil. Thi, nw�luliu ol ;ub�srnde rcuctien corrr,punds k� ❑n <br /> allow:tblc soil hcarinz ���ilu� nf I�.000 psl und ,ctticmcm un thc onlcr of I inch. <br /> � Lateral Resistance <br /> Lateral Ibunda[ion loads muc hc resistcd b� p:�s;i�c resismnce on thc sidc; e�thc footines und b�� I�ri�tinn <br /> � on thc basc of thc (oo[ings. 1�'or foutings supporteJ in accord:incc ��ith our rrcommrnd:uions. thc � <br /> nllu�+'��ble li�iction;�l resistence ma)' be computed u5im� a coeiliciun of fi�iciion uf O.�t :y�plicd to �crucul <br /> dcad-load forces. I <br /> � The allow,�blc pussive resisGmce may b� computed usine un cyuiculent tlui�l dcnsi�� ul J00 pounds per <br /> cubic Ibot (pct) if�hc liioting is poureJ directly against undisturbed nx[i��e soils. A1'e rccommend usin�� a <br /> � p;i;sive coefficient oF sub_r;�Je rextion uf 1=0 pci ue:iinst undisturbed na[ive soil=. If the footing is <br /> � ;urruundcd b�� suuctural IiIL dic allo��:ible passive resistance may be cumputed usin�� 300 pcf. The <br /> � ,tnictural �ill should esrenJ out from �he I�ce of the foundation element tor a distance at Icast equal to <br /> 4 thrce timrs thc h�i��ht uf the clem�m ;m� be compacteJ to ut least 9� pereent o(the MDD in accordance <br /> with :1STbl DI»7. 'I�he aboce eoeliicient o( Iriction and passive equivalnn[ fluid density vnl«es can bc <br /> combined end include a t:'ictur �;f sa��ty oF:ibout 1 S. AVe recommend die upper foo[ of s'oil bc neglected <br /> ��h�n calcul:uin�� avail.�bl� p;usive resistance bencath the -l-inch Iloor slab. The allu��able passice and <br /> '� trictiun v�lucs c;ui be incre�ised b�� ono-third Ibr��ind .md �eismie lo.ids. <br /> Construction Considerations <br /> � �fh� �i�otin� subcraJe soils (or the :lcutc Care To�rcr und parking c:�raee m:w be susccptible tu <br /> disturbancr b� coiuuurtiun acti�itics ur ��hcn �vet. Iherefore. to protect the fuotine �ub�_rade. «e <br /> rccommend plxing ❑ lean cuncrete "mud mat" or � thin la�er o( Iesn conerete on the buttom of the <br /> � . ,,. .,, ;U"i.1-�)�I;-uU PurC IJ GEOENGINEE85� <br /> �lu��iis! iA 'U!'G <br />