Laserfiche WebLink
;,,; <br /> r: <br /> i_.,... �� <br /> R <br /> 1 <br /> ����qypG �. . <br /> C r+ y <br /> .. ���E� t , .. . - 'N'2 . ..+;�a^3� ..;.�vp�v�gt..�« .�w,rtks-.-4,r,:. <br /> 'fl�� W��.. �r,. . <br /> W <br /> �. , r <br /> �p� ' � Geo�Gngiuceis <br /> Qpq g � � (pcf) , where footings are placed neat (i.e. , in direcC r_ontactl against <br /> IIM��y ff <br /> �y� ` I.� the dense glacial till. A value of 300 pcf may be used for footings <br /> M <br /> , � placed neat against the weathered till or confined by structural fill <br /> � ���� � � ` compacted to 95 percent of CIDD. Passive pressure resistance sl�ould be <br /> A <br /> � calculated from the bottom of adjacent floor slabs or paving or below a <br /> ��� ; ! a depth of 1 foot where the adjacent area is vnpaved, as appropriate. <br /> - Frictional resistance may 6e evaluated using 0.4 for the coefficient of <br /> �� <br /> �„� base friction against footings and the building slab. The above values <br /> incorporate a factor of safety of about 1.5. . <br /> � c <br /> j-a AL�AINING WALLS � <br /> , The extent Lo which retaining walls may Le required has not beeri i <br /> f� <br /> (� defined at this time. As a general guideline, freestanding cantilever <br /> � recaining walls supporting structural fill should be designed for lateral i <br /> ` ` pressures based on an equivalent fluid density of 35 pcf. If tlie walls <br /> � 1 � <br /> -._-� ,' are restrained Lrom movemenC during Uackfilling, design pressures should <br /> ��, ' F-i be based on a fluid densiCy of 50 pcf. These values apply to fill placed I <br /> ; �� � and compacted as recommended above, with thr exception that fill within a <br /> �' t ` 1 <br /> � � distance equal to Clie wall lieight behind tlte wall should be compacted to <br /> I! , ��1 . � g2 percenC of MDD. Care nust be taken by the contracCor to avoid <br /> i � overcompTction, particularly if Clt2 walls are restrained. , � <br /> IS � <br /> � The recommended fluid densities assume a free-draining condition I <br /> I �� beltind Che wall. This may be accomplished by placing a 12- to 18-inch- I <br /> i � i wide zone of sand and gravel conCaining less than 5 percent fines against I <br /> i � � � <br /> 1 the wall. A perforated drainpipe sloped to drain and leading to a <br /> I �� <br /> � 1 suitable dischargc should be installed along the Uase of the wa . <br /> � �ssive <br /> The values for soil bearing, frictional resistance and p� <br /> ' � 1�� � t pressure resistance preseitted for the foundaCion design are applicahle to � �. <br /> � <br /> ` �a the retaining wall design. . ' <br /> i <br /> ,+� �: q PAVIiMh"NT SUBGFtAUE , i� <br /> � ns We recommend that pavement suh�rades Ue prepared in accordance with <br /> Lhe p1eviously described siCe preparaCion and structural fill recommenda- - . i <br /> ' � i <br /> j� tions. If the pavemenC suUgrade cansisCs of the weathered till soils, wc <br /> recommend thaC Lhe top 12 inches be compacted to a density of at least i <br /> � 11 <br /> I. <br /> li � <br /> i � <br /> y <br /> � .. . .. .. . — � — _- "-� - �t=S'S�'_i�}'.-�+.q;'�'•'�.`-`sj '�� �'I <br /> A � . � . . , , . , <br /> I <br />