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project No. 90161.e <br /> 7 June 1990 <br /> Rstainin walls <br /> 1, Retaining walls should be designed to resist lateral <br /> w- <br /> an equfluid weight <br /> ivalent <br /> pressures exerted from a_media having <br /> as follows: c.f.) <br /> uivalent fluid Freight (p• <br /> gradient of. backslope - eq <br /> 35 <br /> Flat <br /> 60 <br /> 2.1 <br /> 80 <br /> 1 1/2:1 <br /> add an additional 10 H p.s•f• over the <br /> F � <br /> For restrained conditions, Lateral forces on the <br /> entire retaining height (H) of the wall. <br /> a <br /> walls will be resisted by a passive equivalent fluid <br /> retaining soil <br /> weight of 250 p.c.f• , for either compacted fill or existing <br /> w g feet. The friction <br /> and 350 p.c•f. for depths greater than 2 1£ friction and <br /> footings <br /> factor at the base of the wallheais value should be <br /> passive pressures are combined, the larger <br /> d a retaining wall <br /> 50%. All backfill placed behin <br /> ' reduced by <br /> the grading section of this <br /> should be compacted according <br /> to <br /> report-- The allowable bearing pressure and the depth of <br /> p foundation <br /> foundation should be as given for general <br /> recommendations. <br /> above criteria is based on fully drained conditionsz_i: For <br /> 2, The placed <br /> -_-- - we recommend that a filter material be pla - _ ----------- <br /> - these-- _-- - --___-- __-- <br /> conditi ns,... <br /> The blanket of filter material should a -a <br /> behind all walls. the full height <br /> minimum of 12 inches thick and should extend <br /> 14 <br />