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<br />47 <br /> <br />-=4 <br /> <br />Table 6,2, <br /> <br />Unified Soil C1~ssification System <br />(ASTM - CO 2~87) * <br /> <br />Soil <br />Type <br /> <br />Group <br />Symbol <br /> <br />Description <br /> <br />GRAVELS <br /> <br />SANDS <br /> <br />GW <br />GP <br />GM <br />GC <br /> <br />5W <br />5P <br />5M <br />5C <br />Ml <br />Cl <br /> <br />Well graded gravels and gravel san~ mixtures, little or not fines. <br />Poorly graded gravels and gravel sa d mixtures, little or no fines. <br />Silty gravels, gravel-sand-silt mixtur s. <br />Clayey gravels, gravel-sand-clay mix ure~;. <br /> <br />Well-graded sands and gravelly ~,an~s, little or no fines. <br />Poorly graded sands and graveliy sa,nds, little or no fines. <br />Silty sands, sand-silt mixtures. ' <br />Clayey sands, sand-clay mixtUl'es. <br />Inorganic silts, very fine sands. rock; flollr, silty or clayey fine sands. <br />Inorganic clays or low to medium i plasticity, gravelly clays, sandy clays, silty clays. learl <br />clays. <br /> <br />FINE GRAINED <br />SILTS AND <br />CLAYS <br /> <br />Organic silts and organic silty days jof low plasticity. <br />Inorganic silts, micaceoys or diatonldceous fine sands, or silts, elastic silts. <br />Inorganic clays of high plasticity, fa( clays. <br />Organic clays of medium to high pl~lsticity. <br /> <br />_______-----1-____ _______ "_.._".__._.________ _~___.____.__..__________._..._ <br />. Several standardized tests are required to positively identify a specific: soil class. <br /> <br />Ol <br />MH <br />CH <br />OH <br /> <br />Table 6,3. Effective Equivalent Fluid Weight for AssQmed Soil Water loading Conditions, <br /> <br />Soil-water Loading <br />Condition <br /> <br />Assumption <br /> <br />Yeq <br /> <br />h 0.25 H <br /> <br />Table 6a <br /> <br />0.25 h h 0.75H <br /> <br />h 0,75 H <br /> <br />Full soil height to <br />elevation of free <br />water surface (a=H) <br /> <br />Ignore soil and <br />apply factor <br /> <br />1.1.5 x Yw <br /> <br />Ignore soil <br /> <br />Yw <br /> <br />Table 6.4. Drag CQefficients. <br /> <br />I' , I <br />-~} <br /> <br />I~I <br />~J, <br /> <br />ON E EDGE <br />ON GROUND <br /> <br />ABOVE GROUND <br />h' ~ O.25h <br /> <br />WATER NORMAL TO fACE <br /> <br />Width to hei~ht ratio b/h _"__~-======:~:,=~===::=-,=========~-=:,=~~= <br />Wall above ~ro~ ~n "~!~"~d.:=r== ______~______________.!?ra~ Coeffici(>:.!!!._~<l,- <br /> <br />From 0.5 to 6 <br />10 <br />16 <br />20 <br />40 <br />60 <br />80 or more <br /> <br />From 1 to 12 <br />20 <br />32 <br />40 <br />80 <br />120 <br />160 or more <br /> <br />1.25 <br />1.3 <br />1.4 <br />1,5 <br />1,75 <br />1,8 <br />2,0 <br />