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geo cheat sheet - Derived Equations assuming Vs=1 Specific...

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Derived Equations assuming Vs=1 Specific surface=volume/area for clay Soil classification Sieve Identification inch mm 3 in 3 75 2 in 2 50 1.5 in 1.5 37.5 1 in 1 25 ¾ in .75 19 3/8 in .374 9.5 #4 .187 4.75 #8 .0929 2.36 #10 .0787 2 #16 .0465 1.18 #20 .0335 .85 #30 .0236 .6 #40 .0167 .425 #50 .0188 .3 #60 .00984 .25 #100 .00591 .15 #140 .00417 .106 #200 .00295 .075 USDA Classification find percents at 2mm .05mm .002mm AASHTO Classification find percents at Sieve #10 #40 #200 USCS Classification find percents at #200 #4 3-in Compaction RQD=sum of broken length over 4in over total length times 100
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Obsidian- igneous high strength rapidly cooled Red sandstone- sedimentary decent strength made up of sand particles Slate- sedimentary made up of silt particles low strength Pumice- volcanic low strength aerated rock from volcano Biotite granite- igneous high strength slow cooled rock Dolomite marble- high strength metamorphic Aeolian soils- soil deposited by wind and produces very poorly graded soil Alluvial soils very common soil for engineers transported by streams and rivers Lacustrine soils- soil deposited beneath
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