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Penetration Resistance and Soil Properties(Peck, et al) <br /> Sands Clays <br /> Blows per foot(N) Relative Density Blows per foot (N) Consistency <br /> Less than 2 Very Soft <br /> 0-4 Very Loose 2-4 Soft <br /> 4-10 Loose 4-8 Medium <br /> 10-30 Medium 8-15 Stiff <br /> 30-50 Dense 15-30 Very Stiff <br /> Over 50 Very Dense Over 30 Hard <br /> Plasticity Chart <br /> 60 <br /> For c assification of f ne- rained soils oe/ <br /> and f!ne-grained fraction of coarse-grained / <br /> H 50' <br /> soils <br /> a. Equation of A'-line <br /> x Horizontal at PI=4 tc LL=25.5> `� <br /> J j , <br /> w then PI=0.73 (_�-20) `C <br /> 0 40 <br /> Z Equation of"Llm-line <br /> Vertical at LL=16 toPI=7 <br /> > then PI=0.9 (LL-8) / <br /> 30 <br /> 3 / <br /> -40 <br /> 20 ,� MH oR OH <br /> o <br /> 7 -- - �LOR pL <br /> 4 -- i <br /> f <br /> 0 <br /> 0 10 16 20 30 40 50 60 70 80 90 100 110 <br /> LIQUID LIMIT (LL) <br /> References <br /> American Society for Testing and Materials, 2011. Standard Practice for Classification of Soils for <br /> Engineering Purposes (Unified Soil Classification System). May 1. <br /> Peck, Ralph B., Foundation Engineering, Second Edition, John Wiley& Sons, 1973. <br /> Page 2 of 3 <br />