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<br /> <br />EM 1110-2-1913 <br />31 Mar 78 <br /> <br />Table 2-5. <br /> <br />Preliminary Appraisal of Foundation <br /> <br />Method <br /> <br />1. <br /> <br />Split-spoon penetration <br />resistance <br /> <br />2. Natural water content of <br />disturbed or general <br />type samples <br /> <br />3. Hand examination of dis- <br />turbed samples <br /> <br />4. Position of natural water <br />contents 'relative to <br />liquid and plastic <br />limits <br /> <br />5. Torvane or pocket <br />penetrometer tests on <br />intact portions of <br />general samples or on <br />walls of test trenches <br /> <br />Remarks <br /> <br />l-a. Unconfined compres <br />tsf, of clay is about <br />blows per foot, or N/ <br />erable scatter must be <br />Generally ,not helpful <br /> <br />. <br /> <br />trengths <br /> <br />-", <br /> <br />ive strength, <br />/8 of number of <br />, but consid- <br />expected. <br />here N is low <br /> <br />",,' <br /> <br />I-b. In sands, N valu <br />about 15 indicate low <br />ties. N values shoul <br />estimate relative dens <br />quake design <br /> <br />2. Useful when consider d with soil <br />classification, and pr vious experi- <br />ence is available <br /> <br />s less than <br />elative densi- <br />not be used to <br />ties for earth- <br /> <br />3. Useful where experie <br />are available who are <br />estimating soil shear <br /> <br />4-a. Useful where previ <br />is available' <br /> <br />4-b. If natural water c ntent is close <br />to plastic limit found tion shear <br />strength should be hig <br /> <br />4-c. Natural water cont nts near liquid <br />limit indicate sensiti e soils usually <br />with low shear strengt s <br /> <br />ced personnel <br />killed in <br />trengths <br /> <br />us experience <br /> <br />. <br /> <br />5, Easily performed and inexpensive but <br />results may be low; us ful for pre- <br />liminary strength clas ifications <br /> <br />2-10 <br /> <br />.' <br /> <br />. <br />