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<br />''\ "'. <br /> <br />EM 1110-2-1913 . <br />31 Mar 78 <br /> <br />Table 3-1. Laboratory Testing of Fine-Grained Cohesive Soils <br /> <br />Test Remarks <br /> <br />Visual classification and water <br />content determinations <br /> <br />On all samples <br /> <br />Atterberg limits <br /> <br />On representative samples of founda- <br />tion deposits for correlation ~ith <br />shear or consolidation parameters, <br />and borro~ soils for comparison with <br />natural ~ater contents, or correla- <br />tions with optimum ~ater content and <br />maximum densities <br /> <br />Not required; soils can be assumed to <br />be essentially impervious in seepage <br />analyses <br /> <br />Generally performed on undisturbed <br />foundation samples only where: <br /> <br />a. Foundation clays are highly <br />compressible <br />b. Foundations under high levees <br />are somewhat compressible <br />c. Se"tlement of structures within <br />levee systems must be accu- <br />rately estimated <br /> <br />Not generally performed on levee fill; <br />instead use allowances for settle- <br />ment within levees based on type of <br />compaction. Sometimes satisfactory <br />correlations of Atterberg limits <br />with coefficient of consolidation <br />can be used. Compression index can <br />usually be estimated fro~ water <br />con'tent. <br /> <br />a. Required only for compacted or <br />semi compacted levees <br />b. Where embankment is 'to be fully <br />compacted, perform standard <br />25-blow compaction tests <br /> <br />. <br /> <br />Permeability <br /> <br />Consolidation <br /> <br />Compaction <br /> <br />(Con'tinued) <br /> <br />3-2 <br /> <br />. <br />