Laserfiche WebLink
<br />EM 1110-2-1913 <br />31 Mar 78 <br /> <br />Table 3-2. <br /> <br />Laboratory Testing of Pervious Materials <br /> <br />Test <br /> <br />Visual classification <br />In situ density determinations <br /> <br />Relative density <br /> <br />Gradation <br /> <br />Permeability <br /> <br />Consolidation <br /> <br />Shear strength <br /> <br />Remarks <br /> <br />Of all jar samples <br /> <br />Of Shelby-tube samples of foundation <br />sands where liquefaction suscepti- <br />bility must be evaluated <br /> <br />Maximum and minimum density tests <br />sho~ld be perfprmed in seismically <br />active areas to determine in situ <br />relative densities of foundation <br />sands and to establish density con- <br />trol of sand fills <br /> <br />On representative foundation sands: <br /> <br />a. For correlating grain-size <br />parameters with permeability <br />or shear strength <br />b. For size and distribution clas- <br />sifications pertinent to <br />liquefaction potential <br /> <br />Not usually performed. Correlations <br />of grain-size parameters with <br />permeability or shear strength used. <br />Where underseepage problems are <br />serious, best guidance obtained by <br />field pumping tests <br /> <br />Not usually necessary as consolidation <br />under load is insignificant and <br />occurs rapidly <br /> <br />For loading conditions other than <br />dynamic, drained shear strength is <br />appropriate. Conservative values of <br />~' can be assumed based on S tests <br />on similar soils. In seismically <br />active areas, cyclic triaxial tests <br />may be performed <br /> <br />~ <br /> <br />3-4 <br /> <br />. <br /> <br />. <br /> <br />'; <br /> <br />. <br /> <br />~ <br /> <br />.. <br /> <br />e <br />