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\I <br />Our Job 81-20-00 Page A- 5 <br />Consolidation Tests. The one-dirnensional consolidation <br />properties of "undisturbed" samples of alluvium obtained by means <br />of drive sleeves, were evaluated according to the provisions of <br />ASTM Test Method D2435-70. In all cases, sample diameter is 7..67.5- <br />inches and sample height is 1.00 inches. Water was added at a <br />normal stress approxinately equal to the overburden stress plus <br />the weight of the planned fi11. Exclusive of special readings <br />during consolidation rate tests, readings during an incrernent of <br />load are regularly read until the change in sanple height is less <br />than 0.0001 inch over a two-hour period. The results of the con- <br />solidation load tests are summarized on Plates A-4.1 through <br />A-4.3 - Consolidation Test Data <br />It should be noted that the graphic presentation of <br />consolidation data is, in fact, a presentation of volume change <br />with change in axial load. As a result, both expansion and con- <br />solidation can be illustrated. <br />Direct Shear Tests. Slow direct shear tests were <br />performed on remolded samples of alluviun to establish the shearing <br />strength of compacted fill under low normal stress. <br />The test is performed using remolded samples with a <br />dianeter of Z.62 inches and a height of two inches. The samples <br />were remolded on the wet side of optinum to approximately 90 <br />percent relative conpaction. After preparation, the samples were <br />placed in a consolidometer and the appropriate normal stress uas <br />applied. Each sample was then, in turn, placed in the direct shear