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<br />MATERIALS TESTING SERVICE <br /> <br />, <br /> <br />the test. The axial load is applied in increments to define <br /> <br />both the-yield point and clearly show final failure of the <br /> <br />specimen. <br /> <br />. The Mohr envelopes for the comp~ession tests appear as part <br />! <br /> <br />of Figures <br /> <br />ANALYSIS OF TEST RESULTS: <br /> <br />In-CFigu:res--12 ,~"l3~and'~JA ,:':=the::test-~ole-,'l'ogs=e_v:isuaLl:y':. . <br /> <br />diplct€d-Cshowing ..:var ious~soi:i' 3lal ues-c-near.. the-individual test. <br /> <br />point. The prominent test index throughout the test program <br /> <br />i > was -the degree of. saturation -of' the fill material. In most <br />cases ,--the ._soi-l'-'€xceeds -its liquid limit, properties which <br /> <br />woulfrcausecthesoil-to flow or travel under-a small load. <br /> <br />The dam's structure seems to be confined by the downstream <br /> <br />face rip-rap material although soil flow conditions are visu- <br /> <br />ally detectable at the downstrearn, base. The triaxial tests <br /> <br />show that some cohesive material is present in the samples <br /> <br />however, the tests could not be running in the completely sat- <br /> <br />urated':'condi tionc at which. _the.._soil -was- .found-in the dam. <br /> <br />Excessive.drying of the soil structure.would cause.the-soil <br /> <br />to-compact with a resultant volume loss of 12 to 19 percent. <br /> <br />However, if the'dam were to contain enough water to utilize_ <br /> <br />the spillway exclusively for drainage, a slumping or soil <br /> <br />flow condition would result..- Prevention of .water pressure <br /> <br />ENGINEERS <br /> <br />-7- <br />