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Qpsoilclay

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  1. *Phases of soils–12: Identify the wrong piece of data. (Revision: Sept.-08) A project engineer receives a laboratory report with tests performed on marine marl calcareous silt). The engineer suspects that one of the measurements is in error. Are the engineer’s suspicions correct? If so, which one of these values is wrong, and what should be its correct value? kN m kN m Given unit weight of sample 18.4 3 unit weight of solids 26.1 S 3 w e S water content voids ratio degree of saturation 40% 1.12 95% Solution: Check the accuracy of 4 out of 5 of the variables using, 0.95 1.12 S Se wG Se 1.06 26.1 9.81 S wG w 0.4 1.06 Therefore, these four are correct. S w 3 . The only possibly incorrect value is . Assume that = 1 m V 3 V 1 m V V V 1 a w S V V V but e 1.12 0 V V 1.12 V 2 a w S S 3 3 3 V 0.472 m , V 0.528 m but V 0.95 V 0.502 m S V w V 3 V 0.026 m a kN m 3 W V 26.1 0.472 m 12.3 kN S S S 3 kN m 0.40 12.3 4.9 W wW kN w S 3 W refore, the actual unit weight of the soi 17.2 1 V m 12.3 kN 4.9 kN 17.2 kN l is, kN m The W kN k m N 17 . 2 18.4 3 3 3 32

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