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Unformatted text preview: saturation. 5. The following results were obtained from a laboratory compaction test (the volume of the mold was 943.9 cm 3 and G s = 2.64): Trial 1 2 3 4 5 6 Mass of wet soil (g) 1745 1810 1893 1939 1921 1880 Water content (%) 9.3 11.8 14.3 17.6 20.8 23.0 a) Plot the dry density versus water content curve b) Determine the maximum dry density and optimum water content. c) On the same graph as your compaction curve, plot the zero air voids (ZAV) curve (S = 100%). Are the relative positions of the two curves as they should be? d) Determine the degree of saturation at optimum. The following formulas may be useful: d = 1 + w d = w S w + w s S 6. Define phreatic surface (Section 2.1). 7. Can soil water ever be under negative pressure? How? (Section 2.1)....
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- Spring '10
- Geotechnical Engineering