P6_Soil compaction.pdf - Lecture 5 Soil Compaction Problem...

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Lecture 5: Soil Compaction Thuyloi University_ Division of Geotechnical Enigneering Page 1 Problem 1 A soil is compacted in a cylindrical mold with a volume of 1000 cm 3 at six different water contents, using the same compactive effort (Test 1). After compaction, the samples were extruded and weighted. The same test was repeated, but with a larger compactive effort (Test 2). The water contents and wet masses of the samples from the two tests are given. Water content Wet mass (g) (%) Test 1 Test 2 11 1867 1937 13 1956 2034 15 2044 2108 17 2106 2118 19 2090 2097 21 2036 2055 Compute the dry densities and plot them against the water content for both tests Problem 2 Soil excavated from a borrow is being used to build an embankment. The void ratio of the soil at the borrow is 1.14 and the porosity of the compacted soil in the embankment is 40%. If the volume of excavation is 200,000 m 3 , how many cubic meters of embankment can be built using this soil? Answer: V t = 155,763 m 3 Problem 3 The undisturbed soil at a given borrow pit is found to have the following properties: w = 15%; γ m = 19.04 kN/m 3 ; G s = 2.70. The soil from this borrow is to be used to construct a rolled fill having a finished volume of 38230 m 3 . The soil is excavated by means of a shovel and dumped onto trucks having a capacity of 3.82 m 3 each. When loaded to capacity, these trucks are found to contain, on the average, a net weight of soil and water equal to 57.85 kN. In the construction process, the trucks dump their load on the fill, the material is spread and broken up, after which a sprinkler adds water until the water content is equal to 18%. The soil and water are thoroughly mixed and then compacted until the dry unit weight is equal to 17.28 kN/m 3 .

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