Answer Happy

) a) Explain the following earthworks terms with the aid of a sketch: i) Bulking and ii) Shrinkage. b) A one metre deep cut is excavated across an entire 3.0 acre site. The average bulk density of this soil is 1.89 Mg/m³ with an average moisture content of 9.6 %. If this soil is compacted on average to 93% of its maximum dry density as determined by the Modified Proctor test*, compute the volume of compacted fill in m³ that will be produced from the excavation. Note: 1 acre = 4047 m², *Modified Proctor maximum dry density = 2.00 Mg/m³ at an optimum moisture content of 6.3 %. c) The Proctor curve for the above soil is shown in Figure Q4c. If the moisture content prior to placement and compaction had reduced to 8.1 %, discuss if the soil can be compacted to the average dry density specified in part (b)? 2.200 2.000 1.800 1.600 1.400 1.200 1.000 6.00 7.00 8.00 9.00 Moisture Content (%) Figure Q4c. i) How the dry density versus moisture content relationship varies as the compaction energy increases. ii) Why continuing to compact soil after the specified dry density has been achieved may result in less stable soil. Dry Density (Mg/m²) 4.00 5.00 d) Using appropriate illustrations explain: