Laboratory tests were performed on a compaction material give the following information:
• Bulk unit weight = 18 kN/m3
• In-situ water content = 10%
• Specific gravity of soil solids = 2.70
• Atterberg Limit: LL = 25%, PL = 22%
• Particle size distribution curve (on the next page)
a) Using the above information, classify the soil using the Unified Soil Classification System (the latest update of the Casagrande extended soil classification system)
b) Evaluate the weights of clay solids, silt solids, sand solids and water for every 1m3 of the soil
c) The specification for the properties of the compacted soils are as follows:
• Dry density = 17.5 kN/m3
• Degree of saturation = 90%
Estimate the weight of water which needs to be added to every 100 kg of the in-situ soil during
compaction in order to achieve the specifications.Homework Help2 months ago
a) Calculate the total horizontal stress σh at Points A, B and C assuming capillary rise is
developed to 1m above the original groundwater table.
Unit weight of water can be assumed to be 10 kN/m3.
b) If the water table rises to 1m above the ground surface, re-calculate the effective stress at
Points A, B and C and comment on the effect of the water table change on the soil strength.
The bulk unit weight at Point A can be assumed to be 19 kN/m3 when fully submerged.
((the figure is attached below))Engineering2 months ago