A fine-grained soil has a liquid limit of 200% and a plastic limit of 45%. The natural water content of the soil in the field is 60% and the clay content is 63%
a) calculate the plasticity index, the liquidity index, and the activity
b) What is the soil state (e.g., liquid) in the field?
d) The soil is under a rectangular concrete slab 15m x 50m, used as a foundation for a building. A water pipe, in diameter id located in a trench 450mm below the center of the slab. The trench running along the length of the slab,300mm wide and 450mm deep, was backfilled with the same soil. If this pipe were to leak, what effect would it have on the foundation?
* if you could please draw a sketch of the existing trench and pipe, and show in another sketch hou you would mitigate an water related issue form the the and the soil. Explain why your mitigation method is better than the existing construction.