A sediment settling lagoon has a depth of water of 4 m above the clay base. The clay layer is 3 m thick and this overlies 4 m of medium sand, which in turn overlies impermeable rock. Given the unit weight of clay, medium sand and sediment of silty fine sand is 18 kN/m², 20 kN/m³ and 16 kN/m², respectively. Calculate the effective stress at the top of the clay and at the top and bottom of the second layer under the following condition; i) initial, before any sediment is deposited. ii) After a 2m layer of sediment of silty fine sand has been deposited. iii) After draining the lagoon down to base level, with the same thickness (2m) of sediment still in place
A sediment settling lagoon has a depth of water of 4 m above the clay base. The clay layer is 3 m thick and this overlies 4 m of medium sand, which in turn overlies impermeable rock. Given the unit weight of clay, medium sand and sediment of silty fine sand is 18 kN/m², 20 kN/m³ and 16 kN/m², respectively. Calculate the effective stress at the top of the clay and at the top and bottom of the second layer under the following condition; i) initial, before any sediment is deposited. ii) After a 2m layer of sediment of silty fine sand has been deposited. iii) After draining the lagoon down to base level, with the same thickness (2m) of sediment still in place
Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN:9781337705028
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter2: Geotechnical Properties Of Soil
Section: Chapter Questions
Problem 2.8P
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A sediment settling lagoon has a depth of water of 4 m above the clay base. The clay layer is 3 m thick and this overlies 4 m of medium sand, which in turn overlies impermeable rock. Given the unit weight of clay, medium sand and sediment of silty fine sand is 18 kN/m², 20 kN/m³ and 16 kN/m², respectively. Calculate the effective stress at the top of the clay and at the top and bottom of the second layer under the following condition;
i) initial, before any sediment is deposited.
ii) After a 2m layer of sediment of silty fine sand has been deposited.
iii) After draining the lagoon down to base level, with the same thickness (2m) of sediment still in place
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