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
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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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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