Question

43. The porosity and specific gravity of solid of a sand lying
below a masonary dam os 40% and 2.67 respectively. The
maximum permissible upward gradient with a factor of safety
4 is
(A) 0.25
(B) 0.5
(C) 1.0
(D) 4.0​

Answer 1

Answer:

A double draining clay layer, 6 m thick, settles by 30 mm in three years under the influence of a certain loads. Its final consolidation settlement has been estimated to be 120 mm. If a thin layer of sand having negligible thickness is introduced at a depth of 1.5 m below the top surface, the final consolidation settlement of clay layer will be

60 mm

120 mm

240 mm

None of these