10-m-thick layer of stiff saturated clay is underlain by a layer of sand. The sand is under artesia ressure. A 5.75-m-deep cut is made in the clay. Determine the factor of safety against heaving at poi . Hint: F.S. = olu. Psat = 1925 kg/m³ 5.75 m 10 m 6 m 2.5 m Psat = 1840 kg/m³ Saturated clay Sand

Find h ?if the effective stress at bottom=200.85 kN/m². clay Y=18 kN/m³ @=12% 3m 3m 4m Silt G-2.71 S= 70% e = 0.6 Silt Capilary layer.zone Sand RF 72% n = 33% G= 2.68 max = 0.75 e

Y=15kN/m³ 몰 Y = 12.5 kN/m³ 0 p = 150 kPa e.= 0.95 C₁ = 0.62 Cv=0.135 Y=27.5 kN/m³ sand 9m Clay Bedrock 25,000 KN ↑ 3m 18m ↑ 5m ↓ A) What is the induced stress so (in kPa) at the midpoint of the clay layer from the point load? B) What is the change of void ratio, se, in the clay layer because of the point load. c) Calculate the settlement (in the nearest cm) at the clay layer because of the point load. Use the one layer approach. D) while the one-layer approach is not accurate to represent the distributed stress from the point load, how many layers would be proper?

A 25 m thick layer of clay with a saturated unit weight of 21 kN/m³ is underlain by a layer of sand, as shown in the Figure. The sand is under an artesian pressure. 1. Determine (by calculations) whether the bottom of the excavation will heave or not when no water inside the excavation (h=0). 2. The height of water in the excavation (h) for ó = 0 at the base of clay layer. 6 m 25 m 13 m 12 m W.T. Clay Sand