effective stress (kPa) at the base of each soil layer listed below. Assume the water table rest 4 m below ground surface and that there is a capillary rise of 1 m above the water table. Provide your answers in kPa to 1 decimal place. Use 9.81 kN/m3 as the unit weight of water.   Total Neutral Effective Silty Sand: 5m thick, γt = 17.5 kN/m3, γsat = 18.5 kN/m3,  Blank 1 Blank 2 Blank 3 Clay: 4m thick, γt = 16.5 kN/m3, γsat = 17.8 kN/m3,  Blank 4 Blank 5 Blank 6 Sand: 6m thick, γt = 17.3 kN/m3, γsat = 18.1 kN/m3,  Blank 7 Blank 8 Blank 9

3.15 In a site consisting of normally consolidated clean sands, the water table is at 10 ft depth. The average unit weight of the sand above and below the water table is 111.5 lb/ft3 and 125.0 lb/ft3, respectively. At a 25 ft depth, Nso was reported as 26. Determine the following: a. (N160 using Liao and Whitman's (1986) equation for CN [Eq. (3.13)] b. D, using Skempton's (1986) correlation [Eq. (3.28)] c. Friction angle using Schmertmann's (1975) correlation [Eq. (3.30)] d. Modulus of elasticity using Kulhawy and Mayne's (1990) correlation [Eq. (3.32)]

Please show me steps I am studying for exam

2. Solve and show solution.

A certain saturated sand (S = 100%) has a moisture content of 27.9% and a specific gravity of solids of 2.61. It also has a maximum index void ratio of 0.90 and a minimum index void ratio of 0.33. Compute its relative density and classify its consistency. (Table on the right) Solution: Given the values of mmoisture content, specific gravity and degree of saturation, the void ratio can be estiamted as: e = Thus the relative density is found to be Dr = • According to the table, the soil is classified as %; soil. TABLE 3.3 CONSISTENCY OF COARSE-GRAINED SOILS AT VARIOUS RELATIVE DENSITIES (data from Lambe and Whitman, 1969) Relative Density, D,(%) 0-15 15-35 35-65 65-85 85-100 Classification Very loose Loose Medium denseª Dense Very dense "Lambe and Whitman used the term "medium," but "medium dense" is better because "medium" usually refers to the particle size distribution.

A deposit of clay lies between two layers of sand as shown in Figure 1. The lower sand layer is under artesian pressure. The moist unit weight of the sand above the groundwater table is 105 lb/ft³; below the groundwater table its saturated unit weight is 120 lb/ft³. The saturated unit weight of the clay layer is 110 lb/ft³. Determine the following: a) The vertical total stress, the pore pressure and vertical effective stress at the bottom of the clay layer. b) The height d above the ground surface of the water in the piezometer that would cause “boiling” (heave) of the upper sand layer.

The coefficient of earth pressure at rest for a sand having the Poisson's ratio value of 0.25 is. ?

Calculate the total stress, pore water pressure and effective stress at point A, D, and C. If the groundwater table drops 1 m, calculate the effective stress at point C. Will the effective stress increase or decrease? 6m Dry sand G₂=2.68 e = 0.55 Groundwater table B Saturated sand 13m G₁ = 2.75 e = 0.85 76

Subject: Soil mechanics

Adry sand is known to have an angle of internal friction equal to 36°. A triaxial test is planned, where the confining pressure will be 40 kPa. What maximum axial stress (major principal stress) should be predicted?