Situation 2. A granular soil located in a borrow pit is found to have an in place dry density of 1895 kg/m^3. In the laboratory, values of dry maximum density and minimum density are determined as 2100 kg/m^3 and 1440 kg/m^3, respectively. a. Compute the relative density of the soil in the borrow pit. b. Compute the void ratio of the soil in the natural condition if the maximum and minimum densities indicate void ratio ratios of 0.28 at the max density and 0.92 at minimum density. c. Compute the specific gravity of this soil.

The properties of seven different clayey soils are shown below (Skempton and Northey, 1952). Investigate the relationship between the strength and plasticity characteristics by performing the following tasks: a. Estimate the plasticity index for each soil using Skemptons definition of activity [Eq. (4.28)]. b. Estimate the probable mineral composition of the clay soils based on PI and A (use Table 4.3) c. Sensitivity (St) refers to the loss of strength when the soil is remolded or disturbed. It is defined as the ratio of the undisturbed strength (f-undisturbed) to the remolded strength (f-remolded)) at the same moisture content [Eq. (12.49)]. From the given data, estimate f-remolded for the clay soils. d. Plot the variations of undisturbed and remolded shear strengths with the activity, A, and explain the observed behavior.

For a soil, given: D10 = 0.08 mm D30 = 0.22 mm D60 = 0.41 mm Calculate the uniformity coefficient and the coefficient of gradation of the soil. 2.4 Repeat Problem 2.3 for the following: D10 = 0.24 mm D30 = 0.82 mm D60 = 1.81 mm