Assignment 1 Due date 24th April 2013 Weighting 15% Linked to learning outcome(s) 2, 3, 5 &6 1. The solving procedures must be provided. 2. Rational assumption(s) can be made if given information is not sufficient. 3. The assignment will be only marked in terms of “Grade”. Question 1. [Week 2] An undisturbed cylindrical soil sample is 60 mm in diameter and 152 mm long. It has a mass of 816 g. After finding the mass of the entire sample, a small portion was removed and a moisture content test was performed on it. The results of this test on the subsample were: Mass of can = 22.01 g Mass of can + moist soil = 124.97 g Mass of can + dry soil = 112.72 g Calculate the water content (w), the bulk unit weight (?) and the dry unit weight (?d), void ratio (e) and percentage of saturation (S) for the sample. (Gs = 2.7)
Question 2. [Week 3] A series of modified Proctor tests have been performed on a soil that has a Gs of 2.70. The test results obtained are as follows: The mass of the empty mold was 1.970 kg. Determine the maximum dry unit weight (kN/m3) and the optimum moisture content, based on the modified Proctor test.
Question 3. [Week 4] Part a: The flow net is incorrect, as shown in figure below. Explain why.
Part b: 1. Calculate water pressure ( u ) at A and B. 2. Given a 20m length of sheet pile perpendicular to the section and k ? 5?10?3 cm sec , Calculate the total flow (Q) per day. 4.2m 16m A B