Saturated silty clay encountered in a deep excavation is found to have a water content of 28%. Determine unit weight of the clay in kN/m3. Assume Gs=2.7
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5. Saturated silty clay encountered in a deep excavation is found to have a water content of 28%. Determine unit weight of the clay in kN/m3. Assume Gs=2.7
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- For a normally consolidated soil, the following is given: Determine the following: a. The compression index, Cc. b. The void ratio corresponding to pressure of 200 kN/m28. An exploratory drill hole was made in a saturated stiff clay having a water content of 32%. It was observed that the sand layer underlying the clay was under artesian pressure water in the drill hole rose to a height of 4 m. above the top of the sand layer. If an open excavation is to be made in the clay. (See picture below) Determine the void ratio of clay. (Answer: 0.864) Determine the saturated unit weight of clay. (Answer: 18.76 kN/m3) How deep can the excavation proceed before the bottom of the saturated clay heaves or when its effective stress is zero. (Answer: 5.91 m)5. A clay layer having a thickness of 10.83 m. has an initial void ratio of 1.14. It is compressed and the void ratio changed to 0.81. Determine the reduction in thickness, in mm., of the clay layer. Round off to three decimal places. Input the numerical value only.
- three samples of loose sand were tested under consolidated undrained conditions. test results are given below undrained angle of friction = 35 deviator stress = 260 kPa pore water pressure = 30 kpa a. determine the undrained confining pressure in kPa. round off to three decimal places b.determine the drained angle of friction in degress. round off to three decimal places c. determine the drained angle of inclination of failure plane in degrees.7.14 For a normally consolidated clay, the following values are given: Void ratio, e k (cm/sec) 0.95 0.2 x 10-6 0.91 x 10-6 1.6 Estimate k at a void ratio of 1.1. Use Eq. (7.38). Ⓒ Cengage Learning 2014A hand-carved sample of soft saturated clay has a volume of 100 cu.cm and weighs 175 grams. If the oven-dry weight is found to be 120 grams; 1. Calculate the water content of the soil. A. 45.80% B. 42.64% C. 29.57% D. 36.40% 2. Solve the void ratio. A. 1.80 B 1.22 C. 0.84 D. 0.52 E. None of the side
- A sample of saturated clay, taken from a depth of 5 m, was tested in a conventional oedometer. The table below gives the vertical effective stress and the corresponding thickness recorded during the test. The water content at the end of the test was 40% and the initial height was 20 mm.(a) Plot a graph of void ratio versus ??′(log scale).(b) Determine ?? and ??.(c) Determine ?? between ??′ = 400 kPa and ??′ = 500 kPa. (d) Determine ???′ using Casagrande’s method.The following are the results of a consolidation test on a sample of a clayey soil. • Plot the e-log o curve. • Determine the pre-consolidation pressure. • Calculate the compression index, Ce and the ratio of C; /Ce. Pressure, o' (kN/m?) 1.113 25 1.106 50 1.066 100 0.982 200 0.855 400 0.735 800 0.63 1600 0.66 800 0.675 400 0.685 200Q1) Triaxial un drained tests were performed on clay samples taken from stratum shown below (point A), . 1) Find the both of shear strength and shear stress acting on the inclined plane of 0 = 57° for this sample , (K,= 0.5) , 2) If this point is exerted to surface load and the increment stress due to this load (A= 100 kpa) , How much does become the shear stress (t ) that exerted on the this plane (0=57) 4 m v WT Ya = 18 kN/m³ 13m sand gravel Gs=2.6, e=0.43 3.5 m 0 caly.c = 20 kN/m²,0 24° Ysar=17 KN/ m3 7m
- In a drained triaxial test on consolidated clay the stress and angle are as follows: Deviator stress is 20 1b/in2 and friction angle is 210 . Calculate the effective confining pressure at failure.? A) 21 1b/in2 B) 22.2 1b/in2 C) 25.4 1b/in2 D) 17.9 1b/in2 make it fast11.12 A 2-m clay layer in the field has a current effective stress, oó= 70 kN/m?. There is a net stress increase, Ao = 180 kN/m², due to a foundation load. Calculate the expected primary consolidation settlement. The results of a consolidation test on the clay are given below. o' (kN/m) 0.98 12 0.94 50 0.82 200 0.73 400 ©Cngage lamng 2014Saturated clay encountered in a deep excavation is found to have a water content of 28%. Determine the unit weight of the clay in kN/m3. Assume sg=2.7