Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 12, Problem 12.13P
To determine
Find the soil encountered at a depth of 32 m.
Find the relative density of the soil.
Find the friction angle of the soil.
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Q4- Results shown in table below were obtained from an Odometer test on specimen of saturated
clay. A layer of this clay 1.9 m thick lies below a 2.0 m depth of sand, the water table being at the
surface. The saturated unit weight of both soils is 18.8 kN/m³. A 2.5 m depth of fill ( 4 x 6 m in
size) has a unit weight of 20.8 kN/m’ is placed on the sand surface. Determine the final settlement
due to consolidation of clay.
Pressure, kN/m² 25
50
100
200
400
200
100
50
Void ratio
1.239 | 1.212
1.136
1.059
0.988
1.00
1.010
1.221
Show solution. The answer must be 27.2 and 17.74
A soil profile is shown in Figure P3.2 along with the standard penetration numbers in the clay layer. Use Eqs. (3.8) and (3.9) to determine the variation of cu and OCR with depth. What is the average value of cu and OCR?
Chapter 12 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- A cylindrical sample of soil having a cohesion of 80 kN/m2 and an angle of internal friction of 20° is subjected to a cell pressure of 100 kN/m2. Determine the angle made by the failure plane with the axis of the sample.arrow_forwardThe soil sample in a tri axial test have the following stresses Cell pressure 25 Кра 34 Кра Pore stress Deviator stress 20 Кра 31 Кра 12 Кра 10 Кра a) Calculate the drained angle of internal friction b) Find the cohesion of soil c) What is the angle of failure in shear?arrow_forwardConsolidated drained triaxial tests on two specimens of a soil gave the following results: Determine the values of c and ? for the soil. Test no. Confining pressure 03 (kN/m²) Deviator stress at failure Aof (kN/m²) 1 70 440.4 2 92 474.7arrow_forward
- 1. A Sample of Clay is isotropically normally consolidated to a cell pressure of 350kPa. The sample was then sheared (standard) in a drained state. Calculate values of q, p', and v at failure if the soil constants were: M=0.88, N=2.88, T=2.76, and λ=0.16arrow_forwardQuestion Attachedarrow_forwardGeotechnical Engineering The following are the results of a standard penetration test in sand. Estimate the soil friction angle at the 3.0 meter depths given N60 =7 . Note that the water table was not observed within a depth of 12 m below the ground surface. Assume that the average unit weight of sand is 15.5 kN/m3 and Pa = 100 kN/m2. a. 44.6 b. 37.6 c. 38.9 d. 34.4arrow_forward
- A soil sample has a maximum void ratio of 0.95 and minimum void ratio of 0.55. It was also found out that the porosity is 25%, moisture content is 16% and Gs = 2.65. Compute the dry unit weight of the sample.a. 16.45 kN/m^3b. 17.53 kN/m^3c. 19.50 kN/m^3d. 20.02 kN/m^3arrow_forwardA compacted earth fill is constructed on a soft, saturated clay (figure below). The fill was compacted to an average dry unit weight of 19 kN/m³ and water content of 15%. The shearing strength of the fill was determined by CU tests on samples compacted to representative field conditions. The shear strength parameters are su = 45 kPa, Þ, = 34°, and es = 28°. The variation of undrained shear strength of the soft clay with depth as determined by simple shear tests is shown in the figure below, and the friction angle at the critical state is pes = 30°. The average water content of the soft clay is 40%. Compute the factor of safety using Bishop's simplified method. Assume that a tension crack will develop in the fill. 8 m 10 m 3 6 m Clay crust Su (kPa) 7.5 15 Compacted fill + 1 m E 1.0 2.5 4 m Soft clay 5.0 Very dense sand 10 kPa [Budhu M. Soil Mechanics & Foundations (3E), p. 720] Page I of 2 Note the following: · Produce a step-by-step solution and clearly outline your approach. · Use…arrow_forwardSubject: Soil Mechanics Please provide a solution and a diagram. A cylindrical sample of soil having a cohesion of 80 kN/m2 and an angle of internal friction of 20°is subjected to a cell pressure of 100 kN/m2. Determine the maximum deviator stress at which the sample will fail in kPa. a. 333 b. 387 c. 255 d. 246arrow_forward
- Cone penetrometer soundings were used for the subsurface investigation of a planned construction site. At one sounding location, the value recorded for qc at a depth of 8 m was 8,000 kPa. The soil has a unit weight of 16 kN/m3. Using criteria that relate CPTresults and the soil angle of internal friction, estimate the value of f for the sand at the test depth.arrow_forwardFollowing is the variation of the field standard penetration number in a sand deposit: The groundwater table is located at a depth of 6 . Given: the dry unit weight of sand from 0 to a depth of 6 is 16 , and the saturated unit weight of sand for depth 6 to 12 is 22.2 . Estimate an average peak soil friction angle. Use the equation (Enter your answer to three significant figures.)arrow_forward2- Subsurface geotechnical investigations carried out in a deposit of sand provided the field standard penetration numbers N60 as given in the table below. During the geotechnical investigations, it is also observed that underground water table is encountered at a depth of 2.0 m below the ground surface. Laboratory tests have shown that physical properties of deposit of sand are as: Dry unit weight = 17.6 kN/m³ and saturated unit weight = 19.6 kN/m³. Determine, for an earthquake magnitude of 8.25, if liquefaction will occur at the site. Assume that maximum peak ground acceleration at the site is: amax = 0.25g. (6 points) DEPTH (M) N60 (BLOWS/30CM) 3 5 6 7 9 11 12 14 18 21 Note: the gravitational acceleration could be taken as 9.81 m/s².arrow_forward
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