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 17, Problem 17.15P
A shallow square foundation for a column is to be constructed. It must carry a net vertical load of 1000 kN. The soil supporting the foundation is sand. The standard penetration numbers (N60) obtained from field exploration are as follows:
FIG. 17.15
The groundwater table is located at a depth of 12 m. The unit weight of soil above the water table is 15.7 kN/m3, and the saturated unit weight of soil below the water table is 18.8 kN/m3. Assume that the depth of the foundation will be 1.5 m and the tolerable settlement is 25 mm. Determine the size of the foundation.
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Chapter 17 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- The table gives the standard penetration numbers determined from a sandy soil deposit in the field: Using Eq. (12.19), determine the variation of the peak soil friction angle, . Estimate an average value of for the design of a shallow foundation. Note: For depth greater than 6 m, the unit weight of soil is 18.55 kN/m3.arrow_forwardA 16-m thick soil has water table 4 m. below the ground surface. The soil has a void ratio of 0.42 and specific gravity of 2.62. Above the water table, the soil has a degree of saturation equal to 49.96%. Direct shear test conducted on the soil shows that the an angle of internal friction of 24.25° and cohesion of 15.13 kPa. What is the potential shear strength (in kPa) on a horizontal plane at a depth of 8 m. below the ground surface? Round off to two decimal places.arrow_forwardA 17-m thick soil has water table 4 m. below the ground surface. The soil has a void ratio of 0.48 and specific gravity of 2.68. Above the water table, the soil has a degree of saturation equal to 45.9%. Direct shear test conducted on the soil shows that the an angle of internal friction of 21.01° and cohesion of 15.03 kPa. What is the potential shear strength (in kPa) on a horizontal plane at a depth of 9 m. below the ground surface? Answer: 65.95arrow_forward
- 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=2.7arrow_forwardA vertical cut in a clay collapsed when the depth of excavation reached 4.5 m. Calculate the clay cohesion c if avertical cutting in this clay, 8 m deep, is supported by a retaining wall. Also calculate the earth pressure force acting on the wallarrow_forwardDetermine the internal friction angle of a cohesionless soil that has been tested under a normal stress of 200 kN/m2 and and fails at shear stress of 100 kN/m2.arrow_forward
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