Principles of Geotechnical Engineering (MindTap Course List)
Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
Question
Chapter 16, Problem 16.17P
To determine

Find the gross allowable load that the footing could carry using the effective area concept.

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It is required to design a cantilever retaining wall to retain a 5.0 m high sandy backfill. The dimensions of the cantilever wall are shown in Figure 15.52 along with the soil properties. Check the stability with respect to sliding and overturning, based on the active earth pressures determined, usinga. Coulomb's earth pressure theory (δ' = 24°), andb. Rankine's earth pressure theory.The unit weight of concrete is 24 .0 kN/m3
A 6m high vertical retaining wall is used to retain a soil of unit weight 18 kN/m3 and slope 20°. The soil is a cohesionless soil with internal friction angle of 40°. Compute the coefficient of active earth pressure from the given data.
For a railway track 7 m high embankment is required. The clay to be used for the embankment was found to have c = 20 kN/m2and unit weight = 19 kN/m3 Compute the critical maximum side slope angle for the embankment if a hard rocky stratum was found 3.5 m below the ground level. Assume ϕ for the clay equal to zero. The following values are given from Taylor's chart for depth factor D = 1.5 :
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  • A 2 m 3 m spread footing placed at a depth of 2 m carries a vertical load of 3000 kN and a moment of 300 kN m, as shown in Figure P6.14. Determine the factor of safety using Meyerhofs effective area method. Figure P6.14
    The excavation 3 × 6 m for a foundation is to be made to a depth of 2.5 m below ground level in a soil of bulkunit weight = 20 kN/m3.What effect this excavation will have on the vertical pressure at a depth of 6 m measuredfrom the ground surface vertically below the centre of foundation? The influence factor for m = 0.43 and n = 0.86 is 0.10.
    Note: Need detailed answer and explanation for d-h. [Question 1] A vertical retaining wall (with base slab to be determined in later questions) of 5.4 meter height supports a horizontal backfill of a normally consolidated sand with unit weight equal to 17.3 kN/m3. Assuming friction angle is 36 degrees and cohesion of soil is zero, a. Compute for the At Rest force per unit Length (in kN/m, i.e., assuning 1 meter width of analysis) rounded in 2 decimal digits. (Answer: 103.41) b. Compute for the Rankine Active force per unit Length (in kN/m, i.e., assuning 1 meter width of analysis) rounded in 2 decimal digits. (Answer: 63.05) c. Compute for the Rankine Passive force per unit Length (in kN/m, i.e., assuning 1 meter width of analysis) rounded in 2 decimal digits. (Answer: 971.1) d. Estimate a constant dimension, d (from bottom to top of the stem) of the above given problem for the Rankine Active Pressure. Assume cover of 50mm. Express answer in millimeter (mm) rounded to the nearest…
  • A retaining wall 6 m high supports cohesionless soil having a dry density of 1600 kg/m³, angle of resistance 32 and void ratio of 0.68. The surface of the soil is horizontal and level with the top of the wall. Neglecting wall friction and using Rankine’s formula for active pressure of a cohesionless soil. 1. Determine the nearest value of the total earth thrust on the wall in KN per lineal meter if the soil is dry.  a. 73.1 b. 86.7 c. 62.4 d. 98.1 2. Find the nearest value of the thrust on the wall in KN per lineal meter if owing to inadequate drainage, it is waterlogged to a level of 3.5 m below the surface. a. 112 b. 171 c. 147 d. 153 3. Find at what height above the base of the wall the thrust acts during the waterlogged condition. a. 2.21 m b. 2.00 m c. 1.74 m d. 1.42 m
    Make an estimate of lateral earth pressure coefficient on a basement wallsupports soil to a depth of 2 m. Unit weight and angle of shearingresistance of retained soil are 16 kN/m3 and 32° respectively.
    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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