Principles of Foundation Engineering (MindTap Course List)
8th Edition
ISBN: 9781305081550
Author: Braja M. Das
Publisher: Cengage Learning
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Textbook Question
Chapter 8, Problem 8.8P
From the plate load test (plate dimensions 1 ft × 1 ft) in the field, the coefficient of subgrade reaction of a sandy soil is determined to be 60 lb/in3. What will be the value of the coefficient of subgrade reaction on the same soil for a foundation with dimensions of 20 ft × 20 ft?
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Question 01.
Using the Fadum chart provided, calculate the total vertical stress due to 200 kPa uniform contact pressure at a depth of 6m below point A for the rectangular raft foundation as per Question 1 part of the attached image.
L1 = 7m
L2 = 3m
B1 = 9m
B2 = 4m
Question 02.
A section of the proposed foundation in Question 01 has an obstruction. A redesign is carried out as shown in Question 2 part of the attached image. The original proposed footprint was maintained, and the section removed from the design has a width of B3 = 2mCalculate the total vertical stress at the same depth below A and the same uniform pressure in Question 01.
Refer to Figure 5,determine th eaverage stress increase in the clay layer below the center of the foundation due to the net foundation load of 490,500kN (net load). Using Eq.(7.25)
Question 3:
For the same foundation as Problem 2, find the change in stress at a depth of 10 meters at location B in the figure. The mat foundation will support 10,800 kN evenly distributed across the area.
Answer Question 3
Chapter 8 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 8 - Prob. 8.1PCh. 8 - Following are the results of a standard...Ch. 8 - Repeat Problem 8.2 for an allowable settlement of...Ch. 8 - Prob. 8.6PCh. 8 - Prob. 8.7PCh. 8 - From the plate load test (plate dimensions 1 ft ×...Ch. 8 - Refer to Problem 8.8. If the full-sized foundation...Ch. 8 - The subgrade reaction of a sandy soil obtained...
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- The subgrade reaction of a sandy soil obtained from the plate load test (plate dimensions 1 m × 0.7 m) is 18 MN/m3. What will be the value of k on the same soil for a foundation measuring 5 m × 3.5 m?arrow_forwardRefer to Problem 8.8. If the full-sized foundation had dimensions of 70 ft × 30 ft, what will be the value of the coefficient of subgrade reaction? 8.8 From the plate load test (plate dimensions 1 ft × 1 ft) in the field, the coefficient of subgrade reaction of a sandy soil is determined to be 60 lb/in3. What will be the value of the coefficient of subgrade reaction on the same soil for a foundation with dimensions of 20 ft × 20 ft?arrow_forwardA plate loading test was carried out on a medium dense sand, using a 1 ft wide square plate, and k1 was determined as 350 lb/in3. Determine the coefficient of subgrade reaction for a 7.5 ft wide square foundation and a 7.5 ft × 10.5 ft rectangular foundation.arrow_forward
- A 300 mm 450 mm plate was used in carrying out a plate loading test in a sand, during which the plate settled 5 mm under the applied pressure of 250 kN/m2. a. What is the coefficient of subgrade reaction for a 300 mm wide square plate? b. What would be the coefficient of subgrade reaction of a 2 m 3 m foundation?arrow_forwardA load of 337 kips is imposed on a foundation 10 ft square at a shallow depth in a soilmass. Determine the vertical stress at a point 16 ft below the center of the foundation(a) assuming the load is uniformly distributed over the foundation, and (b) assuming the load acts as a point load at the center of the foundation.arrow_forwardA foundation 15 ft x 20 ft is proposed near an existing one, 10 ft x 15 ft as shown in the figure below. Determine the following: (A) The vertical total stress increase at A, B, and C at a depth of 4 ft below the ground surface of the existing foundation before construction of the proposed foundation.(B) The vertical total stress increase at A, B, and C at a depth of 4 ft below the ground surface of the existing foundation from the construction of the proposed foundation.arrow_forward
- A flexible foundation is 2 m x 4 m rests on granular soil at ground level. It carries a uniformly distributed load of 160 kN/m2. The sand has an elastic modulus of 39 MPa , a Poisson's Ratio of 0.3 and is 5 m thick. Estimate the elastic settlement below the center of the loaded foundation. Give your answer in cm rounded to 2 decimal places.arrow_forwardProblem 1. A rectangular foundation 4m x 6m transmits a stress of 100 kPa on the surface of a soil deposit. Plot the distribution of increases of vertical stresses with depth under points A, B, and C up to a depth of 20m. At what depth is the increase in vertical stress below A less than 10% of the surface stress?arrow_forwardFor a normally consolidated clay layer, given:Thickness = 3.7 mVoid ratio = 0.82Liquid limit = 42Average effective stress on the clay layer 5 110 kN/m2 How much consolidation settlement would the clay undergo if the average effective stress on the clay layer is increased to 155 kN/m2 as the result of the construction of a foundation?arrow_forward
- In conducting triaxial test to determine shear strengths for soil samples, what consolidation pressures should be specified?arrow_forwardSubject : Geotechnical Engineering Df=5ft, B=2ft, H=10ft, and Es=5000 psi, q=200 psf Determine the elastic settlement of a square foundation on saturated clay layer.arrow_forwardEstimate the ultimate consolidation settlement under the centerline of a 25 x 25 meter mat foundation. The mat is 1.5 meter thick reinforced concrete (ϒconcrete = 23.6 kN / m3), and the average stress on the surface of the slab is 125 kPa. The soil profile is shown in the figure below. Lab testing on samples of the clay showed that the clay is normally consolidated and that Cc = 0.40, Cr = 0.03, and eo = 1.13. Neglect any settlements due to the sand layer. Divide the clay layer into four thinner layers of thickness 2.0, 2.0, 3.0, and 3.0 meters.arrow_forward
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