Foundation Design: Principles and Practices (3rd Edition)
3rd Edition
ISBN: 9780133411898
Author: Donald P. Coduto, William A. Kitch, Man-chu Ronald Yeung
Publisher: PEARSON
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Chapter 8, Problem 8.3QPP
Repeat problem 8.2 using Schmertmann’s method, compute the settlement of this footing at
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2. Change the footing dimension in the question below to a strip
footing with width of 6 ft. and find the settlement using
Schmertmann's modified method to calculate the required
settlement.
Example 8-2: A 6 ft x 24 ft footing is founded at a depth of 3 ft below ground elevation with
the soil profile and average N160 values shown. Determine the settlement in
inches (a) at the end of construction and (b) 1 year after construction. There is
no groundwater. The footing is subjected to an applied stress of 2,000 psf.
Ground Surface
Clayey Silt
3 ft
Y = 115 pcf; N160= 8
Sandy Silt
B = 6 ft
3 ft
Y = 125 pcf; N160= 25
Coarse Sand
5 ft
Yt = 120 pcf; N160= 30
Sandy Gravel
25 ft Yt = 128 pcf; N160= 68
example: (Total immediate settlement),
Determine the total immediate settlement of the rectangular footing shown in figure belowe after 2 months.
Two footings, one circular and the other strip, are founded on the surface of a purely
Cohesionless soil. Diameter of the circular footing and width of strip footing is same. Then, the
ratio of ultimate bearing capacity of circular to strip footing is:
Chapter 8 Solutions
Foundation Design: Principles and Practices (3rd Edition)
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- (a) Design (determine only B and L) a rectangular footing for the conditions in the figure below and using the assigned data given in the table Section B- quatali/unit length Property line B Plan Figure 1. Concept of a rectangular combined footing Load Load Spacing Location of the Allowable soil fe fy (Q.) (Q2) (L,) Property Line (L2) pressure (qau) 480 kN 570 kN 4.5 m 1.5 m 21 MPa 400 MPa 175 kPa (b) Estimate the total consolidation settlement after the 5 years after the completion of the primary consolidation settlement of the foundation (from (a), q = 175 kPa) considering the three-dimensional effect provided that A = 0.6. (Note: Time for completion of primary consolidation settlement is 1.5 years. You do not need to 3D effect for the secondary compression, Ca = 0.01)arrow_forwardProblem (2.8):The load-settlement data obtained from load test of a square plate of size (1ft) are as shown below. If a square footing of size (7t) settles (0.75 inch), what is the allowable soil pressure of the footing? Consider sandy soil. Load (Tsf) Settlement (inch) 10 0.4 14 0.6 16 0.8 19 1.0 0.1 0.2 0.3arrow_forwardA 4ft by 4ft spread footing is proposed where the bottom of footing is set 2ft below grade. The column bearing on this footing will impose a load of 180kips. Assuming the subsurface conditions shown below with groundwater 5ft below grade, Use Schmertman’s method to calculate the elastic settlement of the system 6 years after construction is completed, provide a clear sketch and show units and state assumptions.arrow_forward
- Determine the elastic settlement using the Schmertmann method of the 10'x 10' footing as shown below. Estimate the elastic modulus using Es = 10(N + 15), where Es is in ksf and N is the corrected SPT value. Loose sand Medium dense sand Loose sand Dense sand Very loose sand DEPTH 5° 10' 15' 20' 25' SPT 10 21 11 15 41 4 Q=250 kips 10' x 10' 0 0.2 0.4 0.6 STRAIN & Layer 1 Layer 2 Layer 3 Layer 4 Laver 5arrow_forwardThe width and depth of a footing are 2 and 1.5 m respectively. The water table at the site is at a depth of 3 m below the ground level. The water table correction factor for the calculation of the bearing capacity of soil isarrow_forwardRectangular footing (4m x 5m) was supported by a saturated clay layer with a thickness of 5m. If the second layer (below the clay) was a saturated sand. The settlement that could be occurred in this site: a. Is only consolidation settlement b. None of the given answers are correct c. Is a short term settlement d. Is only long term settlementarrow_forward
- Prepare a spreadsheet to compute settlement of square footings using the e@log@p method. Thespreadsheet should allow input of: footing width, footing depth, groundwater depth, columnservice load, footing rigidity factor and Cr/(1 + e0), Cr/(1 + e0), sm′, and g as function ofdepth. Check your spreadsheet using a hand solutionarrow_forwardRefer to the rectangular combined footing in Figure 10.1, with Q1 = 100 kip and Q2 = 150 kip. The distance between the two column loads L3 = 13.5 ft. The proximity of the property line at the left edge requires that L2 = 3.0 ft. The net allowable soil pressure is 2500 lb/ft2. Determine the breadth and length of a rectangular combined footing.arrow_forwardA rectangular footing, with a plan area of 1-4mx2·0m is to be placed 2m below the ground surface. The footing would be subjected to a load inclined at 10° to the vertical. The subsoil is clayey, sandy silt with saturated unit weight of 18 kN /m3, and c' = 10kN/m2 and cp' = 30°. Assuming the rate of loading is such that drained condition prevailed, compute the magnitude of load carrying capacity of the footing if. the water table is at the base of the footing. Use IS: 6403-1981 recommendation and assume factor of safety= 3·0.arrow_forward
- 15 - The undrained strength of a saturated clay sample is 27 KPa If a square footing of size 4 m x 4 m is resting on the surface of a deposit of the above clay, the ultimate bearing capacity of the footing (as per Terzaghi's equation) is a) O 108 kPa b) 315 kPa 200 kPa d) 54 kPa Boş bırakarrow_forwardA square footing having the dimension of 24 x24 (B=L=24) is to beconstructed on a deep clay deposit. Superstructural stress is calculated as 150 kPa. Thefoundation will rest at the depth of 2 m from the surface. The groundwater table is located onthe surface and the saturated unit weight of the clay is 17 kN/m3. Determine the depth of theborehole considering both de Beer’s rule and the Turkish Earthquake Code (2018).arrow_forward10. Calculate the ultimate bearing capacity considering the following:A. A strip footing, 2 meters wide.B. A square footing 3 m by 3 mC. A circular footing 3 m in diameter. All footings are located at the ground surface and groundwater level is at the ground surface. The soil is coarse-grained with saturated unit weight of 19.8 kN/m3 and angle of internal friction of 25°arrow_forward
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