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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1. A 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.
Oft
Sand
Ymoist = 120 pcf
Phi = 30deg
Es = 52 ksf
4ft
Loose Sand
5ft
Ymoist = 125 pcf
Yat = 145 pcf
Phi = 22deg
Es (above GW) = 30 ksf
Es (below GW) = 20 ksf
8ft
Dense Sand
Ysat = 155 pcf
Phi = 35deg
Es = 60 ksf
20ft
2. The foundation above is limited to a 1.5" settlement after 10 years, speak to whether the
design is adequate and if not how can you adjust the project to meet this criteria.
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:
only HANDWRITTEN answer needed ( NOT TYPED)
Chapter 8 Solutions
Foundation Design: Principles and Practices (3rd Edition)
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- resolve problem: Redo problem (5.3) but with sand instead of clay as shown in the figure below.(Ans.: Si(Total) = 5.75 mm) "please resolve the problem 5.3 but sand instead of clay"arrow_forward(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_forwardSubject: Geotechnical engineering Please give me right solution according to the question.. urgentarrow_forward
- Problem (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_forwardDetermine 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_forwardplz write hand step by steparrow_forward
- Rectangular 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_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_forwardO Bearing Capacity Supplemental O File | C:/Users/CABALAG/Downloads/Bearing%20Capacity%20Supplemental%20Materials%2001242022.pdf 1. This example explores a column footing in a homogeneous clay layer. Find the ultimate bearing capacity, allowable bearing capacity and allowable load of a 1.2 m x 1.2 m square footing placed in a clay layer. The density of the soil is found to be 17.7 kN/m³ and the cohesion was found to be 20 kPa. Clay d= 1.2m y = 17.7kN/m³ c= 20 kPa = 0° factor of safety (F.o.S.) = 3.0 5:42 PM 30°C Mostly sunny ^ O G 4) D ENG 1/28/2022arrow_forward
- The 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_forwardPrepare 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_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
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