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 8.2QPP
A 250-k column load is to be supported on a 9 ft square footing embedded 2 ft below the ground surface. The underlying soil is a silty sand with an average
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Figure (a) shows the cross section of square footing of 3 m x 3 m. The soil
properties are shown in the figure.
i)
ii)
Determine the load Q that the footing can carry. Use the factor of safety (FOS)
of 2.5.
During rainy season, groundwater level increased to the soil surface. Based on
this condition, calculate the new FOS and justify whether the existing footing is
able to carry the same amount of load as calculated in (a)
Not drawn to scale
1.6 m
0.4 m
Water level
3m
Q
Soil properties
Yd=18.3K³
Ysat = 21 kN/m³
= 30°
Following are the results obtained from a plate load test performed on a square plate of
30 cm x 30 cm size at a depth of 1.5 m below as, in a homogeneous sand bed. Determine ultimate
load which a footing of size 2 mx 2 m placed at 1.5 m below G.L. of the same soil, if allowable
settlement is 15 mm.
Settlement, mm
0
10
20
30
40
50
60
50
100
Load, kN/m²
150
200
250 300
350
400
Chapter 8 Solutions
Foundation Design: Principles and Practices (3rd Edition)
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- A 2.0 m 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a column load Q. The depth of the footing is 1.0 m. The soil parameters are: c = 0, = 26, = 19 kN/m3, and cu = 60 kN/m2. Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.arrow_forwardA 2.0 m 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a column load Q. The depth of the footing is 1.0 m. The soil parameters are: c = 0, =26, = 19 kN/m3, cu = 60 kN/m2 (=0 condition). Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.arrow_forwardA plate-load test was conducted on-site in Cavite in which the soil was found to be clay. PLT was conducted using a circular plate having a diameter of 557 mm. The ultimate load for the test was found to be 554 kN/m2. What should be the maximum allowable load of a footing having a diameter of 2.25 m? Use an FS of 3.98.arrow_forward
- A 3 ft square footing carries a sustained load of 10 k. It is placed on the surface of a 30 ft thicksaturated overconsolidated clay underlain by dense sand. Based on laboratory tests, the clay can be adequately modeled using the e@log@p method. The laboratory tests provide the follow-ing compressibility information for the clay: g = 123 lb/ft3Cc1 + e0= 0.06Cr1 + e0= 0.002sm′ = 900 lb/ft2 The groundwater table is located at the ground surface. Compute the settlement of the footing.arrow_forwardA plate load test was carried out on a ground having a uniform sand stratum upto sufficient depth. The size of the plate used was 40 cm x 40 cm. Load (kN) 10 20 30 40 50 Settlement (mm) 2 3.5 5.5 7.5 10.5 Calculate load that can be taken by a column footing of size 3.5 m x 3.5 m in this soil, for an allowable settlement of 1.95 cmarrow_forwarda square footing is to be constructed on a uniform thick deposit of clay with a unconfined compressive strength of 3kips/ft2. the footing will be located 5 ft below the ground surface and is designed to carry a total load of 300 kips. the unit weight of the supporting soil is 128lb/ft3. no groundwater was encountered during soil exploration. considering general shear, determine the square footing dimension, using a factor of safety of 3arrow_forward
- A proposed office building will include a 10 ft x10 ft square, 3 ft deep (the footing height is also 3 feet) spread footing. The normally consolidated clay has the following engineering properties: Ydry = 115.0 pcf $'=24° c'=90.0 psf Cc/(1+eo) = 0.15 The soil stratum extends to a great depth, and the ground water table is 50 ft below the ground surface. Using the classical piece-wise log-linear method, estimate the total settlement of this footing considering only the allowable bearing pressures using ASD approach. The unit weight of concrete is 150 pcf. State any assumptions made.arrow_forwardQuestion 3. A strip footing is to be used in a clay soil in which the imposed load is 1 MN/m length. The clay layer is 7.0 m thick and overlies a stiff, fractured siltstone. The water table lies at a depth of 2.0 m. a. Determine the footing width based on the long-term allowable bearing capacity (calculated according to the method in the Canadian Foundation Engineering Manual; neglect depth factors) using a factor of safety of 3.0 for a burial depth of 2.0 m. The material properties of the clay are: c' = 15 E = 42 MPa o' = 27° y= 18.5 kN/m³ Ce = 0.40 e, = 0.90 C, = 9.3 x 104m²/day Cu = 25 b. Why would bearing capacity failure likely not govern the design of this structure?arrow_forward2- Determine the stress increase below the center of the footing using both theoretical and approximate methods at the top, middle and bottom of the clay layer. In addition, determine the average stress increase for the clay layer. Dimensions in Heights in m Unit weights in kN/m3 kN m P2 H1 H2 H3 BL Hw 2.5 Yoati 18.0 19.0 3.0 3.0 2.0 16.0 2 3 1174 Load - 0 Hw H1 H2 H3 OSand Clay (hoemally conactiduted)arrow_forward
- 2. A 10ft x 8ft foundation is set 4 feet below grade in the geotechnical setting provided in the above problem No 1, an applied load Q of 420kips is supported by this footing. Calculate the change of stress at 15ft and 30ft below grade at the center of the footing using: a. The 2:1 method b. m and n methodarrow_forwardA strip footing carries a load 14506 lbs per foot of length. The footing has a width of 2.3 ft. Determine the increase in vertical stress directly below the center of the footing at a depth of 0.8 ft. Provide your answer in psf, to 2 decimal place. Do not include units in your response.arrow_forward2. A building with a circular footing is constructed as the following figure. The design building load to the footing is 9650 kN. Find the distributed stress (Aoz) and final effective stress (o'vf) due to the circular footing at the following locations: at the intersection point of the footing center and a depth of 5.5 m. b. at the intersection point of the footing center and the mid-point of the clay layer? You are tasked to find out the depth of the mid-point of the clay layer. а. 5m Sand 4m Ysand = 18.5 kN/m³ %3D Clay Yclay = 15.8 kN/m3 %3D | 10m Sand Bedrock Center of footingarrow_forward
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