Suggest suitable foundation system for three different soil and site conditions as follows: a) Uniform firm and stiff clays where existing nearby vegetation is insignificant. b) Site with groundwater table problem c) Filled site

Suggest suitable foundation system for three different soil and site conditions as follows: a) Uniform firm and stiff clays where existing nearby vegetation is insignificant. b) Site with groundwater table problem c) Filled site

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter10: Mat Foundations

Section: Chapter Questions

Problem 10.1P: Refer to the rectangular combined footing in Figure 10.1, with Q1 = 100 kip and Q2 = 150 kip. The...

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Suggest suitable foundation system for three different soil and site conditions as follows:
a) Uniform firm and stiff clays where existing nearby vegetation is insignificant.
b) Site with groundwater table problem
c) Filled site

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what is the suitable foundation system for three different soil and site conditions as follows:a) Uniform firm and stiff clays where existing nearby vegetation is insignificant.b) Site with groundwater table problemc) Filled site
Question 1 Suggest suitable foundation system for three different soil and site conditions as follows: a) Uniform firm and stiff clays where existing nearby vegetation is insignificant. b) Site with groundwater table problem c) Filled site Question 2 Different type of soil and/or site conditions call for different factors affecting the selection of foundation system. Based on site and soil condition given in Question 1, discuss at least three factors that need to be considered during selection of the suitable foundation system.
A long strip footing 3.5 ft wide is to be used to support a masonry bearing wall for a building. The subsurface investigation indicates that the soil at the site is a clay with a unit weight of 110 pcf and a cohesion, c, of 1,200 psf. The angle of internal friction is zero. The clay has a rigidity index of 10. The foundation is constructed 3 ft below the ground surface, and the soil backfill is well compacted. Using a factor of safety of 3, what maximum load should the foundation be designed to support per foot of wall length?
A (4m x 5m) rectangular footing was supported bya 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. None of the given answers are correct b. Is only long term settlement C. Is a short term settlement O d. Is only consolidation settlement
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. What is the maximum bending moment from the earthquake that this foundation can support? Consider bending moment only about one axis.
4. A subsurface exploration is conducted and it is discovered that the subsurface soils are primarily stiff sandy clays. Given the spacing of some of the columns it is decided that strip footings would best support them. The proposed footing configuration is shown below. Detemine the ultimate loads that can be supported by the footing shown if it is founded at a depth of 3.5 feet below the ground surface. The groundwater was found to be at a depth of 10 ft below the ground surface. Assume the rectangular foundation is rigid and that the loads from both columns are uniformly supported by the footing. Use a factor of safety of 4. 15 ft 2.5 ft 2.5 ft 5 ft 10 ft PLAN Qult Qult ELEVATION 3.5 ft 14 in C = 300 lb/ft? 10 ft y = 118.6 lb/ft³ Ø = 15° c = 300 lb/ft² Ysat = 126.6 lb/ft³ Ø = 15°
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.
Define Shear Strength of Saturated Cohesionless Soils
A square footing 5 ft by 5 ft supported on a sandy stratum is designed to carry a column loading of 250,000 lb. The unit weight of the sands underlying the footing location vary between 120 and 125 pcf. Estimate the foundation settlement to be expected using the subgrade reaction method. (Neglect the weight of the footing.)
A 7 foot-square footing is embedded 3 feet below the ground surface and is supported on a clayey sand fill having a total unit weight of 130 pcf. Groundwater is at 8 feet below the ground surface. Consolidated undrained triaxial tests with porewater pressure measurements on three "identical" samples suggest the fill has a drained friction angle of 29 degrees and drained cohesion of 50 psf. What is the allowable bearing capacity for this footing for a factor of safety of 3 AND what is the maximum allowable column load the footing can safely support based on this factor of safety?
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