0.03, eo A 1.5-m square, 0.5-m deep footing carries a downward service load of 180 kN. It is underlain by an overconsolidated clay (OC case II) with the following engineering properties: C = 0.15, C, 18.0 kN/m³ above the groundwater table and 20.0 kN/m³ below. The groundwater table is at a depth of 6.0 m below the ground surface. The clay is 8 m thick from the base of footing. The pre-consolidation stress is 48 kPa. Determine the total settlement of this footing. = = 0.5, and y =

0.03, eo A 1.5-m square, 0.5-m deep footing carries a downward service load of 180 kN. It is underlain by an overconsolidated clay (OC case II) with the following engineering properties: C = 0.15, C, 18.0 kN/m³ above the groundwater table and 20.0 kN/m³ below. The groundwater table is at a depth of 6.0 m below the ground surface. The clay is 8 m thick from the base of footing. The pre-consolidation stress is 48 kPa. Determine the total settlement of this footing. = = 0.5, and y =

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter16: Shallow Foundations-bearing Capacity

Section: Chapter Questions

Problem 16.19CTP: A 2.0 m 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a...

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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.
A square footing which carries an axial load of 13000 kg has its bottom resting on a ground water table at a depth of 2.5 m from the ground surface. Nc = 35, Nq = 22, Nγ = 19. Take PDRY = 1910 kg/m3 and PSAT = 1600 kg/m3, c = 1800 kg/m2. Compute the net soil pressure.
A square footing of dimension 1.5m x 1.5m carries a load of 890 kN as shown in the image: Determine the following: (d) primary settlement for normally consolidated clay using exact equation for additional pressure at midpoint of clay. (e) primary settlement for normally consolidated clay using approximate equation for additional pressure at midpoint of clay.
A circular footing with a 1.52 m diameter is to be constructed 1.22 m below the groundsurface. Subsoil consists of a uniform deposit of dense soil having angle friction of 250 andcohesion c = 4.8 kN/m2 . Compute for the total allowable load the footing can carry, using a factor of safety of 3.0, ∂ = 20.12 kN/m3
(i) In a normally consolidated clay of L,L = 65.5% and 5 m thickness, the overburden pressure is increased from 250 kN/ by 120 kN/. Estimate the settlement that can take place. Assume saturated water content of 45% (ii) A square footing 2.8 m× 2.8 m is built on a homogeneous soil bed of sand of density 18kN/m3 and ϕ = 36o. If the depth of foundation is 1.8 m, determine the safe load can be applied on the footing. Take F. S. = 2.5, Nc = 27, Nq=36 and Nq=36 andNy= 35
A spread footing with a dimension of 2.0 m x 2.0 m is embedded in uniform clay at a depth of 1.0 m to support a vertical downward load of 300 kN. The pre-consolidation stress of the soil is 50 kPa and their compression indices are Cr/(1+e0) and Cc/(1+e0) of 0.025 and 0.11, respectively. The soil has unit weights of 16.8 and 17.8 kN/m3 above and below the groundwater table, respectively. The soil stratum extends to a great depth and the ground water table is at a depth of 1.5 m below the ground surface. Estimate the consolidation settlement of this footing. Use 2:1 method to estimate induced stress due to the applied load. The depth for settlement calculation is assumed to be 5 m below the foundation and use layer thickness of 1 m.
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, cu = 60 kN/m2 (=0 condition). Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.
An oil storage tank 35min diameter is located 2m below the surface of a deposit of clay 32mthick, which overliesa firm stratum, as shown in the scheme below. The net foundation pressures at the foundation level equal105 kN/m2. The average values of mv and pore pressure coefficient A for the clay are 0.14 m2/MN and 0.65,respectively. The undrained value of Young’s modulus is estimated to be 40 MN/m2. Determine the total settlement(excluding settlement due to secondary compression or creep) under the centre of the tank.
A soil formation is composed of 5m thick clay and 5m thick sand being sand above the clay. The groundwater table is located at 2m below the ground surface, assume E=6900kPa, If=0.79 and µ=0.2 a. A rigid column footing 1.2m in diameter is constructed. The load on the footings is 170kN. Determine the immediate settlement in mm. b. Calculate the primary compression index. c. Calculate the primary consolidation settlement of the normally consolidated clay layer if there is a surcharge of 40kpa acting on the ground surface. (neglect footings load) in mm.
A bed of sand 12 m thick is underlain by a compressible stratum of normally loaded clay, 6 m thick. The water table is at a depth of 5 m below the ground level. The bulk densities of sand above and below the water table are 17.5 kN/m3 and 20.5 kN/m3 respectively. The clay has a natural water content of 40% and LL of 45%. G = 2.75. Estimate the probable final settlement if the average increment in pressure due to a footing is 100 kN/m2. a.18.54 b.16.74 c.13.67 d.9.45
Design Miniproject2. A 1.0-m square, 0.5-m deep footing carries a downward load of 200 kN. It is underlain by an overconsolidated clay (OC case I) with the following engineering properties: Cc = 0.20, Cr = 0.05, e = 0.7, and  = 15 kN/m3 above the groundwater table and 16 kN/m3 below. The ground water table is at a depth of 1 m below the ground surface. a) Using the classical method, determine the total settlement of this footing. b) Design the required footing width to obtain a total settlement of no more than 25 mm. Select a width that is a multiple of 100 mm. Would it be practical to build such a footing considering the constraints?
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?