SITUATION: A rectangular footing, a=3m, b32m, has a thickness of 0.40m. If P-800KN is acting at d1=1.5m and d23D0.5m, Yconcrete =24 kN/m3, find the maximum soil pressure. di b a O Zoom image 357 57 343 150
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- A rectangular footing 3m x 2m exerts a pressure of 100kN/m2on a cohesive soil Es= 5x104 kN/m2and µ = 0.5. Estimate the immediatesettlement at the centre, assuming(a) the footing is flexible (b) the footing is rigid (ii) Write about influence of water table in determination of bearing capacity.A 3 m 4 m footing, founded at 2 m depth in a clay, applies a net pressure of 200 kN/m2. The bed rock lies 10 m below the footing. The modulus of elasticity of the clay is 30 MN/m2. Using Janbus generalized relationship [Eq. (17.1)], assuming undrained conditions and flexible footing carrying uniform pressure, estimate the expected settlement.3) A circular footing having a diameter of 1.2m has its bottom at a depth of 2.7m from the ground surface. Water table is located at a depth of 1.3m below the ground. Soil has the ff. properties. Dry unit weight = 18.1kn/cum Saturated unit weight = 19.3kn//cum C = 15.74kpa Angle of internal friction = 20deg %3D a) Assuming local shear failure, find ultimate bearing pressure using terzaghi's equation b) Det. Allowable bearing capacity using a factor of safety of 3. c) Find allowable load on footing.
- A circular footing with a 1.5 m diameter is to be constructed 1.22 m below the ground surface. The subsoil consists of a uniform deposit of dense soil having the following strength parameters: Angle of Friction = 250 Nc = 24.1 Nq = 13.1 Ny = 9.1 Cohesion = 48 kN/m2 Unit weight of soil = 20.12 kN/m2 The groundwater table is at a great depth and its effect can be ignored. Determine the following: a) Ultimate bearing Capacity of the soilCalculate the size of a square footing on a soil profile consisting of a medium-densesand layer with constant N values, N60 = 30. The dead load is 500 kN and the live load is200 kN. The footing is embedded 1 m into the sand. Groundwater is 2 m below thesurface. Consider that allwable settlement is 25 mm.The square footing shown in the figure carries a load of 3500 kN. Assume that the stress below the footing is distributed at a slope of 1H:2V. The clay layer is overconsolidated with OCR -2 Q - 3500 kN 4mx Sm 0.6 m Ya - 17.5 kN/m Sand 0.6 m GWT Sand 1.2 m 7'= 8.49 kN/m Yrat = 17.1 kN/m Clay e, = 1.4 C, = 0.06 = 0.38 1.2 m etermine the settlement of the clay layer.
- A circular footing with a 1.5 m diameter is to be constructed 1.22 mbelow the ground surface. The subsoil consists of a uniform depositof dense soil having the following strength parameters:Angle of Friction = 25o Nc = 24.1 Nq = 13.1 Ny = 9.1Cohesion = 48 kN/m2Unit weight of soil = 20.12 kN/m2The groundwater table is at a great depth and its effect can beignored.Determine the following:a) Ultimate bearing Capacity of the soilb) Compute the gross allowable bearing capacity of the soil using afactor of safety of 3.c) Compute the total allowable load that the footing can carry.A 1.8 m square, 2 m deep footing supports a service load of 570 kN. It is supported on a clayeysand. A dilatometer test run at the site has returned the following modulus profile.Depth (m) 2 3 4 5 6 7 8 9 10 11 12M (MPa) 7.7 8.8 10.2 14.8 15.4 10.8 11.6 11.6 13.1 13.8 13.4Compute the footing settlement.1- Given Data Column = 350 Kips = 250 Kips Footing = 3.25 ksi fy la = 60 ksi 40 in x 30 in = 2.7 ksf fy = 60 ksi = 3.25 ksi Find: suitable rectangular footing design for L/B = 1.6. There is no need to determine the development length. 1ksf = 47.5 kPa X= 40 in B Y%3D30 in
- 2. A 2m X 2m footing carrying 1400KN load is constructed in a site with 2.5m thick clay layer under a 2.5m thick sand layer. If the footing and the ground water table are located at 1.5m below the surface, calculate the consolidation settlement of the footing. You may assume the following soil properties: for sand sat 15.7kN/m°, and for clay eo= 0.65, Cc = 0.25, Cs = 0.06, O'p = 200kN/m² and sat =19.25KN/m³. 19.25kN/m and t = %3DFDE 006. The square footing shown carries a load of 3500 KN. Assume that the stress below the footing is distributed at a slope 1H:2V. The clay layer is overconsolidated with OCR=2. Q = 3500kN Vd 17.5kN/m'. Sand- Vsat 18.3kN/m³ Ysat 17.1kN/m² eo=1.4 Refer to FDE 006. Determi the settlement of the overconsolidated clay layer. Select the correct response: 101.819 mm 73.624 mm 37.561 mm 86.241 mm Clay 3m x 3m GWT Cs= 0.06 Cc = 0.38 0.6m 0.6m 1.2m 1.2mCalculate the settlement of the 10-ft-thick clay layer that will result from the load carried by a 5-ft-square footing. The clay is normally consolidated. Use the 2:1 method to calculate the average increase of effective pressure in the clay layer. 10 ft 10 ft 10 ft 5 ft ↓ Dry sand Footing size 5 ft x 5ft Sand Clay Ydry = 100 pcf Groundwater table Ysat = 120 pcf Ysat = 110 pcf % = 1.0 LL=40