Principles of Foundation Engineering
9th Edition
ISBN: 9780357684832
Author: Das
Publisher: Cengage Learning US
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Chapter 10, Problem 10.11P
To determine
Find the coefficient of subgrade reaction for a 2 m wide and 0.4 m thick beam using Equations (10.45) and (10.46)
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Problem 266
At 20°C, a rigid slab having a mass of 55MG is placed upon
two bronze rods and one steel rod as shown. At what
temperature will the stress in the steel rod be zero? For the
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um/(m C). For each bronze rod, A=6,000 mm?. E=83 x 10
N/m2, and a=19.0 um/(m°C).
M
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(b) Figure Q2 (b) shows the ring foundation to support a silo. Given R1 = 3 m while R2 =6 m. The total vertical load is 7500 kN.
(i) Calculate and plot the vertical stress increase with depth up to 7 m (use 1 minterval) under the centre of the ring (point O).(ii) Determine the maximum vertical stress increase and its location.
The plan of a foundation of uniform thickness for a building is shown in Figure 2. Determine the vertical stress increase at a depth of 10 m below the centroid. The foundation applies a vertical stress of 300 kPa on the soil surface.
Chapter 10 Solutions
Principles of Foundation Engineering
Ch. 10 - Refer to the rectangular combined footing in...Ch. 10 - Prob. 10.2PCh. 10 - Prob. 10.3PCh. 10 - Prob. 10.4PCh. 10 - Prob. 10.5PCh. 10 - Prob. 10.6PCh. 10 - Prob. 10.7PCh. 10 - Prob. 10.8PCh. 10 - A plate loading test was carried out on a medium...Ch. 10 - A 300 mm 450 mm plate was used in carrying out a...
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- In the figure, the rectangular foundation is loaded with a uniform load of 225 kPa. Accordingly, calculate the vertical stress increase 10 m below point A.arrow_forwardGiven the figure is the soil layer of a project site. The proposed building will exert a net stress of 12 Newtons per square cm. 4 m y=17.6 kN/m³ 11.2 m L'=10.4 kN/m³ w=40% LL=40% 8.2 m Xa=27.3 kN/m³ a) Determine the buoyant unit weight of the clay. [ Select ] b) Determine the vertical effective stress at the midheight of the clay layer. [ Select ] c) Determine the average settlement of the normally consolidated clay layer. [ Select ] Soft Clay Fine Sandarrow_forwardA rectangular concrete slab, 3mx4m, rests on the surface of a soil layer as shown in the figure. The saturated clay has over consolidation ratio of 2, w=38%, and Cr=0.05. Determine the primary consolidation settlement of the clay. The load on the foundation is 2000OKN. Assume that 20% of voids in sand is air and porosity of sand is 0.43. Cc=0.28 Gs=2.65 4 m Fine sand 5 m Clay 2 marrow_forward
- A vertical column load, P = 600 kN, is applied to a rigid square concrete foundation. The foundation rests at a depth Df= 0.75 m on a uniform dense sand with the following properties: average modulus of elasticity, Es = 20,600 kN/m², and Poisson's ratio, µs = 0.3. Calculate the required foundation dimensions if the allowable settlement under the center of the foundation is 25mm. 600 kN Foundation 0.75 m Вхв Soil Hs = 0.3 E, = 20, 600 kN/m² 5.0 m Rockarrow_forwardA rectangular concrete slab, 3 m X 4.5 m, rests on the surface of a soil mass. The load on the slab is 2025 kN. Determine the vertical stress increase at a depth of 3 m (a) under the center of the slab, point A (see Figure); (b) under point B (see Figure); and (c) at a distance of 1.5 m from a corner, point C (see Figure ). Compare your results with the Approximate Method and comment on the results.arrow_forwardA rectangular concrete slab, 3 m X 4.5 m, rests on the surface of a soil mass. The load on the slab is 2025 kN. Determine the vertical stress increase at a depth of 3 m (a) under the center of the slab, point A (see Figure); (b) under point B (see Figure); and (c) at a distance of 1.5 m from a corner, point C (see Figure). Compare your results with the Approximate Method and comment on the results. 4.5 m B 3 -1.5 m- Planarrow_forward
- Given the figure is the soil layer of a project site. The proposed building will exert a net stress of 12 Newtons per square cm. 4 m y=17.6 kN/m³ X=10.4 kN/m³ 11.2 m W-40% LL=40% 8.2 m X=27.3 kN/m³ a) Determine the buoyant unit weight of the clay. b) Determine the vertical effective stress at the midheight of the clay layer. c) Determine the average settlement of the normally consolidated clay layer. Fine Sand Soft Clayarrow_forward11.1 A vertical column load, P = 600 kN, is applied to a rigid concrete foundation with dimensions B = 1 m and L = 2 m, as shown in Figure 11.45. The founda- tion rests at a depth D₁ = 0.75 m on a uniform dense sand with the following properties: average modulus of elasticity, E¸ 20,600 kN/m², and Poisson's ratio, μ = 0.3. Estimate the elastic settlement due to the net applied pressure, Ao, on the foundation. Given: H = 5 m. Foundation BXL Figure 11.45 600 KN V 74 Ao Soil Ms = 0.3 Es = 20, 600 kN/m² Rock = 0.75 m 5.0 marrow_forwardThe plan of a flexiblerectangular loaded area is shown with a uniformly distributed load q =100 KN/m2. Determine the increasein the vertical stress (A6z) at Z= 2.0 meters bel ow (a) Point A = (b) Point B= (c) Point C= 4 m 1.6 m- 2 m 0.8 m q = 100 kN/m? C 1.2 m-arrow_forward
- A soil element is shown in the figure. Determine the following: 300 psf 1. a. Maximum and minimum principal stresses b. Normal and shear stresses on plane AB 250 psf 80 psf A + 35⁰ + B 80 psfarrow_forwardIV. A soil element is shown in Figure 3. (use equations) 130 kN/m² +35kN/m² 30⁰ 60 kN/m² 10 11. 12 + + B SITY FICAT 35 kN/m² Figure 3 What is the value of the maximum stress in kPa? What is the value of the normal stress acting at the plane AB in kPa? What is the value of the shear stress acting at the plane AB in kPa?arrow_forwardThe plan of a foundation of uniform thickness for a building is shown in Figure below. Determine the vertical stress increase at a depth of 4 m below the centroid (solve by using Newmark influence chart). The foundation applies a vertical stress of 200 kPa on the soil surface.arrow_forward
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