2: A (4m*8m) rectangular flexiblefoundation is placed above the ground surface fortwo layers of clay, for each layer 12m thick, The modulusof Elasticity (Eu) of the upper layer is 15 MN/m² and thatof the lower is 25 MN/m². The Poisson ratio is (M = 0.3535)for the two layers and the Column load is 90 KN. Determinethe immediate settlement at the Corner of the foundationusing Elastic theory method?

Answered: 2: A (4m*8m) rectangular flexible…

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter8: Mat Foundations

Section: Chapter Questions

Problem 8.7P

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The soil profile at a site consists of 10 m of gravelly sand underlain by a soft clay layer. The water table lies 1 m below the ground level. The moist and saturated unit weights of the gravelly sand are 17.0 kN/m3 and 20.0 kN/m3, respectively. Due to some ongoing construction work, it is proposed to lower the water table to 3 m below the ground level. What will be the change in the effective stress on top of the soft clay layer?
The soil profile at a site consists of 10 m of gravelly sand underlain by a soft clay layer. The water table lies 1 m below the ground level. The moist and saturated unit weights of the gravelly sand are 17.0 kN/m3 and 20.0 kN/m3, respectively. Due to some ongoing construction work, it is proposed to lower the water table to 3 m below the ground level. What will be the change in the effective stress on top of the soft clay layer?
Estimate the increase in vertical stress at 0.5 m depth intervals, within the clay layer, below point A (See figure below). The foundation exerts a uniform vertical stress of 120 kPa at ground level. Using these values estimate the settlement due to the clay layer. (Hand in any graphs used) 5m 5m 2m 3m Very Dense Sand 2m 1.5m Clay E=3.5 MPa 2m Bedrock Soil profile A Plan of building 3m Soil profile and plan for Question 4 3m FA
Problem3) A rectangular concrete slab, 3m×4m, rests on the surface of a 8m fully saturated clayey soil. Water content of the soil is 43%. The load on the slab is 5000KN. Determine the vertical stress increase at a depth of 4m under the center of the slab, point C. Then, calculate the primary consolidation settlement. ( Сс-0.3 4 m
Q-f Calculate the settlement of the bridge pier shown in Fig. Q-f (page 3) due to primary consolidation of the clay. The bridge load imposes an approximate vertical stress increase at the center of the clay layer of 150 kPa. 9 m 1 m 1 m 12 MN Pier: 3 m x 10 m 3 m 5 m Dense sand e = 0.45 E' = 55 MPa v' = 0.35 $' = 36° Normally consolidated clay eo = 0.85 E' = 15 MPa Sand and gravel Cc = 0.3 (su) f = 40 kPa v' = 0.25, vμ = 0.45 c = 30°
A soil has c′ = 5 kPa and f′ = 32°. The effective stress at a point in the soil is 125 kPa. Com-pute the shear strength normal to this stress at this point.
Answer 4 then use the answer from 4 to answer 5
answer should be on the choices
4. A square foundation will be constructed at ground surface. The subsoil profile is shown in the figure below. The mat will have a net uniform load of 500 psf at El. O. The mat will have a net uniform load (Induce stress) at El. -15 of 360 psf, the primary consolidation settlement (in.) of the clay layer directly below the center of the foudnation is? fr ORIGINAL GROUND SURFACE ELEV. O ft ELEV-5 ft. ELEV-10 ft ELEV-20 ft 30 ft SAND Y = 115 pcf MAT FOUNDATION SAND Y = 105 pcf GROUNDWATER TABLE NORMALLY CONSOLIDATED CLAY SATURATED UNIT WEIGHT = 95 pcf COMPRESSION INDEX C₂ = 0.29 VOID RATIO=1.0
No need to input units in final answer
The soil profile at a road construction site is as shown in figure (not to scale). A large embankment is to be constructed at the site. The ground water table (GWT) is located at the surface of the clay layers, and the capillary rise in the sandy soil is negligible. The effective stress at the middle of the clay layer after the application of the embankment loading is 180 kN/m². Take unit weight of water, Yw = 9.81 kN/m3. Embankment load boudi Sand GWT 2m y = 18.5 kN° it enit Clay Specific gravity, G̟ = 2.65 Water content, w = 45% Compession index, C. = 0.25 6m %3D %3D Impermeable layer The primary consolidation settlement (in m, round off to two decimal places) of the clay layer resulting from this loading will be
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