1. For the square foundation below determine: a) ultimate settlement and b) settlement after 140 days due to consolidation of the clay layer. Base your calculations on the values at the midpoint of the layer. 8 ft 12 ft 8 ft 16 ft q=2200 psf SAND (COARSE) Yo 110 pcf G₁= 2.65 ROCK W=0.08 e=0.6 CLAY (NORM.CONSOL.) c,= 0.15 ft/day C = 0.42 ep = 1.2 G₁ =2.57 a) Sult = D.126 ft 5140 = 0.081 ft

1. For the square foundation below determine: a) ultimate settlement and b) settlement after 140 days due to consolidation of the clay layer. Base your calculations on the values at the midpoint of the layer. 8 ft 12 ft 8 ft 16 ft q=2200 psf SAND (COARSE) Yo 110 pcf G₁= 2.65 ROCK W=0.08 e=0.6 CLAY (NORM.CONSOL.) c,= 0.15 ft/day C = 0.42 ep = 1.2 G₁ =2.57 a) Sult = D.126 ft 5140 = 0.081 ft

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter11: Compressibility Of Soil

Section: Chapter Questions

Problem 11.2P

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A foundation with dimensions BxL supporting a column load, P. The foundation rests on a sandy soil underlain by a clay layer (consolidation test result in Problem 2). • Estimate the primary consolidation settlement of the clay due to the foundation load. • What is the void ratio at the end of primary consolidation? • Calculate the secondary Consolidation settlement after 6 years knowing that the primary consolidation settlement took 2.5 years. Given: P = 350 kN, B =L=2.5 m, Df= 2 m, H1= 3 m, and H2=4.5 m. The soil properties are as follows: Sand: ya = 16.4 kN/m³; ysat = 18.8 kN/m³ Clay: Ysat = 17.6 kN/m²; eo = 0.82, Ca=0.02 Sand D Yd H GWT BxL Ysat Clay Ysat Sandy gravel
STATEMENTS: A - an increase in volume is expected in 2:1 expanding type of clay when wet/saturated with water. B - cracking is expected when an expanding type of clay dries. A- both statements are trueB- neither statements are trueC- only statement A is true D- only statement B is true
Prob- The various approximations approaches described in this section can be used to compare K_a for both a normally consolidated (nc) clay and a clay with a known value of OCR = 5.0.
B=L=1.5 and Q = 100kN calculate the primary consilidation settlement of the foundation
Find the C, and the "apparent" OCR for a superficial clay stratum that is 4m thick. The water is at the surface. A sample of the clay has a water content of 27.9%, and a specific gravity of 2.65. An oedometer test showed the following results: Voids Ratio 0.736 0.733 0.73 0.675 0.638 0.6 Vertical Effective Stress 15 28 60 230 480 930
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Complete the following When cohesion soil reach full consolidation state, under the static load U = ..... ô Stress = õ Effective stress = settlement %3D
Civil Engineering 3. For the foundation shown in the figure, estimate the elastic settlement of the foundation using the strain influence factor method 15 years after construction. o1=又 pcf 10 x 10` 5 sand E=750 psi Y=l1opef 7.5 sand E-1200psi Y=120 pcf Sand E=1400psi Jalls pcf
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11.12 A 2-m clay layer in the field has a current effective stress, oó= 70 kN/m?. There is a net stress increase, Ao = 180 kN/m², due to a foundation load. Calculate the expected primary consolidation settlement. The results of a consolidation test on the clay are given below. o' (kN/m) 0.98 12 0.94 50 0.82 200 0.73 400 ©Cngage lamng 2014