Q4 The old building (A) is to be removed and replaced by a new building (B), as shown in the Figure. The vertical pressure at the center of the clay layer from the building (A) and building (B) is equal to 13.64 kN/m² and 23.3 kN/m² respectively. Find:- 1. O.C.R after removing building (A). 2. The void ratio (e) of the clay layer immediately after removing building (A). 3. Time required to achieve half the final consolidation settlement of building (B). 2m 8m Old building (A) Sand, y15 kN/m² Clay, y=20 w-30% G₂-2.7, C₂-0.2, C,-0.04, C,-0.5m²/yr N.G.L ZW.T.L.

Q4 The old building (A) is to be removed and replaced by a new building (B), as shown in the Figure. The vertical pressure at the center of the clay layer from the building (A) and building (B) is equal to 13.64 kN/m² and 23.3 kN/m² respectively. Find:- 1. O.C.R after removing building (A). 2. The void ratio (e) of the clay layer immediately after removing building (A). 3. Time required to achieve half the final consolidation settlement of building (B). 2m 8m Old building (A) Sand, y15 kN/m² Clay, y=20 w-30% G₂-2.7, C₂-0.2, C,-0.04, C,-0.5m²/yr N.G.L ZW.T.L.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Consolidation

Section: Chapter Questions

Problem 9.12P

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2- An undisturbed clay has a preconsolidation pressure of 200 lb/ft. A laboratory consolidation tests yield the following data: o' (lb/ft') e 0.92 3,130 6,270 0.77 a) Determine the void ratio that corresponds to a pressure of 5,800 (Ib/ft). b) Determine the coefficient of volume compressibility for the pressure range stated. c) If C, = 1 x 10* in?/sec, determine hydraulic conductivity, k in in/sec corresponding to the average void ratio within the pressure range.
The coefficient of permeability of a sand at a void ratio of 0.62 is 0.03 cm/sec. estimate the coefficient of permeability at a void ratio of 0.48. a. Using Casagrande equation b. Using kozeny - Carman equation.
The old building (A) is to be removed and replaced by a new building (B), as shown in the Figure. The vertical pressure at the centre of the clay layer from the building (A) and building (B) is equal to 13.64 kN/m and 23.3 kN/m² respectively. Find:- 1. O.C.R after removing building (A). (Ans: OCR =1.198) 2. The void ratio (e) of the clay layer immediately after removing building (A). (e = 0.7977) 3. Time required to achieve half the final consolidation settlement of building (B). (25.09 years) Old building (A) 2m Sand, Yary= 15 kN/m? W.T. Clay Yat - 20 kN /m, e, - 0.81 C- 0.2, C, = 0.04, c, = 0.5 m²/yr 8m Rock
Q.10 A soil stratum is 10 m thick with pervious stratum on top and bottom. The time required for 50% consolidation is (b) 426 days (d) 680 days (a) 360 days (c) 570 days Coefficient of permeability = 10-7 cm/s Coefficient of compression = 0.0003 cm²/gm Void ratio = 2 Time factor = 0.197
A sand has Gs = 2.66. Calculate the hydraulic gradient that will cause boiling for e = 0.35, 0.45, 0.55, 0.7, and 0.8.
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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i. A sandstone core sample is saturated 100% with water. Calculate the absolute permeability of the core sample if the water is flowing at 6.21 cubic centimetres per second. The length of the core sample is 14 centimetres and its diameters is 6 centimetres. The pressure differential across the core sample is 15 atmospheric pressure and the water viscosity is 1.2 centipoises. Explain a method of how the permeability of low permeability reservoirs can be ii. improved.
For a laboratory consolidation test on a clay specimen (drained both sides), the following were obtained. Thickness of the clay layer = 25mm o_1 = 200KN/m^2 o'2 = 400KN/m^2 e_1 = 0.73 e_2 = 0.61 Time for 50% consolidation (t_50 = 2.8min: From table U = 50%, Tv = 0.197 %3D Determine the hydraulic conductivity (in cm/sec) of the clay for the loading range.
The coefficient of permeability of a sand at a void ratio of 0.62 is 0.03 cm/s. Estimate the coefficient of permeability at a void ratio of 0.48 using Casagrande equation.
A CID TXC test was performed on a sample of sand. At the end of consolidation, the back pressure was 140 kPa, and the cell pressure was 340 kPa. At failure, the deviator stress was (ơ1 – 03)f = 200 kPa. a. What was the total pore water pressure, u, at failure? b. Calculate the principle effective stresses, ơi' and os', at failure. c. Calculate the friction angle, d', for this soil.
answer 10 onl 1. When consolidation of a saturated soil sample occurs, the degree of saturation A.Increases B.Decreases C.Remains constant D.May increase or decrease 2. The process opposite to consolidation is called swelling, which involves an increase in the volume of the voids due to the water content A.Decreasing B.Increasing C.Equalize D. None of the above 3. OC: is refer to A. An over consolidation ratio as the ratio of the preconsolidation pressure to the present vertical effective stress. (B. A normally consolidated clay is defined as a clay that has a present (in situ) vertical effective stress oo' equal to its preconsolidation pressure oc C. An overconsolidated clay is defined as a clay that has a present vertical effective stress of less than its preconsolidation pressure D. None of the above Сс 4. Coefficient of consolidation of a soil is affected by A.Compressibility B.Permeability C.Both compressibility and permeability D.None of the above 5. The shear strength of a soil…