Principles of Foundation Engineering
9th Edition
ISBN: 9780357684832
Author: Das
Publisher: Cengage Learning US
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Chapter 15, Problem 15.3P
To determine
Find the settlement of the soil.
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What is the critical void ratio?
At what depth would the total vertical stress in a deposit of clay (e = 0.9, Gs = assume, consider 4 significant figures) overlain by 3 meters of sand (e = 1.1, assume Gs with 4 significant figures) be 220 kPa if the water table is 2 meters below the ground surface and saturation of 20 percent exists above it? What is the effective stress at the same depth? Draw your stress diagrams up until 2 meters deeper than the point at which the stress is 220 kPa.
Problem 1:
For uncompacted sandstone formation, the interval transit time was recorded as following:
Atiog
= 12 msec/ft.
Atsh = 125 msec/ft.
Atf = 189 msec/ft.
Calculate the formation porosity if the area:
1- Water zone
2- Oil zone
3- Gas zone
werm
、スe
Sonic loy
Chapter 15 Solutions
Principles of Foundation Engineering
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- What factors affect the permeability values of any rock.arrow_forwardd) A sandstone core plug is 1 inch in diameter, 2 inches long, and has a mass of 56.6 grams. When completely saturated with water, its mass increases to 60.9 grams. Compute the rock porosity.arrow_forwardA consolidated-undrained test on a normally consolidate clay yield the following results: Confining Pressure = 151 KPa; Deviator Stress = 187 KPa; Pore Pressure = 71 KPa. Calculate the consolidated undrained friction angle. Please answer this asap. For upvote. Thank you very mucharrow_forward
- A 5.1 m thick clay soil with a current overburden pressure of 89 kPa is going to experience an additional stress of 89 kPa after a new structure is built. If it was determined that the clay is normally consolidated has an initial void ratio of 1.2, a recompression index of 0.07, and a compression index of 0.47. Determine the total amount of settlement that is expected to occur. Provide your answer in meters to 3 decimal places.arrow_forwardh) Typical jointed rock core samples for BH5 shown in Figure 2, calculate RQD value for this core.arrow_forwardA consolidated-undrained test on a normally consolidate clay yield the following results: Confining Pressure = 159 KPa; Deviator Stress = 182 KPa; Pore Pressure = 79 KPa. Calculate the consolidated undrained friction angle.arrow_forward
- What is the pore compressibility of a rock with a bulk volume of 22 cm3, porosity of 19% and pore volume decreases by 0.06 cm3 when subjected to a confining pressure of 670psi?arrow_forwardQuestion 7 During the glacial period, the in situ stress of a clay formation was approximately 20,000 psf. Today, the in situ stress of that same clay is approximately 9500 psf. Which of the values below are most likely the OCR of the clay? O 1.65 O2.10 O 0.50 1.00arrow_forwardAt what depth would total the vertical stress in a deep deposit of clay (e = 1.1, Gs = 2.74) be 100 kPa if the water table is 1 m below the ground surface and the above the water surface a saturation degree of 70 % exists. What is the effective stress at the same depth?arrow_forward
- 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 930arrow_forwardWhat is the rating of the rock under " Strength of Intact Rock Material" parameter? A 7 B 15 C) 12 (D) 1arrow_forwardBorings indicate that at a Queens, NY site, the top 6 meters is a loose 2) , sand with a groundwater level at 3 meters below the ground surface. Below the sand is a 10 meter thick soft clay stratum. Assume sand unit weights are ymoist = 14 kN/cubic meter and ysat = 15 kN/cubic meter. Assume clay ysat = 19 kN/cubic meter. Calculate total, pore and effective stresses at 3, 12 and 16 meters deep.arrow_forward
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