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6. (former exam question) A large granular free draining fill 6-ft thick was placed on a...
Show all work 20-ft thick fill is planned to be placed at a construction site. Ground settlement is of concern due...
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20-ft thick fill is planned to be placed at a construction site. Ground settlement is of concern due to high compressibility of the clay layer. A consolidation test was performed on a sample collected from the center of the 15-ft thick clay layer. On the following page, e-logp curve obtained from the test is included. Estimate ground settlement based on the information provided. Hint: Don't forget to correct the curve for field conditions. Ifơ0 is within 10%...
2) You are given the soil deposit shown below. Assume c,-0.1 ftiday and c0.1 ftday. You...
2) You are given the soil deposit shown below. Assume c,-0.1 ftiday and c0.1 ftday. You have previously calculated that the total ultimate settlement of the clay layer will be 131 ft and it will take 1,908 days to achieve an average degrec of consolidation of 90%. Consider these two options for OPTION : SURCHARGE If you want to accelerate settiement such that an average degree of consolidation of 90% would be achieved in 2 years, how much surcharge would...
3. Shear Strength a. Plot the effective stress Mohr-Coulomb failure envelope for a soil with c'-500...
3. Shear Strength a. Plot the effective stress Mohr-Coulomb failure envelope for a soil with c'-500 b. A plane through a sample of this soil has an effective normal stress of c. Use a Mohr circle that touches the failure enve psf and 32 deg. acting on it. What is the shear strength of the soil on that plane? of 2000 psf to estimate the values of σ, and σ, at a state of shear failure 2000 psf lope at...
(5 points) 6. A soil profile consists of 4 ft of organic soil (a 75 pe)...
(5 points) 6. A soil profile consists of 4 ft of organic soil (a 75 pe) over a uniform soft clay layer. For the clay y 120 pcf and, ?'/o 1.0 The water table is at the ground surface. For a clay element A, at the depth of 10 feet from the ground surface (6 feet into the soft clay) compute the following Assume a wide fill, thickness 7 feet, ? 105 pcf is placed over the surface of the...
7) (Total 20 pts) The figure shows a 20 m thick layer of normally consolidated clay...
7) (Total 20 pts) The figure shows a 20 m thick layer of normally consolidated clay (Y -18.6 kN/m3) that is one-dimensionally loaded by Δσ,-50kPa. The clay layer is below a 3 m thick layer of granular fill (y = 19.6 kN/m3), and a dense, compacted glacial till (impermeable) underlies the clay. The water table is located at the top of the clay layer. A 1-D consolidation test is performed on a 2.20 cm thick, doubly drained specimen from the...
Question 5 (Effective Stress & Consolidation) Figure 05 shows the soil profile of a construction site....
Question 5 (Effective Stress & Consolidation) Figure 05 shows the soil profile of a construction site. The water table is at the ground surface. Saturated unit weight of the sand is 18.8kN/m' and that of the clay is 19.6kN/m. Assume permeability of the clay is very low and unit weight of water is 10kN/m'. Water Table Sand 5m Clay 6m Figure 05 a) Determine the vertical total stress, pore water pressure, and vertical effective stress at the mid-height of the...
QO vreme (b/n) (6) 3. A 40 ft layer of silty clay is overlain by 5ft...
QO vreme (b/n) (6) 3. A 40 ft layer of silty clay is overlain by 5ft of 1000 2000 3000 4000 sand. The base of the clay layer lies over an impervious siltstone bedrock. Water table is at ground surface and is hydrostatic in the clay layer. The initial vertical effective stress do'and maximum past pressure profiles with depth are plotted in the Figure to the right. Initial void ratio e, -0.95. One- dimensional consolidation test results yielded the following:...
1. An 8-m thick normally consolidated clay layer is doubly drained as shown below. (This means...
1. An 8-m thick normally consolidated clay layer is doubly drained as shown below. (This means that a very pervious layer compared to the clay exists on top of and under the clay layer) The embankment applied an average vertical stress increase of 100 kPa to the clay layer. The water table is located at the mid depth of the sand layer. Assume the sand above the water table is dry 0 Pore water pressure, u (kPa) 20 40 60...
A 2-m thick of compacted soil of unit weight 20 kN/m3 will be placed on the top of the ground surface. Δσ y...
A 2-m thick of compacted soil of unit weight 20 kN/m3 will be placed on the top of the ground surface. Δσ y 14.0 kN/m3 3.0 m Sand Y 17.5 kN/m3 2.0 m 3.0m A Soft clay y= 13.5 kN/m3 6.0 m Medium clay y=15.0 kN/m3 B 4.0 m Bedrock a) Before placing the compacted soil, what are the overconsolidation ratios (OCR) for point A and B? b) When placing the compacted soil, what external load Ag would be? c)...
An extensive filling project to form a platform for a subdivision housing development is proposed...
An extensive filling project to form a platform for a
subdivision housing development is proposed. Preliminary data based
on several site investigation boreholes suggests that the geology
of the proposed site is as shown in Figure 1, which implies the
fill will be placed over a swampy area of soft saturated normally
consolidated clay overlaying a bed of relatively incompressible
well-drained dense sand. The water table in the clay layer is at
the surface of the clay layer, and it...
Show all work
20-ft thick fill is planned to be placed at a construction site. Ground settlement is of concern due to high compressibility of the clay layer. A consolidation test was performed on a sample collected from the center of the 15-ft thick clay layer. On the following page, e-logp curve obtained from the test is included. Estimate ground settlement based on the information provided. Hint: Don't forget to correct the curve for field conditions. Ifơ0 is within 10%...
2) You are given the soil deposit shown below. Assume c,-0.1 ftiday and c0.1 ftday. You have previously calculated that the total ultimate settlement of the clay layer will be 131 ft and it will take 1,908 days to achieve an average degrec of consolidation of 90%. Consider these two options for OPTION : SURCHARGE If you want to accelerate settiement such that an average degree of consolidation of 90% would be achieved in 2 years, how much surcharge would...
3. Shear Strength a. Plot the effective stress Mohr-Coulomb failure envelope for a soil with c'-500 b. A plane through a sample of this soil has an effective normal stress of c. Use a Mohr circle that touches the failure enve psf and 32 deg. acting on it. What is the shear strength of the soil on that plane? of 2000 psf to estimate the values of σ, and σ, at a state of shear failure 2000 psf lope at...
(5 points) 6. A soil profile consists of 4 ft of organic soil (a 75 pe) over a uniform soft clay layer. For the clay y 120 pcf and, ?'/o 1.0 The water table is at the ground surface. For a clay element A, at the depth of 10 feet from the ground surface (6 feet into the soft clay) compute the following Assume a wide fill, thickness 7 feet, ? 105 pcf is placed over the surface of the...
7) (Total 20 pts) The figure shows a 20 m thick layer of normally consolidated clay (Y -18.6 kN/m3) that is one-dimensionally loaded by Δσ,-50kPa. The clay layer is below a 3 m thick layer of granular fill (y = 19.6 kN/m3), and a dense, compacted glacial till (impermeable) underlies the clay. The water table is located at the top of the clay layer. A 1-D consolidation test is performed on a 2.20 cm thick, doubly drained specimen from the...
Question 5 (Effective Stress & Consolidation) Figure 05 shows the soil profile of a construction site. The water table is at the ground surface. Saturated unit weight of the sand is 18.8kN/m' and that of the clay is 19.6kN/m. Assume permeability of the clay is very low and unit weight of water is 10kN/m'. Water Table Sand 5m Clay 6m Figure 05 a) Determine the vertical total stress, pore water pressure, and vertical effective stress at the mid-height of the...
QO vreme (b/n) (6) 3. A 40 ft layer of silty clay is overlain by 5ft of 1000 2000 3000 4000 sand. The base of the clay layer lies over an impervious siltstone bedrock. Water table is at ground surface and is hydrostatic in the clay layer. The initial vertical effective stress do'and maximum past pressure profiles with depth are plotted in the Figure to the right. Initial void ratio e, -0.95. One- dimensional consolidation test results yielded the following:...
1. An 8-m thick normally consolidated clay layer is doubly drained as shown below. (This means that a very pervious layer compared to the clay exists on top of and under the clay layer) The embankment applied an average vertical stress increase of 100 kPa to the clay layer. The water table is located at the mid depth of the sand layer. Assume the sand above the water table is dry 0 Pore water pressure, u (kPa) 20 40 60...
A 2-m thick of compacted soil of unit weight 20 kN/m3 will be placed on the top of the ground surface. Δσ y 14.0 kN/m3 3.0 m Sand Y 17.5 kN/m3 2.0 m 3.0m A Soft clay y= 13.5 kN/m3 6.0 m Medium clay y=15.0 kN/m3 B 4.0 m Bedrock a) Before placing the compacted soil, what are the overconsolidation ratios (OCR) for point A and B? b) When placing the compacted soil, what external load Ag would be? c)...
An extensive filling project to form a platform for a
subdivision housing development is proposed. Preliminary data based
on several site investigation boreholes suggests that the geology
of the proposed site is as shown in Figure 1, which implies the
fill will be placed over a swampy area of soft saturated normally
consolidated clay overlaying a bed of relatively incompressible
well-drained dense sand. The water table in the clay layer is at
the surface of the clay layer, and it...
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