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4. A slope is shown in the figure below. The potential shear failure plane is labeled...
A geotechnical engineer is evaluating the stability of a natural sandy soil slopc as shown nextpa) This evaluation is considering the potential for a shear failurc along the shear surface shown. Mois...
A geotechnical engineer is evaluating the stability of a natural sandy soil slopc as shown nextpa) This evaluation is considering the potential for a shear failurc along the shear surface shown. Moist unit weight of the sandy soil, y- 120 Ib/ft 14 ft Saturated unit weight of the sandy soil, s 123 lb/ft 12 ft The soil has a drained friction angle of 30 deg, and no cohesive strength. 20 ft Potential shear (A) Compute the soil shear strength at...
A slope on the side of a hill is cut to make space for a wider sidewalk. The soil behind the slope will be supported with a concrete block that will rest on a highly plastic clay. Slope Concrete...
A slope on the side of a hill is cut to make space for a wider sidewalk. The soil behind the slope will be supported with a concrete block that will rest on a highly plastic clay. Slope Concrete Side walk block Figure 1.Scheme of the problem Assuming a 2D problem, the geometry of the block is: height (H) 5 ft and width (W)-8 ft. Consider the depth as a unity. A direct shear test is conducted on the clay...
The following case study involving a failure in fissured over-consolidated clay slope was reported by Henkel...
The following case study involving a failure in fissured over-consolidated clay slope was reported by Henkel and Skempton in 1954. The failure occurred in 1952 in Jackfield, Shropshire, England. The slope profile is shown in Figure 1. The failure was a translational slide where the average depth to the failure plane was 17 ft. The ground water table was very near or at the surface. The peak strength parameters of the over-consolidated clay are: cohesion, c'= 220 psf and friction...
4) A large slope is constructed as shown in the figure below. A failure surface is...
4) A large slope is constructed as shown in the figure below. A failure surface is considered passing through the crest and the toe of the slope. The soil properties are y= 18 kN/m2, c 0 kPa and =25°. The water table is well below the ground surface Using the theory for the stability of an infinite slope, estimate the factor of safety. [5 а. marks] b. Use Fellenius' method to determine the Factor of Safety against failure. [13 marks]...
4. Shear Strength A sample of cohesive soil with undrained shear strength of 30 Kpa is beng tested in a triaxial est with a confining pressure of 15 Kpa (see the figure below). Sketch the failure...
4. Shear Strength A sample of cohesive soil with undrained shear strength of 30 Kpa is beng tested in a triaxial est with a confining pressure of 15 Kpa (see the figure below). Sketch the failure envelope and Mohr's circle representing the state of stress at failure. Evaluate the following: (i) The vertical axial stress at failure. (ii) The major and minor principal stresses at failure (ii) The orientation of failure plane with respect to horizontal plane. (iv) The normal...
A 6 m deep slope is going to be excavated in a deep soil deposit. The...
A 6 m deep slope is going to be excavated in a deep soil
deposit. The geometry of the slope is shown in
the following figure. Assume. The soil has the following
properties:
t = 20 kN/m3, cu = 20 kPa, = 5o
Water table is well below the toe of the embankment.
(a) Calculate the slope batter angle, , for which slope failure
would occur.
(b) Assume a slope batter angle of ranging from 40o to 60o...
3. The bearing capacity of shallow foundations (i.e. footings) depends on the soil shear strength (ie....
3. The bearing capacity of shallow foundations (i.e. footings) depends on the soil shear strength (ie. ф and c). The ultimate bearing capacity (qultnei) of the soil is calculated using the following equation: Dr qult.net bearing capacity failure surface i. Frictional resistance along failure surface due to self-weight of soil below footing level footing level. Ny. No, and Ng are dimensionless bearing capacity factors that depend on the ii. Cohesive resistance along failure surface below footing level. iii. Frictional resistance...
Question 8 (12) Given following properties for the soil in the figure below, Ya 110 lbf/ft3...
Question 8 (12) Given following properties for the soil in the figure below, Ya 110 lbf/ft3 Above the water table Yb 130 lbf/ft3 Below the water table C- 200 lbf/ ft .Knou Pore water pressarc Know total Stress 30° a) Compute the effective stress at the point D (bottom of the foundation) b) Compute the bearing capacity of the foundation using Terzaghi's bearing capacity equation and factors W 1000 lbf/ ft Water Table 4 |Page 20f
Geomechanics (b) Figure 1 shows a water retaining embankment with a slope of 1:2 (vertical kN/m'....
Geomechanics
(b) Figure 1 shows a water retaining embankment with a slope of 1:2 (vertical kN/m'. The clay soil has an undrained cohesion of 30 kPa and a saturated unit weight of i18 following information is given: Area FBDE-42m2 (above water level) Centroidal distance dA-13m Area AED 144m2 (below water level) Centroidal distance, ds -4.5m Angle AOF-83 Radius of circular slip plane, R- 22.5m (i) Determine the total disturbing moment by considering the forces Wa Ws and Pw (Gfi) Determine...
1. Using the concepts covered in earth pressure theories (not Taylor's chart), the critical depth of...
1. Using the concepts covered in earth pressure theories (not Taylor's chart), the critical depth of vertical cut in a saturated cohesive soil with c = 15.5kPa and y = 18 kN/m3 will be? a) 0.86 m c) 6.88 m b) 3.44 m d) 1.72 m condition: 2. The upstream and downstream slopes of an earth dam is critical for the a) reservoir partial pool c) steady seepage b) sudden drawdown d) earthquake 3. In the simplified Bishop's method of...
A geotechnical engineer is evaluating the stability of a natural sandy soil slopc as shown nextpa) This evaluation is considering the potential for a shear failurc along the shear surface shown. Moist unit weight of the sandy soil, y- 120 Ib/ft 14 ft Saturated unit weight of the sandy soil, s 123 lb/ft 12 ft The soil has a drained friction angle of 30 deg, and no cohesive strength. 20 ft Potential shear (A) Compute the soil shear strength at...
A slope on the side of a hill is cut to make space for a wider sidewalk. The soil behind the slope will be supported with a concrete block that will rest on a highly plastic clay. Slope Concrete Side walk block Figure 1.Scheme of the problem Assuming a 2D problem, the geometry of the block is: height (H) 5 ft and width (W)-8 ft. Consider the depth as a unity. A direct shear test is conducted on the clay...
The following case study involving a failure in fissured over-consolidated clay slope was reported by Henkel and Skempton in 1954. The failure occurred in 1952 in Jackfield, Shropshire, England. The slope profile is shown in Figure 1. The failure was a translational slide where the average depth to the failure plane was 17 ft. The ground water table was very near or at the surface. The peak strength parameters of the over-consolidated clay are: cohesion, c'= 220 psf and friction...
4) A large slope is constructed as shown in the figure below. A failure surface is considered passing through the crest and the toe of the slope. The soil properties are y= 18 kN/m2, c 0 kPa and =25°. The water table is well below the ground surface Using the theory for the stability of an infinite slope, estimate the factor of safety. [5 а. marks] b. Use Fellenius' method to determine the Factor of Safety against failure. [13 marks]...
4. Shear Strength A sample of cohesive soil with undrained shear strength of 30 Kpa is beng tested in a triaxial est with a confining pressure of 15 Kpa (see the figure below). Sketch the failure envelope and Mohr's circle representing the state of stress at failure. Evaluate the following: (i) The vertical axial stress at failure. (ii) The major and minor principal stresses at failure (ii) The orientation of failure plane with respect to horizontal plane. (iv) The normal...
A 6 m deep slope is going to be excavated in a deep soil
deposit. The geometry of the slope is shown in
the following figure. Assume. The soil has the following
properties:
t = 20 kN/m3, cu = 20 kPa, = 5o
Water table is well below the toe of the embankment.
(a) Calculate the slope batter angle, , for which slope failure
would occur.
(b) Assume a slope batter angle of ranging from 40o to 60o...
3. The bearing capacity of shallow foundations (i.e. footings) depends on the soil shear strength (ie. ф and c). The ultimate bearing capacity (qultnei) of the soil is calculated using the following equation: Dr qult.net bearing capacity failure surface i. Frictional resistance along failure surface due to self-weight of soil below footing level footing level. Ny. No, and Ng are dimensionless bearing capacity factors that depend on the ii. Cohesive resistance along failure surface below footing level. iii. Frictional resistance...
Question 8 (12) Given following properties for the soil in the figure below, Ya 110 lbf/ft3 Above the water table Yb 130 lbf/ft3 Below the water table C- 200 lbf/ ft .Knou Pore water pressarc Know total Stress 30° a) Compute the effective stress at the point D (bottom of the foundation) b) Compute the bearing capacity of the foundation using Terzaghi's bearing capacity equation and factors W 1000 lbf/ ft Water Table 4 |Page 20f
Geomechanics
(b) Figure 1 shows a water retaining embankment with a slope of 1:2 (vertical kN/m'. The clay soil has an undrained cohesion of 30 kPa and a saturated unit weight of i18 following information is given: Area FBDE-42m2 (above water level) Centroidal distance dA-13m Area AED 144m2 (below water level) Centroidal distance, ds -4.5m Angle AOF-83 Radius of circular slip plane, R- 22.5m (i) Determine the total disturbing moment by considering the forces Wa Ws and Pw (Gfi) Determine...
1. Using the concepts covered in earth pressure theories (not Taylor's chart), the critical depth of vertical cut in a saturated cohesive soil with c = 15.5kPa and y = 18 kN/m3 will be? a) 0.86 m c) 6.88 m b) 3.44 m d) 1.72 m condition: 2. The upstream and downstream slopes of an earth dam is critical for the a) reservoir partial pool c) steady seepage b) sudden drawdown d) earthquake 3. In the simplified Bishop's method of...
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