Homework Answers
Soil water potential is defined as potential energy per unit quantity of water, relative to reference soil water potential.
- Soil 1 is in adsoption / wetting curve and soil 2 is in drying curve.
- For a given matric potential, water content in the soil 2 is higher than that soil in the soil 1.
- Soil 1 has large pore radius while soil 2 have smaller pore radius.
- Presence of entrapped air in soil 1.
- therefore grain size is more in soil 1 and regarding grain size distribution, it wildly vary in soil 1.. i.e, soil 1 is sandy type while soil 2 is clayey type.
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PART II SOIL WATER POTENTIAL The objective of this part is to illustrate the relatio this...
The figure below shows the soil profile conditions below a 5-m deep pond. Water is seeping directly downward und...
The figure below shows the soil profile conditions below a 5-m deep pond. Water is seeping directly downward under steady-state conditions through the clay layer into underlying gravel. Assume the elevation datum at the top of the gravel layer and that the hydrostatic ground water table is also found in the top of the gravel and its position does not change with time or amount of flow. For these flow conditions, calculate the following: a. b. c. d. e. f....
Question 1 5 pts A clay layer is shown in the figure below. The OCR at...
Question 1 5 pts A clay layer is shown in the figure below. The OCR at point Ais 1. If the water table rises to the ground surface, then the OCR at point A becomes ym Ground surface Clay 2m Clay Figure: The clay layer profile. Answer (Round to 1 decimal place): Question 2 5 pts In a Casagrande's liquid limit test, the moisture content for a soil sample was 80% at 10 blows and 30% at 100 blows. The...
In the figure below, the natural soil profile consists of sand overlying clay overlying sand overlying bedrock. A water...
In the figure below, the natural soil profile consists of sand
overlying clay overlying sand overlying bedrock. A
water table is present 1 m beneath the surface of the natural
ground. If 4 m of consistent fill material (γfill = 15
kN/m3) was placed on top of this soil profile that covered a
large area, determine:
(a) The consolidation settlement of the clay layer (using 4
equal layers in your calculation), and
(b) The time (in days) for this consolidation...
PROBLEMS 1. Figure 9.18 is representative of soil conditions at a construction site. If you are t...
Please I need help to solve these problems
PROBLEMS 1. Figure 9.18 is representative of soil conditions at a construction site. If you are the con- tractor, select a dewatering method you would consider appropriate for each of the projects described below. Consider the information given in this chapter, earlier chapters and any be built and operated. Justify clearly any assumptions you make. Discuss what difficulties other information that may be appropriate. Describe in detail how your sy stem would...
(4). (8 pts). A soil profile is shown in below Figure. A uniformly distributed load Ao is applied at the surface of soil. Given the preconsolidation pressure is between swell index and compressio...
(4). (8 pts). A soil profile is shown in below Figure. A uniformly distributed load Ao is applied at the surface of soil. Given the preconsolidation pressure is between swell index and compression index is: C C/6. The unit weight of water is: -9.38 kN/m. If U-98% we regard it as a completion of primary consolidation. We have taken the clay sample and done the Atterberg Limit test. For the liquid limit test, the result is as below. Please ơ'-926...
X=22 QUESTION 3 (30 marks) A soil profile at a site is shown in Figure 1....
X=22
QUESTION 3 (30 marks) A soil profile at a site is shown in Figure 1. A soil specimen is taken from the middle of the clay layer and subjected to a consolidation test, and following properties are reported. • Moisture content of clay = 15% • Specific gravity of soil grains = 2.7 OCR=3.0 • Compression Index (Cc)=0.5 • Recompression Index (Cr)=0.04 a) Calculate the effective vertical stress at the middle of the clay layer (10 marks) b) Calculate...
For the soil strata, draw diagrams indicating the total stress, pore pressure and effective stress profiles...
For the soil strata, draw diagrams indicating the total stress, pore pressure and effective stress profiles to the bottom of clay layer. Fine sand has a thickness of 6 m (FST) with saturated unit weight of 18 kN/m2. Clay has a thickness of 8 m with saturated unit weight of 14 kN/m3 The water table is located at depth of 0.7 of fine sand thickness below the ground surface (i.e. depth=0.7*FST). Fine sand will sustain capillarity (suction). Assume the same...
Q8 An oil tank, 20 m in diameter, is to be built on a site where the soil profile consists of 4 m of dense gravel overl...
Q8 An oil tank, 20 m in diameter, is to be built on a site where the soil profile consists of 4 m of dense gravel overlying 3 m of clay overlying rigid impermeable rock, and the water table is 1 m below the soil surface. If the tank applies a uniform pressure of 100 kPa to the surface of the soil calculate the differential settlement between the centre and perimeter of the tank after 1 year and after many...
A 12 m high retaining wa is built to retain a 3-layered soil profile shown in...
A 12 m high retaining wa is built to retain a 3-layered soil profile shown in Figure 2. The soil parameters are given in the figure. During raining season, ground water rises to interface between Soil 1 and Soil 2. Assume that there is no friction between the vertical wall and the soils. (i) Find the surface surcharge q that would just close the tensile crack on the ground surface at the active failure stage of the retaining wall. (5...
Question 1 Water flows through the round tube with 50mm diameter shown in the figure. You...
Question 1 Water flows through the round tube with 50mm diameter shown in the figure. You are given that k=1.2x105 m/s and kp=5.0x10 m/s, calculate the following: 130mm 200mm Datum a) The monometer head at position 1 b) The potential at position 1 c) If material Ais replaced by material B, so that the 330mm column of soil consists of material Bonly, calculate the flow rate.
The figure below shows the soil profile conditions below a 5-m deep pond. Water is seeping directly downward under steady-state conditions through the clay layer into underlying gravel. Assume the elevation datum at the top of the gravel layer and that the hydrostatic ground water table is also found in the top of the gravel and its position does not change with time or amount of flow. For these flow conditions, calculate the following: a. b. c. d. e. f....
Question 1 5 pts A clay layer is shown in the figure below. The OCR at point Ais 1. If the water table rises to the ground surface, then the OCR at point A becomes ym Ground surface Clay 2m Clay Figure: The clay layer profile. Answer (Round to 1 decimal place): Question 2 5 pts In a Casagrande's liquid limit test, the moisture content for a soil sample was 80% at 10 blows and 30% at 100 blows. The...
In the figure below, the natural soil profile consists of sand
overlying clay overlying sand overlying bedrock. A
water table is present 1 m beneath the surface of the natural
ground. If 4 m of consistent fill material (γfill = 15
kN/m3) was placed on top of this soil profile that covered a
large area, determine:
(a) The consolidation settlement of the clay layer (using 4
equal layers in your calculation), and
(b) The time (in days) for this consolidation...
Please I need help to solve these problems
PROBLEMS 1. Figure 9.18 is representative of soil conditions at a construction site. If you are the con- tractor, select a dewatering method you would consider appropriate for each of the projects described below. Consider the information given in this chapter, earlier chapters and any be built and operated. Justify clearly any assumptions you make. Discuss what difficulties other information that may be appropriate. Describe in detail how your sy stem would...
(4). (8 pts). A soil profile is shown in below Figure. A uniformly distributed load Ao is applied at the surface of soil. Given the preconsolidation pressure is between swell index and compression index is: C C/6. The unit weight of water is: -9.38 kN/m. If U-98% we regard it as a completion of primary consolidation. We have taken the clay sample and done the Atterberg Limit test. For the liquid limit test, the result is as below. Please ơ'-926...
X=22
QUESTION 3 (30 marks) A soil profile at a site is shown in Figure 1. A soil specimen is taken from the middle of the clay layer and subjected to a consolidation test, and following properties are reported. • Moisture content of clay = 15% • Specific gravity of soil grains = 2.7 OCR=3.0 • Compression Index (Cc)=0.5 • Recompression Index (Cr)=0.04 a) Calculate the effective vertical stress at the middle of the clay layer (10 marks) b) Calculate...
For the soil strata, draw diagrams indicating the total stress, pore pressure and effective stress profiles to the bottom of clay layer. Fine sand has a thickness of 6 m (FST) with saturated unit weight of 18 kN/m2. Clay has a thickness of 8 m with saturated unit weight of 14 kN/m3 The water table is located at depth of 0.7 of fine sand thickness below the ground surface (i.e. depth=0.7*FST). Fine sand will sustain capillarity (suction). Assume the same...
Q8 An oil tank, 20 m in diameter, is to be built on a site where the soil profile consists of 4 m of dense gravel overlying 3 m of clay overlying rigid impermeable rock, and the water table is 1 m below the soil surface. If the tank applies a uniform pressure of 100 kPa to the surface of the soil calculate the differential settlement between the centre and perimeter of the tank after 1 year and after many...
A 12 m high retaining wa is built to retain a 3-layered soil profile shown in Figure 2. The soil parameters are given in the figure. During raining season, ground water rises to interface between Soil 1 and Soil 2. Assume that there is no friction between the vertical wall and the soils. (i) Find the surface surcharge q that would just close the tensile crack on the ground surface at the active failure stage of the retaining wall. (5...
Question 1 Water flows through the round tube with 50mm diameter shown in the figure. You are given that k=1.2x105 m/s and kp=5.0x10 m/s, calculate the following: 130mm 200mm Datum a) The monometer head at position 1 b) The potential at position 1 c) If material Ais replaced by material B, so that the 330mm column of soil consists of material Bonly, calculate the flow rate.
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