Code No: R05410107
R05
Set No. 2
in
IV B.Tech I Semester Examinations,May 2011 ADVANCED FOUNDATION ENGINEERING Civil Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Explain the various approaches available to estimate the load carrying capacity of pile.
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(b) A group of 16 piles 9 m long is used as foundation for a column. The piles used are 300 mm in diameter with centre to centre spacing of 0.9 m. The subsoil consists of pure clay with c = 75 kPa. Estimate the capacity of pile group. [8+8]
or
2. (a) What are the various approaches to determine the settlement of foundation on cohesionless soil?
uW
(b) A footing for a water tower carries a load of 9000 kN and is 3.6 meters square. It rests on dense sand of 9 m thickness overlying a clay layer of 3 m depth. The clay layer overlies hard rock. The clay liquid limit = 50%, natural water content = 40.5%, and G = 2.70. The saturated unit weight is 18.9 kN/m3 . Estimate the ultimate settlement due to consolidation of the clay layer, assuming the site to be flooded. [8+8]
3. Compute the embedment depth for a 6m high cantilever pile supporting 4m high water above the dredge line. The soil of the backfill and that below the dredge line is the same, having the following properties: γsat = 22 kN/m3 and φ = 300 . Determine the depth of embedment of the sheetpile if the soil below the dredge line has the following properties.γsat =19 kN/m3 , C = 45 kN/m2 and φ = 00 [16]
nt
4. A vertical retaining wall is 5.5 m high with a horizontal backfill. For the backfill, γ = 19 kN/m3 φ0 = 220 , and C0 = 10kN/m3 . Determine the Rankine’s passive force per unit length of the wall. Also find its location and direction. [16] 5. Write in detail about design of foundations on expansive soils.
[16]
Aj
6. (a) Explain the evaluation of settlement of group of piles in sand from field tests on single pile. (b) A concrete pile 450 mm diameter and 15 m length is installed in a depth of sand. Its coefficient of subgrade reaction nh = 10×106 N/m3 . Find the deflection of the pile head considering it as a free pile under a horizontal force of 30 kN. Assume E value of concrete as 20 kN/mm2 . [8+8]
7. (a) Check the stability of a floating caisson 10.0m high and having a rectangular base 20 m × 9 m. The weight of the caisson is 8 MN and its centre of gravity is 4.0 m above the base. If the caisson is unstable, how would you make it stable? Take unit weight of water as 10.25 kN/m2 . 1
Code No: R05410107
R05
Set No. 2
(b) What is maximum pressure on the soil when the caisson has been fully installed? The base is at a depth of 9 m below the water level. The total weight is 51 MN, which acts at an eccentricity of 0.1 m. [8+8] 8. (a) Explain the Brinch Hansen’s bearing capacity theory .
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(b) Compute the ultimate load that an eccentrically loaded square footing of width 2.1 m with an eccentricity of 0.35 m can take at a depth of 0.5 m in a soil with c = 9 kN/m2 , φ = 360 , and γ = 18 kN/m3 , Nc = 52, Nq = 35, and Nγ = 42. [6+10]
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or
ld .
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2
Code No: R05410107
R05
Set No. 4
in
IV B.Tech I Semester Examinations,May 2011 ADVANCED FOUNDATION ENGINEERING Civil Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Explain the various approaches available to estimate the load carrying capacity of pile.
ld .
(b) A group of 16 piles 9 m long is used as foundation for a column. The piles used are 300 mm in diameter with centre to centre spacing of 0.9 m. The subsoil consists of pure clay with c = 75 kPa. Estimate the capacity of pile group. [8+8]
or
2. Compute the embedment depth for a 6m high cantilever pile supporting 4m high water above the dredge line. The soil of the backfill and that below the dredge line is the same, having the following properties: γsat = 22 kN/m3 and φ = 300 . Determine the depth of embedment of the sheetpile if the soil below the dredge line has the following properties.γsat =19 kN/m3 , C = 45 kN/m2 and φ = 00 [16]
uW
3. (a) Check the stability of a floating caisson 10.0m high and having a rectangular base 20 m × 9 m. The weight of the caisson is 8 MN and its centre of gravity is 4.0 m above the base. If the caisson is unstable, how would you make it stable? Take unit weight of water as 10.25 kN/m2 . (b) What is maximum pressure on the soil when the caisson has been fully installed? The base is at a depth of 9 m below the water level. The total weight is 51 MN, which acts at an eccentricity of 0.1 m. [8+8] 4. (a) Explain the Brinch Hansen’s bearing capacity theory .
nt
(b) Compute the ultimate load that an eccentrically loaded square footing of width 2.1 m with an eccentricity of 0.35 m can take at a depth of 0.5 m in a soil with c = 9 kN/m2 , φ = 360 , and γ = 18 kN/m3 , Nc = 52, Nq = 35, and Nγ = 42. [6+10]
Aj
5. (a) Explain the evaluation of settlement of group of piles in sand from field tests on single pile. (b) A concrete pile 450 mm diameter and 15 m length is installed in a depth of sand. Its coefficient of subgrade reaction nh = 10×106 N/m3 . Find the deflection of the pile head considering it as a free pile under a horizontal force of 30 kN. Assume E value of concrete as 20 kN/mm2 . [8+8]
6. (a) What are the various approaches to determine the settlement of foundation on cohesionless soil?
3
Code No: R05410107
R05
Set No. 4
(b) A footing for a water tower carries a load of 9000 kN and is 3.6 meters square. It rests on dense sand of 9 m thickness overlying a clay layer of 3m depth. The clay layer overlies hard rock. The clay liquid limit = 50%, natural water content = 40.5%, and G = 2.70. The saturated unit weight is 18.9 kN/m3 . Estimate the ultimate settlement due to consolidation of the clay layer, assuming the site to be flooded. [8+8] [16]
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7. Write in detail about design of foundations on expansive soils.
Aj
nt
uW
or
?????
ld .
8. A vertical retaining wall is 5.5 m high with a horizontal backfill. For the backfill, γ = 19 kN/m3 φ0 = 220 , and C0 = 10kN/m3 . Determine the Rankine’s passive force per unit length of the wall. Also find its location and direction. [16]
4
Code No: R05410107
R05
Set No. 1
in
IV B.Tech I Semester Examinations,May 2011 ADVANCED FOUNDATION ENGINEERING Civil Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Explain the various approaches available to estimate the load carrying capacity of pile.
ld .
(b) A group of 16 piles 9 m long is used as foundation for a column. The piles used are 300 mm in diameter with centre to centre spacing of 0.9 m. The subsoil consists of pure clay with c = 75 kPa. Estimate the capacity of pile group. [8+8]
or
2. (a) Check the stability of a floating caisson 10.0m high and having a rectangular base 20 m × 9 m. The weight of the caisson is 8 MN and its centre of gravity is 4.0 m above the base. If the caisson is unstable, how would you make it stable? Take unit weight of water as 10.25 kN/m2 .
uW
(b) What is maximum pressure on the soil when the caisson has been fully installed? The base is at a depth of 9 m below the water level. The total weight is 51 MN, which acts at an eccentricity of 0.1 m. [8+8] 3. Write in detail about design of foundations on expansive soils.
[16]
4. Compute the embedment depth for a 6m high cantilever pile supporting 4m high water above the dredge line. The soil of the backfill and that below the dredge line is the same, having the following properties: γsat = 22 kN/m3 and φ = 300 . Determine the depth of embedment of the sheetpile if the soil below the dredge line has the following properties.γsat =19 kN/m3 , C = 45 kN/m2 and φ = 00 [16]
nt
5. (a) What are the various approaches to determine the settlement of foundation on cohesionless soil?
Aj
(b) A footing for a water tower carries a load of 9000 kN and is 3.6 meters square. It rests on dense sand of 9 m thickness overlying a clay layer of 3m depth. The clay layer overlies hard rock. The clay liquid limit = 50%, natural water content = 40.5%, and G = 2.70. The saturated unit weight is 18.9 kN/m3 . Estimate the ultimate settlement due to consolidation of the clay layer, assuming the site to be flooded. [8+8]
6. (a) Explain the Brinch Hansen’s bearing capacity theory . (b) Compute the ultimate load that an eccentrically loaded square footing of width 2.1 m with an eccentricity of 0.35 m can take at a depth of 0.5 m in a soil with c = 9 kN/m2 , φ = 360 , and γ = 18 kN/m3 , Nc = 52, Nq = 35, and Nγ = 42. [6+10]
5
Code No: R05410107
R05
Set No. 1
7. A vertical retaining wall is 5.5 m high with a horizontal backfill. For the backfill, γ = 19 kN/m3 φ0 = 220 , and C0 = 10kN/m3 . Determine the Rankine’s passive force per unit length of the wall. Also find its location and direction. [16] 8. (a) Explain the evaluation of settlement of group of piles in sand from field tests on single pile.
Aj
nt
uW
or
?????
ld .
in
(b) A concrete pile 450 mm diameter and 15 m length is installed in a depth of sand. Its coefficient of subgrade reaction nh = 10×106 N/m3 . Find the deflection of the pile head considering it as a free pile under a horizontal force of 30 kN. Assume E value of concrete as 20 kN/mm2 . [8+8]
6
Code No: R05410107
R05
Set No. 3
in
IV B.Tech I Semester Examinations,May 2011 ADVANCED FOUNDATION ENGINEERING Civil Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
ld .
1. Compute the embedment depth for a 6m high cantilever pile supporting 4m high water above the dredge line. The soil of the backfill and that below the dredge line is the same, having the following properties: γsat = 22 kN/m3 and φ = 300 . Determine the depth of embedment of the sheetpile if the soil below the dredge line has the following properties.γsat =19 kN/m3 , C = 45 kN/m2 and φ = 00 [16] 2. (a) Explain the various approaches available to estimate the load carrying capacity of pile.
or
(b) A group of 16 piles 9 m long is used as foundation for a column. The piles used are 300 mm in diameter with centre to centre spacing of 0.9 m. The subsoil consists of pure clay with c = 75 kPa. Estimate the capacity of pile group. [8+8]
uW
3. A vertical retaining wall is 5.5 m high with a horizontal backfill. For the backfill, γ = 19 kN/m3 φ0 = 220 , and C0 = 10kN/m3 . Determine the Rankine’s passive force per unit length of the wall. Also find its location and direction. [16]
4. Write in detail about design of foundations on expansive soils.
[16]
5. (a) What are the various approaches to determine the settlement of foundation on cohesionless soil?
nt
(b) A footing for a water tower carries a load of 9000 kN and is 3.6 meters square. It rests on dense sand of 9 m thickness overlying a clay layer of 3 m depth. The clay layer overlies hard rock. The clay liquid limit = 50%, natural water content = 40.5%, and G = 2.70. The saturated unit weight is 18.9 kN/m3 . Estimate the ultimate settlement due to consolidation of the clay layer, assuming the site to be flooded. [8+8]
Aj
6. (a) Check the stability of a floating caisson 10.0m high and having a rectangular base 20 m × 9 m. The weight of the caisson is 8 MN and its centre of gravity is 4.0 m above the base. If the caisson is unstable, how would you make it stable? Take unit weight of water as 10.25 kN/m2 . (b) What is maximum pressure on the soil when the caisson has been fully installed? The base is at a depth of 9 m below the water level. The total weight is 51 MN, which acts at an eccentricity of 0.1 m. [8+8]
7. (a) Explain the Brinch Hansen’s bearing capacity theory .
7
Code No: R05410107
R05
Set No. 3
(b) Compute the ultimate load that an eccentrically loaded square footing of width 2.1 m with an eccentricity of 0.35 m can take at a depth of 0.5 m in a soil with c = 9 kN/m2 , φ = 360 , and γ = 18 kN/m3 , Nc = 52, Nq = 35, and Nγ = 42. [6+10]
in
8. (a) Explain the evaluation of settlement of group of piles in sand from field tests on single pile.
Aj
nt
uW
or
?????
ld .
(b) A concrete pile 450 mm diameter and 15 m length is installed in a depth of sand. Its coefficient of subgrade reaction nh = 10×106 N/m3 . Find the deflection of the pile head considering it as a free pile under a horizontal force of 30 kN. Assume E value of concrete as 20 kN/mm2 . [8+8]
8
