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A square pile group of 9 piles having depth of 9 m passes through a recently filled up material of 4.5 m depth. The diameter of the pile is 30 cm and pile spacing is 60 cm centre to centre. If the unconfined compressive strength of the cohesive material is 60 kN/m2 and unit weight is 15 kN/m3, the negative skin friction of the pile group is ________ kN.
- a)1145.11
- b)1146.34
- c)1147.48
- d)1150.67
Correct answer is option 'A'. Can you explain this answer?
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A square pile group of 9 piles having depth of 9 m passes through a re...
D' = Depth of soil fill = 4.5 m Individual piles:
Negative skin friction, Qng = n x PD'c
= 9 x π x 0.3 x 4.5 x 30 =1145.11 kN
Pile group: B = 2S + d
=2x0.6+0.3=1.5m
Perimeter = 4B = 6m
Area = B2 = 2.25 m2
Negative skin friction,
= 30 X 4.5 X 6 + 15 X 4.5 X 2.25
= 810 + 151.875
= 961.875 kN .
Negative skin friction (the larger of the two values) = 1145.11 kN
Negative skin friction, Qng = n x PD'c
= 9 x π x 0.3 x 4.5 x 30 =1145.11 kN
Pile group: B = 2S + d
=2x0.6+0.3=1.5m
Perimeter = 4B = 6m
Area = B2 = 2.25 m2
Negative skin friction,
= 30 X 4.5 X 6 + 15 X 4.5 X 2.25
= 810 + 151.875
= 961.875 kN .
Negative skin friction (the larger of the two values) = 1145.11 kN
Most Upvoted Answer
A square pile group of 9 piles having depth of 9 m passes through a re...
Given data:
Depth of pile group = 9 m
Depth of filled material = 4.5 m
Diameter of pile = 30 cm
Pile spacing = 60 cm
Unconfined compressive strength = 60 kN/m2
Unit weight = 15 kN/m3
To find: Negative skin friction of the pile group
Calculation:
1. Area of one pile = πd2/4 = 0.7069 m2
2. Total area of pile group = 9 × 0.7069 = 6.3621 m2
3. Volume of filled material = 6.3621 × 4.5 = 28.62945 m3
4. Weight of filled material = 28.62945 × 15 = 429.44175 kN
5. Frictional resistance of pile = qu × Ap
Where,
qu = unconfined compressive strength of soil
Ap = perimeter of pile × depth of soil
Perimeter of pile = πd = 0.9425 m
Depth of soil = 4.5 m
So, Ap = 4.24125 m2
Frictional resistance of pile = 60 × 4.24125 = 254.475 kN
6. Negative skin friction of pile group = Frictional resistance of pile × Total area of pile group
= 254.475 × 6.3621
= 1145.114 kN (approx)
Therefore, the negative skin friction of the pile group is 1145.11 kN (approx).
Depth of pile group = 9 m
Depth of filled material = 4.5 m
Diameter of pile = 30 cm
Pile spacing = 60 cm
Unconfined compressive strength = 60 kN/m2
Unit weight = 15 kN/m3
To find: Negative skin friction of the pile group
Calculation:
1. Area of one pile = πd2/4 = 0.7069 m2
2. Total area of pile group = 9 × 0.7069 = 6.3621 m2
3. Volume of filled material = 6.3621 × 4.5 = 28.62945 m3
4. Weight of filled material = 28.62945 × 15 = 429.44175 kN
5. Frictional resistance of pile = qu × Ap
Where,
qu = unconfined compressive strength of soil
Ap = perimeter of pile × depth of soil
Perimeter of pile = πd = 0.9425 m
Depth of soil = 4.5 m
So, Ap = 4.24125 m2
Frictional resistance of pile = 60 × 4.24125 = 254.475 kN
6. Negative skin friction of pile group = Frictional resistance of pile × Total area of pile group
= 254.475 × 6.3621
= 1145.114 kN (approx)
Therefore, the negative skin friction of the pile group is 1145.11 kN (approx).
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A square pile group of 9 piles having depth of 9 m passes through a recently filled up material of 4.5 m depth. The diameter of the pile is 30 cm and pile spacing is 60 cm centre to centre. If the unconfined compressive strength of the cohesive material is 60 kN/m2 and unit weight is 15 kN/m3, the negative skin friction of the pile group is ________ kN.a)1145.11b)1146.34c)1147.48d)1150.67Correct answer is option 'A'. Can you explain this answer?
Question Description
A square pile group of 9 piles having depth of 9 m passes through a recently filled up material of 4.5 m depth. The diameter of the pile is 30 cm and pile spacing is 60 cm centre to centre. If the unconfined compressive strength of the cohesive material is 60 kN/m2 and unit weight is 15 kN/m3, the negative skin friction of the pile group is ________ kN.a)1145.11b)1146.34c)1147.48d)1150.67Correct answer is option 'A'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about A square pile group of 9 piles having depth of 9 m passes through a recently filled up material of 4.5 m depth. The diameter of the pile is 30 cm and pile spacing is 60 cm centre to centre. If the unconfined compressive strength of the cohesive material is 60 kN/m2 and unit weight is 15 kN/m3, the negative skin friction of the pile group is ________ kN.a)1145.11b)1146.34c)1147.48d)1150.67Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A square pile group of 9 piles having depth of 9 m passes through a recently filled up material of 4.5 m depth. The diameter of the pile is 30 cm and pile spacing is 60 cm centre to centre. If the unconfined compressive strength of the cohesive material is 60 kN/m2 and unit weight is 15 kN/m3, the negative skin friction of the pile group is ________ kN.a)1145.11b)1146.34c)1147.48d)1150.67Correct answer is option 'A'. Can you explain this answer?.
A square pile group of 9 piles having depth of 9 m passes through a recently filled up material of 4.5 m depth. The diameter of the pile is 30 cm and pile spacing is 60 cm centre to centre. If the unconfined compressive strength of the cohesive material is 60 kN/m2 and unit weight is 15 kN/m3, the negative skin friction of the pile group is ________ kN.a)1145.11b)1146.34c)1147.48d)1150.67Correct answer is option 'A'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about A square pile group of 9 piles having depth of 9 m passes through a recently filled up material of 4.5 m depth. The diameter of the pile is 30 cm and pile spacing is 60 cm centre to centre. If the unconfined compressive strength of the cohesive material is 60 kN/m2 and unit weight is 15 kN/m3, the negative skin friction of the pile group is ________ kN.a)1145.11b)1146.34c)1147.48d)1150.67Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A square pile group of 9 piles having depth of 9 m passes through a recently filled up material of 4.5 m depth. The diameter of the pile is 30 cm and pile spacing is 60 cm centre to centre. If the unconfined compressive strength of the cohesive material is 60 kN/m2 and unit weight is 15 kN/m3, the negative skin friction of the pile group is ________ kN.a)1145.11b)1146.34c)1147.48d)1150.67Correct answer is option 'A'. Can you explain this answer?.
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