The plan of a group pile is shown in the Figure below. Assume that the piles areembedded in a saturated homogeneous clay having a c, = 86 kN/m?. Given:diameter of piles (D) = 316 mm, center-to-center spacing of piles d = 790 mm, andlength of piles = 20 m. Find the allowable load-carrying capacity of the pile group.Use FS = 3. (pa100 kPa)Qu1) = n,n: [94,0(2) +Ea'pc,AL|Q.e) = L,B,CN+E2(L, + B, )e,ALu(p) 'cIf Qu(1) < Qu@), then Q, = Qu)7Number of piles in group: n,×n2D7 =1–7, (n, – 1) + n, (n, – 1)+ vZ (n – 1)(n, – 1)|adn,n,Table 11.10 Variation of a (interpo-lated values based on Terzaghi, Peckand Mesri, 1996)LJB, = 18Cu7Pa< 0.10.21.0060.920.30.820.40.740.60.624T0.80.543451.00.48

Procedure to find the allowable load-bearing capacity of pile group: Calculate the ratio of CuPa.…

The plan of a group pile is shown in the Figure below. Assume that the piles are embedded in a saturated homogeneous clay having a c, = 86 kN/m?. Given: diameter of piles (D) = 316 mm, center-to-center spacing of piles d = 790 mm, and length of piles = 20 m. Find the allowable load-carrying capacity of the pile group. Use FS = 3. (p, = 100 kPa) %3D Qu1) = n,n;|94,6|(p) + Ea'pe,AL| p°u(p) Que) = L,B,Cup,N; +D?(L, +B,)c¸AL If Ou) < Qu2), then Q, = Quay7 Number of piles in group: n¡Xn2 D 7 =1– , (n, – 1) + n, (n, – 1)+ /2 (n, – 1)(n, – 1)]| ndn,n, - Table 11.10 Variation of a (interpo- LJB, = 1 lated values based on Terzaghi, Peck and Mesri, 1996) 8 Cu 7 Pa < 0.1 0.2 1.00 6. 0.92 0.3 0.82 0.4 0.74 0.6 0.62 4 T T 0.8 0.54 2 3 4 1.0 0.48 LIB,

The plan of a group pile is shown in the Figure below. Assume that the piles are embedded in a saturated homogeneous clay having a c, = 86 kN/m?. Given: diameter of piles (D) = 316 mm, center-to-center spacing of piles d = 790 mm, and length of piles = 20 m. Find the allowable load-carrying capacity of the pile group. Use FS = 3. (p, = 100 kPa) %3D Qu1) = n,n;|94,6|(p) + Ea'pe,AL| p°u(p) Que) = L,B,Cup,N; +D?(L, +B,)c¸AL If Ou) < Qu2), then Q, = Quay7 Number of piles in group: n¡Xn2 D 7 =1– , (n, – 1) + n, (n, – 1)+ /2 (n, – 1)(n, – 1)]| ndn,n, - Table 11.10 Variation of a (interpo- LJB, = 1 lated values based on Terzaghi, Peck and Mesri, 1996) 8 Cu 7 Pa < 0.1 0.2 1.00 6. 0.92 0.3 0.82 0.4 0.74 0.6 0.62 4 T T 0.8 0.54 2 3 4 1.0 0.48 LIB,

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Backfill, in construction, is the activity of returning the soil and gravel that are removed during building construction or using them again to toughen and support the foundation of the building or any other structural component.

Question

The plan of a group pile is shown in the Figure below. Assume that the piles are
embedded in a saturated homogeneous clay having a c, = 86 kN/m?. Given:
diameter of piles (D) = 316 mm, center-to-center spacing of piles d = 790 mm, and
length of piles = 20 m. Find the allowable load-carrying capacity of the pile group.
Use FS = 3. (pa
100 kPa)
Qu1) = n,n: [94,0(2) +Ea'pc,AL|
Q.e) = L,B,CN+E2(L, + B, )e,AL
u(p) 'c
If Qu(1) < Qu@), then Q, = Qu)7
Number of piles in group: n,×n2
D
7 =1–
7, (n, – 1) + n, (n, – 1)+ vZ (n – 1)(n, – 1)|
adn,n,
Table 11.10 Variation of a (interpo-
lated values based on Terzaghi, Peck
and Mesri, 1996)
LJB, = 1
8
Cu
7
Pa
< 0.1
0.2
1.00
6
0.92
0.3
0.82
0.4
0.74
0.6
0.62
4
T
0.8
0.54
3
4
5
1.0
0.48

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