(b) A similar pile will be installed in a pile group of n by n piles, as shown in the figure below.Determine the necessary number of piles in the group if their spacing S, from center to center,is 2B. Calculate the capacity of the pile group as that of a deep square foundation, withcontributions from both the base and the sides, considering that the efficiency of each pile is 0.7when the pile group fails. Consider the depth factor dc = 1.0 and shape factor sc = 1+ 0.2B/L.☐0.5m☐S☐Sn-pilesS☐☐☐☐☐☐☐☐பSSཅིS++n-piles

Answered: (b) A similar pile will be installed in…

Principles of Foundation Engineering (MindTap Course List)

8th Edition

ISBN:9781305081550

Author:Braja M. Das

Publisher:Braja M. Das

Chapter9: Pile Foundations

Section: Chapter Questions

Problem 9.2P: Refer to the pile shown in Figure P9.1. Estimate the side resistance Qs by Using Eqs. (9.40) through...

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In a 16 (4 x4) piles group, the pile diameter is 0.4 m and center to center spacing of piles in the square group is 1.5 m. If C. = 50 kN/m², with neglecting the bearing at the tip of the pile, determine whether the failure would occur as block failure or when the piles act individually. The piles are 12 m long. Take α= 0.7 for shear mobilization around each pile. Also determine the safe load on this group assuming the factor of safety -2.5.
Refer to the pile shown in Figure P9.1. Estimate the side resistance Qs by Using Eqs. (9.40) through (9.42). Use K = 1.5 and Coyle and Castello’s method [Eq. (9.44)]
Figure 18.26a shows a pile. Let L = 20 m, D = 450 mm. Hf = 4m, f = 17.5 kN/m3, fill = 25. Determine the total downward drag force on the pile. Assume that the fill is located above the water table and that = 0.5 fill. FIG. 18.26 Negative skin friction
A 600 mm diameter and 25 m long driven concrete pile carries a column load of 1200 kN. It is estimated that the shaft carries 900 kN and the point carries 300 kN. Determine the settlement of the pile head using the Poulos and Davis method with the following data: Es = 25 MN/m2, Ep = 30,000 MN/m2, and s = 0.2
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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
1. A 3 X 4 group pile that are square in cross section (356 mm x 356 mm) as shown in the figure. The center-to-center spacing, d, of the piles is 889 mm. If a ₁ = 0.68, a 2 = 0.51. Assume the piles act individually. Determine the ultimate load-bearing capacity of the pile group. G.W.T 4.57 m 13.72 m Clay "=50.3 kN/m² Y17.6 kN/m³ Clay C=85.1 kN/m² Y 19.02 kN/m T 889 mm
QUESTION 3: Three forces act on a pile as shown. If the resultant of the three forces is equal to 500 N and is directed vertically, what is the magnitude and direction of F3. F2= 100 N F3 F,= 75 N 35° 40° Pile (Answer: F3=365 N, E=76.8°)
o Given: A earth pile with L, E, and A known and constant F Y X (L-x) steel pile soil f = force/length o Find: The total deformation, A, of the pile.
The plan of a group pile is shown in the figure. Assume that the piles areembedded in a saturated homogeneous clay having a cu=90 kN/m2 . Given: Diameter of piles (D)=316 mm, center-to-center spacing of piles=600 mm, and length of piles= 20 m. Find the allowable load-carrying capacity of the pile group. Using FS=3 and table.
The soil profile and soil properties at a site are shown in the table below. A group of 12 concrete piles in a 3 x 4 matrix and of length 12 m is used to support a load. The pile diameter is 0.45 m and pile spacing is 1.5 m.Determine the allowable load capacity for a factor of safety of 2. Calculate the total settlement (elastic and consolidation) under the allowable load. Assume Ep = 20 x 106 kPa.
Calculate the safe bearing capacity of the square-section concrete fired puller, whose dimensions and soil properties are given in the figure (FS = 3). If the same pile is formed as a group of 4x4, calculate the safe bearing capacity of the pile group. pile spacing is s = 2.5 m.

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