Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 12, Problem 12.23P
To determine
Find the allowable lateral load
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A 30-m-long concrete pile is 305 mm x 305 mm in cross section and is fully embedded in a sand deposit. If nh = 9200 kN/m2, the moment at ground level, Mg = 0, the allowable displacement of pile head = 12 mm; Ep = 21 x 106 kN/m2; and FY (pile) = 21,000 kN/m2, calculate the allowable lateral load, Qg, at the ground level. Use the elastic solution method.
Evaluate the resisting capacity against axial
load due skin friction of a concrete pile
embedded into a layer of plastic clay given in
the following conditions:
Size of pile = 0.4 m square
Depth of penetratian inta the clay layer = 40 m
Unconfined compression strength (qu) af the
clay = 200 KPa
Ans. 6400 kN
A concrete bored pile has a diameter of 800 mm as given in the figure
below. Calculate the ultimate load carrying capacity of the pile.
-0.8-
Clay
Cu = 60 kN/m²
Y = 18 kN/m³
%3D
4m
G.W.T
Sand
6m
$ = 30°
Y = 20 kN/m³
Clay
Cu = 100 kN/m²
Y = 20 kN/m³
5m
Chapter 12 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 12 - Prob. 12.1PCh. 12 - A 20 m long concrete pile is shown in Figure...Ch. 12 - A 500 mm diameter are 20 m long concrete pile is...Ch. 12 - Redo Problem 12.3 using Coyle and Castellos...Ch. 12 - A 400 mm 400 mm square precast concrete pile of...Ch. 12 - Determine the maximum load that can be allowed on...Ch. 12 - A driven closed-ended pile, circular in cross...Ch. 12 - Consider a 500 mm diameter pile having a length of...Ch. 12 - Determine the maximum load that can be allowed on...Ch. 12 - Prob. 12.10P
Ch. 12 - Prob. 12.11PCh. 12 - Prob. 12.12PCh. 12 - A concrete pile 16 in. 16 in. in cross section is...Ch. 12 - Prob. 12.14PCh. 12 - Solve Problem 12.13 using Eqs. (12.59) and...Ch. 12 - Prob. 12.16PCh. 12 - Prob. 12.17PCh. 12 - A steel pile (H-section; HP 310 125; see Table...Ch. 12 - Prob. 12.19PCh. 12 - A 600 mm diameter and 25 m long driven concrete...Ch. 12 - Redo Problem 12.20 using Vesics method, assuming...Ch. 12 - Prob. 12.22PCh. 12 - Prob. 12.23PCh. 12 - Solve Problem 12.23 using the method of Broms....Ch. 12 - Prob. 12.25PCh. 12 - Solve Problem 12.25 using the modified EN formula....Ch. 12 - Solve Problem 12.25 using the modified Danish...Ch. 12 - Prob. 12.28PCh. 12 - Prob. 12.29PCh. 12 - Figure 12.49a shows a pile. Let L = 15 m, D (pile...Ch. 12 - Redo Problem 12.30 assuming that the water table...Ch. 12 - Refer to Figure 12.49b. Let L = 18 m, fill = 17...Ch. 12 - Estimate the group efficiency of a 4 6 pile...Ch. 12 - The plan of a group pile is shown in Figure...Ch. 12 - Prob. 12.35PCh. 12 - Figure P12.36 shows a 3 5 pile group consisting...Ch. 12 - Prob. 12.37P
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- FDE 016: A prestressed concrete pile, 400 mm x 400 mm in cross-section, is to be driven in a clayey soil as shown. Use alpha method with factor of safety of 2. Soft Clay 17-15.7 kN/m² c=32 kPa 8 m Stiff Clay * = 19 kN/m² Cu = 90 kPa = 0.5 Refer to FDE 016. What is the end bearing capacity of pile in KN? Select the correct response: 251.84 184.25 129.60 245.32 6 m.arrow_forwardA 20 m long concrete pile is shown in Figure P12.2. Estimate the ultimate point load Qp by a. Meyerhofs method b. Vesics method c. Coyle and Castellos method Use m = 600 in Eq. (12.28).arrow_forwardRefer 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)]arrow_forward
- A steel pile (H-section; HP 360 1.491; see Table 18.1) is driven into a layer of sandstone The length of the pile is 18.9 m. Following are the properties of the sandstone: Unconfined compression strength = qu(lab) = 78.7 MN/m2 Angle of friction = 36 Using a factor of safety of 3, estimate the allowable point load that can be carried by the pile. Use Eq. (18.42).arrow_forwardA square pile group of 16 piles penetrates through a filled up soil of 3 m depth. The pile diameter is 250 mm and pile spacing is 0.75 m. The unit cohesion of the material is 18 kN/m² and the unit weight of the soil is 15 kN/m². Compute the drag down force on the group.arrow_forwardA frictional pile with a circular cross-section (diameter = D) is pushed into the soil %3D to a distance (L) and then it is subjected to an axial force (P) on its top end. Derive a formula to calculate the normal stress in any section x. P xx f N/mm2arrow_forward
- 11.22 A concrete pile measuring 0.406 m X 0.406 m in cross section is 18.3 m long. It is fully embedded in a layer of sand. The following is an approximation of the me- chanical cone penetration resistance (q.) and the friction ratio (F) for the sand layer. Estimate the allowable bearing capacity of the pile. Use FS = 4. Depth below ground surface (m) 9. (kN/m²) F, (%) 0-6.1 2803 2.3 6.1-13.7 3747 2.7 13.7-19.8 8055 2.8arrow_forwardA 10m long and 0.8m diameter precast concrete pile is driven into a saturated clay deposit as shown in the figure below. The groundwater table is at the ground surface. For the ratio of the undrained shear strength to vertical effective pressure is approximated as follows: = 0.11 + 0.0037(PI) NC (9- 9 (OCR)8 OC Determine the bearing capacity for the pile by the a) Alpha (a) method. b) Lambda (A) method Depth, m Layer 1 OCR = 5, Yat = 19.5 kN/m³, Pl = 35 Layer 2 OCR = 1.5, %at = 19.0 kN/m, Pl = 25 Layer 3 OCR = 8, %at = 19.5 kN/m, Pl = 20 10 D, = 0.8 m D 10 marrow_forwardQ2. A concrete pile 400 mm. X 400 mm in cross section is shown in figure below. Calculate the ultimate skin friction resistance by using the a method and Point Bearing Capacity, Q, by using Vesic's Method. Estimate the allowable load-carrying capacity using FS = 4 Silty clay Ysat = 118 lb/ft³ Cu1 Plasticity index, PI = 15 Groundwater "table: . Silty clay Ysat = 122.4 1b/ft³ L Cu2 Plasticity index, PI = 20 300 mm Given Data: DI L Cu2 Cui 4 14 50 62arrow_forward
- A concrete pile 20 m long having a cross section of 0.46 m × 0.46 m is fully embedded in a saturated clay layer. For the clay, given: Yat = 18 kN/m², = 0, and Cu = 80 kN/m?. Determine the allowable load that the pile can carry (FS = 3). Use %3D the A method to estimate the skin resistance.arrow_forwardQUESTION 3 A concrete pile is driven into top two layers of subsoil strata made of 10m and 5m thick saturated clays respectively. The pile's diameter is 500 mm throughout the pile. Determine the allowable bearing capacity of the pile. The subsoil properties are shown. (Answer 454 kN). Clay layer 1: Saturated unit weight of clay = 18kN/m3 Average undrained shear strength = 100kPa, o = 0 %3D Adhesion factor = 0.48 Clay layer 2: Saturated unit weight of clay = 19kN/m3 Average undrained shear strength = 120kPa, q = 0 Adhesion factor = 0.42, Nc = 9.arrow_forwardA 450 mm x 450 mm concrete pile 20.0 m long is driven into sand deposits with y = 17 kN/m³ and = 30°. Find the ultimate load i.e. point load Qp by Meyerhoff's method and Janbu method. Meyerhoff's N = 55, Atmospheric pressure = 100 kN/m², Janbu's N = 18.4arrow_forward
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