12.36 Figure P12.36 shows a 3× 5 pile group consisting of 15 concrete piles of 400 mm diameter and 12 m in length. What would be the maximum load that can be allowed on the mat with a factor of safety of 3? The piles have a center- to-center spacing of 1200 mm. Qall = ? Clay Cu= 60 kN/m² 5 m 7 m Clay Cu= 90 kN/m² FIGURE P12.36

12.36 Figure P12.36 shows a 3× 5 pile group consisting of 15 concrete piles of 400 mm diameter and 12 m in length. What would be the maximum load that can be allowed on the mat with a factor of safety of 3? The piles have a center- to-center spacing of 1200 mm. Qall = ? Clay Cu= 60 kN/m² 5 m 7 m Clay Cu= 90 kN/m² FIGURE P12.36

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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Q: The following figure shows the flownet for seepage of water around a single row of sheet piles driven into permeable layer. Calculate the factor of safety against downstream heave, given that Ysat = 19 kN/m³ and yw = 9.81 kN/m³. All the relevant information are provided in the figure. HI-10m 6m ↓ Heave zone Sheet pile Impermeable layer H₂= 2 m Y-16 kN/m
12.10 A concrete pile 15.24 m long having a cross section of 406 mm × 406 mm is fully embedded in a saturated clay layer for which Ysat = 19.02 kN/m³, p = 0, and c₂ = 76.7 kN/m². Determine the allowable load that the pile can carry. (Let FS = 3.) Use the a method Eq. (12.61) and Table 12.11 to estimate the skin friction and Vesic's method for point load estimation.
Question 18 Nine-pile group consist of 0.36-meter-diameter friction concrete piles 20 m long arranged in 3 rows by 3 columns. The piles are driven into clay having unconfined compressive strength of 147 kPa. The spacing of piles is 0.68 m. on-center. Adhesion factor of the piles is α = 0.53. Determine the allowable block capacity (in kN) of the piile group based on the arrangement described. Use FS = 2.75. Round off to two decimal places.
7. If a 45 cm diameter pipe pile is driven into clayey soil to a depth of 12 m. (a) what would the allowable load capacity (Q) be? The water table is 2 m below the ground surface and the soil profile consists of two clay layers (refer to the figure below). Use the ß method to calculate skin friction and the R=30° for all clay layers. (b) Explain how you selected FS value you use. 12 m ▶ 9m 2m 45 cm Y = 18.5kN/m³ = 30kN/m² Ysat = 19kN/m³ C₂ = 30kN/m² Ysat = 20kN/m² S = 60kN/m²
A 20-m-long concrete pile is shown in Figure P9.1. Estimate the ultimate point load Q, by a. Meyerhof's method b. Vesic's method c. Coyle and Castello's method Use m = 600 in Eq. (9.26). 9.1 Concrete pile 460 mm x 460 mm Loose sand di = 30° y = 18.6 kN/m3 20 m Dense sand d'2 = 42° y = 18.5 kN/m3 Figure P9.1
Problem 2 6m m 3m 0.75m 0.75m sharon 0.75m 0.75m C=42.81 kpe 0.85 C-57.40 kpa a=0.75 C-95.76 kpa a=0.5 No = 8 A nine-pile group composed of 0.30m diameter pipe piles is embedded 15m in clay soil with conditions indicated by the sketch. Determine the following: a. Capacity if piles acting individually b. Total capacity if piles act as a group c. Design load if factor of safety is 3.
Q2: The plan of a group piles is shown below. Assume that the piles are embedded in a saturated homogeneous clay having a 7sa= 19.24 kN/m, C=41.2 kN/m? .Given: diameter of piles (D) = 305 mm, center-to-center spacing of piles 762 mm, and length of piles = 13.7 m. Find the allowable load-carrying capacity of the pile group. Use FS = 3. P
3. A concrete pile 15.24 m long having a cross section of 406 mm × 406 mm is fully embedded in a saturated clay layer for which Ysat 19.02 kN/m³, Ø = 0, and cu=76.7 kN/m². Determine the allowable load that the pile can carry (Assuming FS-3). Use the a method to estimate the skin friction and Vesic's method for point load estimation.
1. Refer the Fig. 1. Estimate the side resistance Qs by a. Meyerhof's method. K= 1.5 and d'= 0.6 Ø Coyle and Castello's method b. Concrete pile 460 mm x 450 mm I Loose sand 20 m 0', -30° Y=18.6 kN/m³ TE Dense sand 0₂-42* Y-18 6 kN/m² Fig. 1
Nine-pile group consist of 0.21-meter-diameter friction concrete piles 24 m long arranged in 3 rows by 3 columns. The piles are driven into clay having unconfined compressive strength of 100 kPa. The spacing of piles is 0.66 m. on-center. Adhesion factor of the piles is α = 0.77. Determine the allowable block capacity (in kN) of the piile group based on the arrangement described. Use FS = 3.33.
Nine-pile group consist of 0.37-meter-diameter friction concrete piles 20 m long arranged in 3 rows by 3 columns. The piles are driven into clay having unconfined compressive strength of 121 kPa. The spacing of piles is 0.68 m. on-center. Adhesion factor of the piles is a = 0.78. Determine the allowable block capacity (in kN) of the piile group based on the arrangement described. Use FS = 3.49. Round off to two decimal places.
Q6) Find the ultimate compressive (Qu) and pullout (Tu) capacities of the driven closed-end steel pipe-pile shown in Fig. (6). Given data: outer diameter = 610 mm weight of empty pipe = 186.8 kg/m a = 1 for cu ≤ 25 kPa ぬ。 34 35 36 Disp. Piles 41.3 49.9 60.9 Cu = 12 kN/m² Ysat = 16 kN/m³ Cu = 50 kN/m² Ysat = 18 kN/m³ c=0 Cu = 100 kN/m² Ysat = 20 kN/m³ = 35° Ysat = 20 kN/m³ 3 wall thickness = 12.7 mm pile to be filled with concrete. α = 0.5 for c₂ ≥ 75 kPa No Non-disp. Piles Fig. (6) 20.3 24.6 30.1 W.T. - Ans.: Qu= 4165 kN, T₂ = 1696 kN 6 m 4.5 m 4.5 m 6 m