Figure below shows a precast circular pile is driven into two clay stratums to a depth of 14 m. the soil undrained shear strength properties are shown in the figure. Determine the size of the pile if the allowable load for this pile and the factor of safety is 99 kN and 2.5 respectively. (Take a as 1) 12 m 8 m Ground level Figuro at Om c= 30 kN/m² at 12m → cu = 30 kN/m² at 20mc₁ = 75 kN/m²

Figure below shows a precast circular pile is driven into two clay stratums to a depth of 14 m. the soil undrained shear strength properties are shown in the figure. Determine the size of the pile if the allowable load for this pile and the factor of safety is 99 kN and 2.5 respectively. (Take a as 1) 12 m 8 m Ground level Figuro at Om c= 30 kN/m² at 12m → cu = 30 kN/m² at 20mc₁ = 75 kN/m²

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter12: Pile Foundations

Section: Chapter Questions

Problem 12.36P: Figure P12.36 shows a 3 5 pile group consisting of 15 concrete piles of 400 mm diameter and 12 m in...

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Redo Problem 18.10 using the method for estimating the skin resistance. 18.10 A concrete pile 15 m long with a cross section of 380 mm 380 mm is fully embedded in a saturated clay layer. For the clay, sat = 18 kN/m3, = 0, and cu = 80 kN/m2. Assume that the water table lies below the tip of the pile. Determine the allowable load that the pile can carry (FS = 3). Use the a method to estimate the skin resistance.
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)]
Redo Problem 12.30 assuming that the water table coincides with the top of the fill and that sat(fill) = 19.8 kN/m3. If the other quantities remain the same, what would be the downward drag force on the pile? Assume ' = 0.5fill. 12.30 Figure 12.49a shows a pile. Let L = 15 m, D (pile diameter) 305 mm, Hf = 3 m, fill = 17.5 kN/m3, and fill = 25°. Determine the total downward drag force on the pile. Assume that the fill is located above the water table and that = 0.5fill.
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).
Redo Problem 12.20 using Vesics method, assuming that the skin friction is distributed uniformly along the shaft. 12.20 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
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.
Determine the maximum load that can be allowed on the 450 mm diameter pile shown in Figure 18.36, with a safety factor of 3. Use the a method for computing the shaft friction. FIG. 18.36
Solve Problem 12.23 using the method of Broms. Assume that the pile is flexible and free headed. Let the soil unit weight, = 16 kN/m3; the soil friction angle, = 30; and the yield stress of the pile material. FY = 21 MN/m2. 12.23 A 30 m long concrete pile is 305 mm 305 mm in cross section and is fully embedded in a sand dcposit. If nh = 9200 kN/m2, the moment at ground level Mg = 0, the allowable displacement of pile head = 12 mm; Ep = 21 106 kN/m2, and FY(pile) = 21,000 kN/m2, calculate the allowable lateral load, Qg, at the ground level. Use the elastic solution method.