A concrete pile 65 ft long having a cross section of 15 in. × 15 in. is fully embedded in a saturated clay layer for which Ysat = can carry. (Let FS = 3.) Use the a method equation QsfpAL = ac₂pAL and the following table to estimate the skin friction and Vesic's method for point load estimation. Си α Pa ≤ 0.1 1.00 0.2 0.3 0.92 0.82 0.4 0.74 0.6 0.62 0.8 0.54 1.0 0.48 1.2 0.42 1.4 0.40 1.6 0.38 1.8 0.36 2.0 0.35 2.4 0.34 2.8 0.34 Note: atmospheric pressure pa ≈ 100 kN/m² or 2000 lb/ft². (Enter your answer to three significant figures.) Qall = kip 121 lb/ft³, = 0, and Cu = 1600 lb/ft². Determine the allowable load that the pile

A concrete pile 65 ft long having a cross section of 15 in. × 15 in. is fully embedded in a saturated clay layer for which Ysat = can carry. (Let FS = 3.) Use the a method equation QsfpAL = ac₂pAL and the following table to estimate the skin friction and Vesic's method for point load estimation. Си α Pa ≤ 0.1 1.00 0.2 0.3 0.92 0.82 0.4 0.74 0.6 0.62 0.8 0.54 1.0 0.48 1.2 0.42 1.4 0.40 1.6 0.38 1.8 0.36 2.0 0.35 2.4 0.34 2.8 0.34 Note: atmospheric pressure pa ≈ 100 kN/m² or 2000 lb/ft². (Enter your answer to three significant figures.) Qall = kip 121 lb/ft³, = 0, and Cu = 1600 lb/ft². Determine the allowable load that the pile

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter18: Pile Foundation

Section: Chapter Questions

Problem 18.21P: Refer to Figure 18.26b. Let L = 15.24 m, fill = 17.29 kN/m3, sat(clay) = 19.49 kN/m3, clay = 20, Hf...

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Refer to Figure 18.26b. Let L = 15.24 m, fill = 17.29 kN/m3, sat(clay) = 19.49 kN/m3, clay = 20, Hf = 3.05 m, and D = 0.406 m. The water table coincides with the top of the clay layer. Determine the total downward drag on the pile. Assume that = 0.6 clay. FIG. 18.26 Negative skin friction
Си A concrete pile 20 m long having a cross section of 0.25 m x 0.25 m is fully embedded in a saturated clay layer. For the clay, given: Ysat = 18 kN/m³, = 0, and c₁ = 80 kN/m². Determine the allowable load that the pile can carry (FS-3). Use the A method to estimate the skin resistance. For L = 20 m, A = 0.173. (Enter your answer to three significant figures.) Qall kN
In Problem 18.4, find the maximum bending moment in the sheet pile and determine the required section modulus, assuming an allowable stress of 190 MN/m2. 18.4 Refer to Figure 18.13. Given L1 = 1.5 m, L2 = 3 m; for the sand, =33, =16.5kN/m3, sat=19.0kN/m3; and, for the clay, c=50kN/m2, =0, sat=20kN/m3. Determine the depth of sheet pile required, allowing for a 50% increase from the theoretical estimate.
A 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).
A planned flexible load area (see Figure P7.2) is to be 3 m × 4.6 m and carries a uniformly distributed load of 180 kN/m2. Estimate the elastic settlement below the center of the loaded area. Assume that Df = 2 m and H = . Use Eq. (7.4).
Refer to Figure 18.9. A cantilever sheet pile is driven into a granular soil where the water table is 2 m (L1) below the top of the sand. The properties of the sand are =40, =17.5kN/m3, and sat=19kN/m3. It is proposed to excavate to a depth of 6 m (L) below the ground level. Determine the actual depth to which the sheet pile must be driven (L + D), using the net lateral pressure diagram. Note: Dactual=1.3(L3+L4)theory
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)]
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
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.
Consider a 500 mm diameter pile having a length of 18 m in a clay. Given: γ = 20.0 kN/m3 and cu = 60 kN/m2. Determine the maximum allowable load (Qall) with FS = 3. Use the α method and Table 12.11 for determining the skin friction and Eq. (12.20) for determining the point load. Allow a factor of safety of 3. What percentage of the ultimate load is being carried by the pile shaft? Is it a friction pile?
A concrete pile 16 in. 16 in. in cross section is shown in Figure P12.13. Calculate the ultimate skin friction resistance by using the a. method [use Eq. (12.61) and Table 12.11] b. method c. method Use R=20 for all clays, which are normally consolidated.
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.