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2. A 26-meter concrete pile with a 50 cm diameter is driven into multiple layered soils as described down. The groundwater table is at a 6-meter depth below the surface. Using the Factor of Safety (FS -2.5). estimate the allowable pile capacity "Quiz:" that the pile can curry with each of the following: a Meyerhof's method b. Briaud's method c. Based on the results of part a and b, adopt a value of Qul Depth Soil SPT No m] 2 4 6 7.5 10 20 26 28 34 SP SM SM SP SP SP SP SM SM Blows/ 300 mm) 22 23 23 19 19 20 20 25 28 Dry unit weight [kN/m") 17 17 17 15 15 15 15 18 18 Sat, unit weight [N/m") 20 20 20 22 22 A&ANNNNNN The solution results are in the table below (N) NI N (N 1525.7 50.9% 49.1% Method Q-side Q-point Q-pile Q-side Q-point Q-all Meyerhof (,0) 1578.5 3105.2 1242.3 Coyle and Castello (0,0) 1436.7 Meyerhof (No) 1671.3 3634.8 Briaud (Neo) 2184.5 3481.1 49178 70.8% 1967.1 1963.5 46.0% 54.0% 1232.4 3426.9 64.0% 36.0% 1370.8 Homework #02 (Pile Design) 1. A 26-meter concrete pile with a cross-section of 50 cm x 50 cm is driven into multiple layered soils as described down. The groundwater table is at a 10-meter depth below the surface. Using the Factor of Safety (FS = 2.5), estimate the allowable pile capacity QALL" that the pile can carry with each of the following: a. Meyerhof's method. b. Coyle and Castello method. c. Based on the results of part a and b, adopt a value of Qall Depth Soil 2 4 6 7.5 10 20 26 28 34 SP SM SM SP SP SP SP SM SM friction angle, (deg) 30 32 32 28 28 28 28 36 36 Dry unit Sat. unit weight weight (kN/m) (kN/m) 17 20 17 20 17 20 15 22 15 22 15 22 15 22 18 21 18 21 ((Used K = 1.4 Ko, and 8 = 0.8 for Meyerhof method))

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