10-1. A 12-in. square concrete pile is driven into loosesand to a depth of 30 ft. Soil conditions are shownin Figure 10-34. Find the pile's axial capacity if K isassumed to be 0.7 and the factor of safety is 2.10-2. Rework Problem 10-1, assuming that the ground-water table is located 5 ft below the ground surface.

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Answered: 10-1. A 12-in. square concrete pile is…

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 12.18P: A steel pile (H-section; HP 310 125; see Table 12.1a) is driven into a layer of sandstone. The...

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A steel pile (H-section; HP 310 125; see Table 12.1a) is driven into a layer of sandstone. The length of the pile is 25 m. Following are the properties of the sandstone: unconfined compression strength = qu(lab) = 80 MN/m2 and angle of friction = 36. Using a factor of safety of 3, estimate the allowable point load that can be carried by the pile. Use [qu(design) = qu(lab)/5].
A12-in. steel H-pile is driven 60 ft into clay soil as follows: From the ground surface to a depth of 30 ft, the cohesion is 800 psf and the unit weight is 105 pcf; below 30 ft, the cohesion cu is 2,000 psf and the unit weight is 115 pcf. Assume that the upper clay layer is normally consolidated and the deeper clay is overconsolidated. Use the α-method to determine the axial capacity of the pile, using a factor of safety of 2.75. Compute the shaft capacity assuming that resistance is developed on the surface of the rectangle (12 in. square) that encloses the pile.
Choose a correct answer for the following: 1- In order to protect the structure from the failure by piping, it must be: A- Increase the depth of the U/S pile C- Increase the length of the floor B- Increase the depth of the D/S pile D- All of the above 2- The U.S.B.R. No. III stilling basin is used when: A- V 15 m/sec and Fr 4.5 D- V > 15 m/sec and Fr > 4.5 3- If the equation of the water surface inside a warped transition is ( y 0.00156 x2), and the length of this transition is 16m, the total difference between U/S and D/S water level (Ay') is: A-0.39936m B- 0.09984m C-0.19968m D-0.02496m 4- The failure of earth dam by overtopping can occur when: A- The flood design is underestimated C- The spillway gates are not properly operated B- The spillway is insufficient capacity D- All of the above 5- The top level of the core zone in the earth dam should be at least Im above the maximum water level to prevent: À- piping through the body of the dam C- Seepage by capillary siphoning B-…
A 12 inch diameter concrete pile is to be driven into a clay deposit as shown in Figure 2. The pile's design capacity is 30 tons. Determine the length of the pile to carry that 30 tons load if the factor of safety is 2. O Design = 30 tons L = ? Clay Unconfined Compression Strength, qu= 4800 psf Y = 126 pcf - - 12 in. Diameter
A pre cast pile having a cross section of 0.20m x 0.200 is placed at a position as shown in the figure. The weight of the pile is 981 N acting at its centroid at G. The pile is resting at points A, B and C. Assuming smooth surface. Which of the following gives the reaction at point A,B,C.
Evaluate the resisting capacity against axial load due to skin friction on the following conditions. Size of pile: 0.30 m Depth of penetration into the soil: 20 m Unconfined compression strength: 110 kPa Ans. 1320 kN
A driven closed-ended pile, circular in cross section....n approximate ultimate point laod on the basis parts a and b the ultimate frictional resistance the allowable load
A four-pile group consists of 12 in. square prestressed concrete piles 35 ft long. The piles are driven into an overconsolidated clay whose cohesion cu is 2,000 psf and whose soil unit weight is 115 pcf. The pile spacing is diameters. The water table is at the ground surface. Using a factor of safety of 3, find the capacity of the pile group (α-method).
Q- A precast concrete pile is driven with a 50 KN hammer falling through a height of 1.0 m with an efficiency of 0.6. The set value observed is 4 mm per blow and the combined temporary compression of the pile, cushion and the ground is 6 mm. As per Modified Hiley Formula, find the ultimate resistance of the pile.
need fast and complete solution A prestressed concrete pile, 496 mm in diameter, is to be driven in a clayey soil. The pile has a design capacity of 404 kN. Use FS = 2, unconfined compressive strength = 158 kPa. Compute the length (in m.) of the pile if the frictional constant is 0.8. Round off to two decimal places.
An 18 in diameter, 75 ft long ACIP pile is to be constructed in the following soil profile: Depth(ft) SoilDescription Unit Weight(lb/ft3) Undrained ShearStrength(lb/ft2) EffectiveFrictionAngle(deg) SPTN60 0–15 Silty sand 120 28 15–40 Clayey silt 115 1500 40–60 Sandy silt(nonplastic) 119 25 60–70 Well-gradedsand 124 32 70–90 Well-gradedsand 127 35 40 The groundwater table is at a depth of 25 ft. Using a factor of safety of 3.0, determine the ASD allowable downward load capacity.
An RC column of size 400 mm × 400 mm is supported on four piles of 300 mm diameter (bored cast in situ piles). The column carries a load of 750 kN and a moment of 250 kNm in the x–x direction. Design the pile cap assuming M25 concrete and Fe 415 steel. Further, assume that the piles are capable of resisting the reaction from the pile cap.

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