A group of 9 friction piles, 10 m long is used as a foundation for a bridge pier. The piles used are 30 cm in diameter with centre to centre spacing of 0.9 m. The sub soil consists of clay with unconfined compressive strength of 1.5 kg/cm2. The efficiency for pile group will be (Take a = 0.9)

A group of 9 friction piles, 10 m long is used as a foundation for a bridge pier. The piles used are 30 cm in diameter with centre to centre spacing of 0.9 m. The sub soil consists of clay with unconfined compressive strength of 1.5 kg/cm2. The efficiency for pile group will be (Take a = 0.9)

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Related questions

Q: Three cast-in-place piles with a diameter of 480mm are installed under a certain platform, the pile…

A: As given in the question, a pile is casted in three layers of soil. The shear resistance of each…

Q: 3.8 The soil profi le at a site for an offshore structure is shown in Figure P13.8. The height of…

A: Given:- The height of the pile above the sand surface = 15 m The diameter of the pile = 1.25 m The…

Q: A hammer pile driver has a hammer with mass of 700 kilograms. It falls onto the top of a…

Q: Example 3 A 12 m prestressed concrete pile 450 mm square is installed in a clay with water table at…

A: given- 12 m prestressed concrete pile450 mm squareclay with water table at 5 m depthupper clay layer…

Q: A 450 mm x 450 mm concrete pile 20.0 m long is driven into sand deposits with y = 17 kN/m³ and =…

Q: Compute the ultimate load bearing capacity of the group of piles considering the piles acts Individu…

Q: The wooden pile shown in the figure has a diameter of 90 mm and is subjected to a load of P = 60 kN.…

Q: A rectangular pile (0.67 x 0.5 m.) is driven in a clayey soil arrangement composed of two different…

Q: centre. Referring corresponding figure, calculate uplift pressure percentages at key points C1, E2,…

Q: A concrete pile with 20 m embedded length having 50 cm diameter is driven into a homogeneous…

A: Length of the pile, L = 20mDiameter of the pile, D = 0.5mCohesion, Cu = 30kN/m2Adhesion factor, =…

Q: e figure has a diameter of 120 mm and is subjected to a load of P = 80 kN. Along the length of the…

Q: A 5x 5 group piles of 0.4 m diameter displacement piles are to be constructed. The spacing between…

A: Solution: Given Data: d=0.4mthickness of pile, z=1.2 mLength of pile, L=20 mSpacing of pile=3…

Q: A 600 mm diameter and 25 m long driven concrete pile carries a column load of 1200 kN. It is…

A: The length of the pile is .The diameter of the piles is .Total column load is .Shaft resistance is…

Q: and thereafter, Cu 132, 32, where z is the depth Z IS each strata. Determine the ultimate capacity…

Q: 12.1 A 1500 kN load was applied on two 20 m long and 500 mm diameter piles that were instrumented…

Q: Square concrete piles are arranged in 5 row by 5 column formation beneath the pile cap. These piles…

A: The efficiency of the pile group is defined as the ratio of the average capacity of a pile in the…

Q: Find the force F in the image below such that the deep pile foundation under the structure frame…

A: Find Force F

Q: o Given: A earth pile with L, E, and A known and constant F Y X (L-x) steel pile soil f =…

Q: Redo Problem 9.23 assuming that the water table coincides with the top of the fill and that…

A: Solution Calculate the total downward drag force or negative skin friction using the following…

Q: A group of 9 piles of 31 cm diameter is arranged in a square configuration with a center-to-center…

Q: shear strength of 80 kN/m². The lower la undrained shear strength of 120 kN/m². A n of pile doesn't…

A: solution (b) The top 1m of the pipe does not sopport load due to clay and concrete…

Q: a group of 9 piles of 29 cm diameter is arranged in a square configuration with a center-to-center…

A: Total number of piles = 9Diameter of pile =29cm =0.29mCentre to centre spacing of piles, S…

Q: In Hiley’s formula for driven piles i.e. R=E/(s+0.5c), why is a coefficient of 0.5 applied for the…

A: Answer Hilley's Formula is based on the principle of energy of conservation.

Q: A group of 9 piles of 33 cm diameter is arranged in a square configuration with a center-to-center…

Q: Design Procedure D y = 100 lb/ft³ ka = 0.3 kp = 3.0 Pp Z₁ Zp 4 2 Za Z Ap Solve for D Pa 1 2 3 4 0…

A: A cantilever retaining sheet pile is given and active and passive earth pressure is acting on it.

Q: ed in a layer of sand. The following is an approximation penetration resistance (q.) and the…

A: Given:- pile size=0.406m x 0.406m L=18.3m FS=4 To find:- allowable bearing capacity of the pile

Q: For the (4 x 4) pile group as shown in the figure, the settlement of pile group, in a normally…

Q: A square pile group of 9 piles passes through a recently filled up material of 3.5 m depth. The…

A: A square pile group of 9 piles,Depth of pile = 9 m,Depth of soil fill =3.5 m,Diameter of the pile=30…

Q: A group of nine piles 300 mm in diameter is driven into a clay layer 16 m thick with rock below the…

A: Given:- D=300mm t =1 6m L=9m Spaced = 500 mm c/c undrained shear strength = 100kN/m2 α=0.5, Eu =40…

Q: Determine the diameter of 70 ft long pile driven in the medium dense sand (Shown in Figure). Design…

Q: Question A pile of 0.50 m diameter and of length 10 m is embedded in a deposit of clay. The…

Q: The wooden pile shown in the figure has a diameter of 95 mm and is subjected to a load of P = 80 kN.…

A: Appreciate if there is detailed work with explanation and finds you helpful for ease of…

Q: concrete pile 1S.24 m long haVing fully embedded in a saturated clay layer for which y = 19.02…

A: Capacity of the pile shaft isQ=∑ αCuPLusing tableα=0.54…

Q: A group pile in clay is shown in the figure below. Determine the maximum vertical load Qg be applied…

A: Different soils strata and their properties are given. To find maximum permissible vertical load,…

Q: A rectangular pile (0.77 x 0.72 m) is driven in a clayey soil arrangement composed of two different…

A: Given Pile dimensions : 0.77m x 0.72m Factor of safety : 2 Figure corresponds to given data: Skin…

Q: In a 16 (4 x4) piles group, the pile diameter is 0.4 m and center to center spacing of piles in the…

Q: n-situ stresses - Seepage condition xample: For the sheet pile which uried in sandy soil ,shown in…

A: The given data is: The water level is situated at the depth=2 m Assume, the dry unit weight of the…

Q: Determine the allowable load capacity of the 0.4 m diameter pile shown in Figure 4. The fill is new…

Q: A cellular cofferdam of 8.4 m radius and 15 m height is proposed for flood protection. Properties of…

A: The factor of Safety: The factor of safety is the ratio of the yield stress to the working stress of…

Q: The wooden pile shown in the figure has a diameter of 100 mm and is subjected to a load of P = 70…

A: This question is related to the Strength of Material.

Concept explainers

Braced cuts

The braced cut is a method of providing lateral support to the soil in foundation trenches, to prevent the trenches from deformation by the caving in of soil and resisting it from moving laterally. During shallow excavation in firm soil, generally, slopes are provided to resist the caving in of soil. During shallow excavation in soft soil and deep excavation, the chances of caving in of soil increase. Hence, it becomes necessary to make a provision to resist the deformation of trenches due to caving in of soil. The braced cut is the method used for such conditions. The excavation using braced cuts is a bit uneconomical as compared to the traditional open-cut excavation method but provides better safety than the cut excavation method.

Question

A group of 9 friction piles, 10 m long is used as a foundation for a
bridge pier. The piles used are 30 cm in diameter with centre to centre
spacing of 0.9 m. The sub soil consists of clay with unconfined
compressive strength of 1.5 kg/cm2. The efficiency for pile group will
be
(Take a = 0.9)

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.

Similar questions

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
The wooden pile shown in the figure has a diameter of 95 mm and is subjected to a load of P = 80 kN. Along the length of the pile and around its perimeter, soil supplies a constant frictional resistance of w = 2.90 kN/m. The length of the pile is L = 5.6 m and its elastic modulus is E = 8.6 GPa.Calculate(a) the force FB needed at the base of the pile for equilibrium.(b) the magnitude of the downward displacement at A relative to B.
PILE FOUNDATIONS • Example: 35/1 A machine foundation is supported by four prestressed concrete plies driven to bedrock. The length of each pile is 24 m, and they are 0.3 mx 0.3 m in cross section. The weight of the machine and the foundation is 1360 kN. Given: unit weight of concrete = 24 kN/m¹ and the modulus of elasticity of the concrete used for the piles = 24.5 × 106 kPa. Determine the natural frequency of the pile foundation system.
The wooden pile shown in the figure has a diameter of 105 mm and is subjected to a load of P = 70 kN. Along the length of the pile and around its perimeter, soil supplies a constant frictional resistance of w = 3.85 kN/m. The length of the pile is L = 4.0 m and its elastic modulus is E= 12.9 GPa. Calculate (a) the force Fg needed at the base of the pile for equilibrium. (b) the magnitude of the downward displacement at A relative to B. y L Answers: (a) FB = (b) UA= i i B FB KN mm
Q1/ For the footing shown in Figure (1), estimate the pile group capacity. 0.6m dia bored pile Clay c=80 kN/m² y-17kN/m² S=1.5 m T L=12 m
A group of 9 piles of 29 cm diameter is arranged in a square configuration with a center-to-center spacing of 1.01 m. The length of the piles is 12 m. Unit cohesion of the clay is 80 kPa. Determine the ultimate group capacity of the pile group based on block failure. Assume adhesion factor of 0.69.
[Geotechnical design] Please finish the answer step by step and clear to see. Thank you!
The pile driver drives the 91.4 cm centers piles until the penetration under the last hammer blow is 2.54 cm in a quicksand (Bearing = 5.38 ton/m2). The driver’s 1-ton hammer drops 2.6 m. Piles are sawn off and surmounted by a concrete slab 91.4 cm thick. What average bearing power in Ton/m2, does this foundation provide?
Determine the design capacity of the concrete pile shown in Figure 3 for a factor of safety of 2. 2 Design = ? |VIAYIAY/YIAVAVIAVA Groundwater Table 6 m Dense Sand 20 m y = 20.45 kN/m O = 37* K = 0.90 0.5 m Điameter
A square concrete pile of 10 m length is driven into a deep layer of uniform homogeneous clay. The average unconfined compressive strength of the clay, determined through laboratory tests on undisturbed samples extracted from the clay layer, is 100 kPa. If the ultimate compressive load capacity of the driven pile is 632 kN, the required width of the pile is mm. (in integer) (Bearing capacity factor Nc = 9; adhesion factor a = 0.7)
A pile of diameter 250 mm is installed in a soil strata with a recently filled layer of clay of 3 m depth. The unit cohesion of the material is 18 kN/m² and unit weight of soil is 15 kN/m². The negative skin friction on the pile is equal to. (assume adhesion factor = 0.4)