Find the relative proportions of the load carried by the piles and the raft (X) in terms of
Find the stiffness of the piled raft
Answer to Problem 14.1P
The relative proportions of the load carried by the piles and the raft in terms of
The stiffness of the piled raft
Explanation of Solution
Given information:
The pile raft interaction factor
Calculation:
Consider the ratio of load on raft to total load of pile
Find the relative proportion carried by the raft (X) using the formula.
Find the ratio of load on pile to total load
Therefore, relative proportions of the load carried by the piles and the raft in terms of
Find the stiffness of the piled raft
Therefore, the stiffness of the piled raft
Want to see more full solutions like this?
Chapter 14 Solutions
Principles of Foundation Engineering (MindTap Course List)
- In a piled raft, 450 mm diameter and 13 m long piles are placed in a rectangular grid at 1.60 m 1.63 m spacing. Find the pile-raft interaction factor assuming uniform soil conditions with depth andarrow_forwardRefer to Figure 18.23. Given L1=3m, L2=6m, l1=1.5m, =16.5kN/m3, sat=19.0kN/m3 and =35. a. Find the required depth of the sheet pile, increasing the theoretical estimate by 30%. b. Determine the force in the tie rods if they are spaced 3 m apart horizontally. c. Find the maximum bending moment in the sheet pile.arrow_forwardThe design pile to be used in the bridge is a 13.5m long reinforced concrete with 8 28mm diameter reinforcement. The piles are determined to be suitable for moving and transport. Solve and illustrate the lifting points of the pile.arrow_forward
- An excavation 5 m depth is supported by a sheet pile. The sheet pile is extended 3.2 m below the ground and the water table is at the bottom of the pile. Unit weight of soil is 1.91 g/cc. Angle friction is 34°. 1. Which of the following most nearly gives the active force? a. 178.3 kN b. 133.73 kN c. 205.05 kN d. 151.56 kN 2. Which of the following most nearly gives the passive force? a. 274.9 kN b. 308.84 kN c. 339.38 kN d. 397.07 kN 3. Which of the following most nearly gives the passive resistance to mobilize stability? a. 388.2 kN b. 456.7 kN c. 548.04 kN d. 502.37 kNarrow_forwardFor the dam given in the figure, compute for the total horizontal load, total vertical load, the factors of safety against sliding and overturning, the resultant of the forces, its location, and the total moment at the toe. coefficient of friction is 1.5, unit weight ng concrete is 2400 kg/m^3.arrow_forwardThe tie rods from anchored sheet piles will be connected using a row of anchors, as shown in Figure 18.46a. Here H = 2.0 m, h = 1.25 m, B = 1.5 m, S = 2.5 m, = 32, and = 17.5 kN/m3. The anchor plates are made of 100 mm thick reinforced concrete with a unit weight of 24.0 kN/m3. Determine the ultimate holding capacity of the anchor used Ovesen and Stromanns method.arrow_forward
- 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).arrow_forwardA 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).arrow_forwardConsider a 13.5 m long concrete pile with a diameter of 0.45 m fully embedded in sand. For the sand, given unit weight, ? = 17.5 kN/m3 ; and soil friction angle, ϕ’ = 36 o . Estimate the frictional resistance according to Coyle and Castello’s method.arrow_forward
- A reinforced concrete pile weighing 30 kN is driven by a drop hammer weighing 40 kN and having an effective fall of 0.8 m. The average set per blow is 1.4 cm. The total temporary elastic compression is 1.8 cm. Assuming the co-efficient of restitution as 0.25 and a factor of safety 2, determine the ultimate bearing capacity and the allowable load for the pile using Hiley’s formula.arrow_forwardDetermine the ultimate load capacity of a circular pile with diameter D = 20 cm installed in asaturated soft clay. The pile is embedded 10 m into the ground. According to measurements, thesoil exhibits an undrained shear strength according to the linear relationship: Su = 2+1.6z, wherez is the depth in meters and Su is the undrained shear strength in kPa. The soil's unit weight canbe assumed as 18 kN/m3arrow_forwardA wood pile driven into the earth supports a load P=400 KN entirely by friction along its sides (see figure). The friction force f per unit length of pile is assumed to be distributed over the surface of the pile. The pile has length L=2m, cross sectional area A=1500 square mm, and modulus of elasticity E=30000 MPa. Include free body diagrams to illustrate derivations. Determine the deformation of the pile.arrow_forward
- Principles of Foundation Engineering (MindTap Cou...Civil EngineeringISBN:9781337705028Author:Braja M. Das, Nagaratnam SivakuganPublisher:Cengage LearningPrinciples of Foundation Engineering (MindTap Cou...Civil EngineeringISBN:9781305081550Author:Braja M. DasPublisher:Cengage Learning