A group of 12 friction piles, having 15 m length and 400 mm diameter each are arranged at a centre to centre spacing of 1.3 m in loose to medium cohesionless soil. Group efficiency of the pile group is
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- Questions A group of 16 piles (4 in each row) was installed in a layered clay soil deposit shown below. The diameter of each pile is 500 mm and their c/c distance is 1m. The length of the pile group is 18m. Estimate the safe load capacity of the group with a factor of safety of 2.50. The adhesion factor (a) between the pile and soil in each soil layer are shown in the figure. 8 m 10 m C= 25 kPa;= 0°; a = 1.0 C₁= 40 kPa;p= 0; a = 0.7 TTTTTT Soil Profile O O O boor Plan View of pile groupA 400 mm diameter, 10 m long piles are used as foundation for a column in uniform deposit of clay (cu = 600 kN/m2). The spacing between pile is 300 mm. There are 9 piles in the group arranged in a square pattern. Determine the group efficiency assuming adhesion factor 0.4Figure P12.36 shows a 3 5 pile group consisting of 15 concrete piles of 400 mm diameter and 12 m in length. What would be the maximum load that can be allowed on the mat with a factor of safety of 3? The piles have a center-to-center spacing of 1200 mm.
- 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 = 0.2The section of 4*5 group pipe pile, each 15 m in long, embedded in clay layer, the diameter of pile = 403 mm, the center to center spacing of the piles is 700 mm. The clay layer properties, Cu = 60 kN/m2, saturated unit weight = 18.33 kN/m3 Solve the questions 5 - 8. Find the empirical adhesion factor (a) * 1 0.92 0.82 0.74 0.62 None of the above.A group pile has a section of 4 x 4 with each having a diameter of 305 mm are embedded in clay. The length of the piles are 12 m and the spacing between the piles (d) are 1.0 m. The recorded soil profile for the ground is shown in Table 1. Propose the allowable load bearing capacity of the pile with a factor of safety of (FS) of 3. (b) TABLE 1 : Soil type and soil parameter Depth Soil parameter 0.0 m to 2.0 m | Unit weight = 17.5 kN/m³ Cohesion = 20 kN/m? 2.0 m to 8.0 m Unit weight = 18.5 kN/m³ Cohesion = 60 kN/m? 8.0 m to 15.0 m Unit weight = 20.1 kN/m³ Cohesion = 80 kN/m?
- A group of piles as shown on the figure has a cross section of 0.30 m x 0.30 m. It has a total length of 15 m. The piles are embedded in a homogeneous saturated clay with Cu = 70 kPa. Unit weight of clay is 18.8 kN/m³ and the ground water table is located at a depth of 18 m. below the ground surface. Factor of safety = 4. Compute the allowable load- bearing capacity of the group of pile acting as individual piles. Qall Clay Cu70 kPa 70 15m 56 m- LI-2.74 m -Lz=3,96- Ans. 2816.10 kNA group pile has a section of 4 x 4 with each having a diameter of 305 mm are embedded in clay. The length of the piles are 12 m and the spacing between the piles (d) are 1.0 m. The recorded soil profile for the ground is shown in Table 1. Propose the allowable load bearing capacity of the pile with a factor of safety of (FS) of 3. (b) TABLE 1: Soil type and soil parameter Depth Soil parameter Unit weight = 17.5 kN/m³ = 20 kN/m2 0.0 m to 2.0 m Cohesion %3D 2.0 m to 8.0 m Unit weight = 18.5 kN/m³ %3D Cohesion = 60 kN/m? 8.0 m to 15.0 m Unit weight= 20.1 kN/m³ %3D Cohesion = 80 kN/m2A nine pile group consists of 0.30m diameter friction concrete piles 12m long. The piles are driven into clay having an unconfined compressive strength of 180kPa and the unit weight of clay is 18kN/m3. The spacing of piles is 0.75m center to center. Assuming a bearing capacity factor of Nc = 9, a= 1.0. Which of the following most nearly gives the minimum pile spacing in order to achieve 100% efficiency?
- A nine-pile group composed of 0.30 m diameter pipe piles is embedded 15 m in clay soil with conditions indicated by the sketch. 1. Det the total capacity if piles act individually 2. Find the total capacity if piles act as a group 3. Det the design load if factor of safety is 3. C = 42.81 kpa a = 0.85 6m C = 57.46 kpa a = 0.75 6m C = 95.76 kpa a = 0.5 Nc = 8 3m 0.75m 1-8 0.75m 上tt 0.75m 0.75mA nine pile group consists of 0.30m diameter friction concrete piles 12m long. The piles are driven into clay having an unconfined compressive strength of 180kPa and the unit weight of clay is 18kN/m3. The spacing of piles is 0.75m center to center. Assuming a bearing capacity factor of Nc = 9, a= 1.0. Which of the following most nearly gives the allowable group pile capacity based on individual pile failure using a factor of safety of 3.A group of piles are arranged as shown in the figure. The piles are square in section with sides equal to 400 mm and has a spacing of 1.80 m on centers. One pile has a total length of 18 m. Unit weight of clay is 19.7 kN/m3 and has a cohesion of 90 kPa. Ground water table is located at depth of 20 m below the ground surface. Adhesion factor is 0.90. Determine the ultimate load – bearing capacity of the group of piles considering the piles acting individually.