Design a square pile group to carry 400 kN in clay with an unconfined compression strength of 60kN/ (m²) The piles are 30 cm diameter and 6 m long. Adhesion factor may be taken as 0.6. Neglect end bearing.
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- Design a square pile group to carry 400 KN in clay with an unconfined compression strength of 60 kN/m². The piles are 300 mm diameter and 6 m long. Adhesion factor may be taken as 0.6.Figure 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 group of 9 piles of 33 cm diameter is arranged in a square configuration with a center-to-center spacing of 1.32m. the length of the piles is 13 m. Unit cohesion of the clay is 70kPa. Determine the ultimate group capacity of the pile froup based on block failure. Assume adhesion factor of 0.75.
- A group of 9 piles of 31 cm diameter is arranged in a square configuration with a center-to-center spacing of 1.85 m. The length of the piles is 14 m. Unit cohesion of the clay is 73 kPa. Determine the ultimate group capacity of the pile group based on block failure. Assume adhesion factor of 0.79.(i) What are the components of elastic settlement of piles? Name two parameters that affect the settlement. A 300 mm diameter pile penetrates a deep deposit of soft clay 9 m deep. Compute the skin friction and point bearing capacity. The clay has an undrained unit cohesion of 60 kN/m?. Assume a (ii) constant friction coefficient of 0.75 and use a method.A square pile of section 30 cm x 30 cm and length 10 m penetrates a deposit of clay having c = 5 kN/m² and the mobilizing factor m = 0.8. What is the load carried by the pile by skin friction only?
- 5 A group of 9 piles of 28 cm diameter is arranged in a square configuration with a center-to-center spacing of 1.11 m. The length of the piles is 13 m. Unit cohesion of the clay is 94 kPa. Determine the ultimate group capacity of the pile group based on block failure. Assume adhesion factor of 0.72. Round off to two decimal places.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 rectangular pile (0.77 x 0.72 m) is driven in a clayey soil arrangement composed of two different layers. First layer has a height of 7 m, cohesion of 53 kPa, friction factor of 0.89. Second layer has a height of 8 m , cohesion of 78 kPa, and friction factor of 0.88. Compute the allowable load, in kN, that the pile can carry if the factor of safety is 2.00. Compute the skin friction resistance in kN. Compute the end bearing capacity in kN. Round off to two decimal places.
- 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 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 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 0.75m