Nine piles of 300 mm dia and 8 m length are arranged in a square pattern for the foundation for a column in a uniform deposit of medium stiff clay (qu the centre to centre spacing of piles is = 100 kN/m2). If 900 mm and adhesion factor = 0.9, calculate the capacity of the pile group assuming a F.O.S. of 2.5.
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- 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.The 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 of 9 friction piles are arranged in a square grid maintaining equal spacing is all direction. Each piles is of diameter 300 mm and length 7 m. Assume that the soil is cohesionless with effective friction angle = 32°. What is the centre to centre spacing of the piles (in m) for the piles group efficiency of 60%? 100
- 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 0.75m5 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 5 x 5 group piles of 0.4 m diameter displacement piles are to be constructed. The spacing between piles is 3D center to center. The thickness of the pile cup is 1.2 m and extends 0.5D from each side. The length of the piles is 20 m. The down word service load is 1000 ton. Use 2:1 method to compute the consolidation settlement under this load. Properties of the normally consolidated clay layer follows: Depth of the clay layer from ground surface to rock layer is 30 m. e= 0.5, c = 0.2
- a group of 9 piles of 29 cm diameter is arranged in a square configuration with a center-to-center spacing of 1.86 m. The length of the piles is 11 m. Unit cohesion of the clay is 86 kPa. Determine the ultimate group capacity of the pile group based on block failure. Assume adhesion factor of 0.7.for pile shown in fig. below, Sind Qu дозжазт 3m XX =30 S=0.84 Sang XXX Ks=1+3 = 16 kN m. 꽃 Q=36 Sand G= 0.74 ks = 104 85-4 1711. m clay си=50 кра 207 Xead = 18 KN 3 Q2 * Qu=Ap 4 Qb = AP (CNC + BV₂NH j +0.5XD NY 5m • Q₁ = {(ca + ks Sv tand *As L=1 ۲/۵ 12m BAZAT CHEESA 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 kN
- A 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?Determine the consolidation settlement of piles group shown below. Sand y = 105 lb/ft³ Groundwater table 45 ft 2V:1H Clay Clay (not to scale) 30 ft Q₂ = 500 Kip di A A0(2) x 3 ft 27 ft 21 ft (3 40(3) 2V:IH 6 ft Cay Ysat = 115 lb/ft³ 48 ft = 0.82 C₁ = 0.3 Ysat = 120 lb/ft³ € = 0.7 12 ft C = 0.2 Rock Pile group: L = 9 ft: B,= 6 ft Ysat = 122 lb/ft³ 6te = 0.75 C₂ = 0.25A 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 0.4