Four columns x Five rows of group piles are installed into a uniform clay layer. Clay soil: c=40 kPa, Nc=7.5 Piles: Diameter = 350mm, Length=35m, Pile to pile spacing (center to center)=0.90m, pile edge distance (center of pile to edge of pile cap) =0.75m Pile cap: Thickness=950mm, pile cover=100mm, clear cover=75mm, db=25mm. f'c=28 MPa, fy=420 MPa a) Calculate the ultimate capacity of the pile using single pile analysis if alpha = 0.74 b) Calculate the ultimate capacity of the pile using block action if alpha = 0.74 c) Determine the group efficiency using the calculated values above.

Four columns x Five rows of group piles are installed into a uniform clay layer. Clay soil: c=40 kPa, Nc=7.5 Piles: Diameter = 350mm, Length=35m, Pile to pile spacing (center to center)=0.90m, pile edge distance (center of pile to edge of pile cap) =0.75m Pile cap: Thickness=950mm, pile cover=100mm, clear cover=75mm, db=25mm. f'c=28 MPa, fy=420 MPa a) Calculate the ultimate capacity of the pile using single pile analysis if alpha = 0.74 b) Calculate the ultimate capacity of the pile using block action if alpha = 0.74 c) Determine the group efficiency using the calculated values above.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter15: Retaining Walls, Braced Cuts, And Sheet Pile Walls

Section: Chapter Questions

Problem 15.22P

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Four columns x Five rows of group piles are installed into a uniform clay layer. Clay soil: c=40 kPa, Nc=7.5 Piles: Diameter = 350mm, Length=35m, Pile to pile spacing (center to center)=0.90m, pile edge distance (center of pile to edge of pile cap) =0.75m Pile cap: Thickness=950mm, pile cover=100mm, clear cover=75mm, db=25mm. f'c=28 MPa, fy=420 MPa Hint: Effective depth is found by subtracting the pile cover, clear cover, and half of bar diameter to the thickness. Please refer to the module a) Calculate the ultimate capacity of the pile using single pile analysis if alpha = 0.74 b) Calculate the ultimate capacity of the pile using block action if alpha = 0.74 c) Determine the group efficiency using the calculated values above.
PROBLEM 3: Four columns x Five rows of group piles are installed into a uniform clay layer. Clay soil: c=40 kPa, Nc=7.5 Piles: Diameter = 350mm, Length=35m, Pile to %3D pile spacing (center to center)=0.90m, pile edge distance (center of pile to edge of pile cap) =0.75m Pile cap: Thickness=950mm, pile cover=100mm, clear cover=75mm, db=25mm. f'c=28 MPa, fy=D420 MPa Hint: Effective depth is found by subtracting the pile cover, clear cover, and half of bar diameter to the thickness. a) Calculate the ultimate capacity of the pile using single pile analysis if alpha = 0.74 b) Calculate the ultimate capacity of the pile using block action if alpha = 0.74 c) Determine the group efficiency using the calculated values above.
A 3 x 3 pile group with pile spacing of 1 m and pile diameter of 0.40 m supports a load of 3 MN. Which of the following most nearly gives the consolidation settlement of clay layer in millimeter (e=0.65, Cc=0.30)?
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.
Check the total settlement of a group of pile as shown in Figure 1. The total allowable settlement is set not exceed 3% of the pile diameter and the overconsolidated ratio (OCR) of the clay is more than 1. The groundwater table is located 15m beneath the ground level. The diameter of the pile, b is 0.5m and the spacing between piles, s is 2m.The pile group is subjected to foundation load of 5425kN. The laboratory testing data for the soil samples taken are as follows: At 5m, eo = 0.55, Cc = 0.32, C; = 0.09, o'o = 150kN/m? At 10m, eo = 0.55, Cc = 0.32, Cs = 0.09, o'o = 225kN/m2 %3D At 12m, eo = 0.55, Cc = 0.32, C; = 0.09, o'o = 300KN/m2 %3D 7m 5m Clay 3 10m Unit weight = 18KN/m %3D Friction angle = 0 degree 2 Cohesion = 100KN/m
Determine the design capacity of the pile group shown below. The pile cap thickness is 1.5 meters, and groundwater table is located 2.8 meters below the ground surface. Piles are 350-mm in diameter and 12 meters in length. Use a critical depth equal to 18*dpile (starting from ground level), K = 3, ac (adhesion factor for clay) = 0.5, a, (wall friction angle for sand)= 25°, and FS = 3. Only consider single-pile action and neglect the capacity of the pile cap. Ground Level 1.5 m- Firm Clay c = 35 kPa Yary = 14.6 kN/m³ Yaut = 17.9 kN/m³ 3.5 m Medium Dense Sand 31° - 6.2 m Yary = 16.8 kN/m³ Yaat = 19.4 kN/m³ Layout of Pile Group Dense Sand 9 = 42° Yary = 18.2 kN/m³ Yu- 20.1 kN/m³ N - 200
X XXX L 4m X 5m 6 m Key: PILE I Soil 1 c = 35 kPa Y = 16.79 kN/m³ Soil 2 GROUND LEVEL c = 45 kPa Y = 18.76 kN/m³ Soil 3 c = 55 kPa Y = 19.71 kN/m² Soil 4 c = 60 kPa Y = 20.72 kN/m³ Question: Estimate the pile length required to carry the 900 kN axial load for the pile-soil system shown in the figure above.
Check the total settlement of a group of pile as shown in Figure 1. The total allowable settlement is set not exceed 3% of the pile diameter and the overconsolidated ratio (OCR) of the clay is more than 1. The groundwater table is located 15m beneath the ground level. The diameter of the pile, b is 0.5m and the spacing between piles, s is 2m.The pile group is subjected to foundation load of 5425KN. The laboratory testing data for the soil samples taken are as follows: At 5m, eo = 0.55, Cc = 0.32, C; = 0.09, ơ'o = 150kN/m? At 10m, eo = 0.55, Cc = 0.32, Cs = 0.09, o'o = 225KN/m? At 12m, eo = 0.55, Cc = 0.32, Cs = 0.09, o'o = 300KN/m? 7m 5m Clay 3 10m Unit weight = 18KN/m Friction angle = 0 degree 2 Cohesion = 100KN/m Figure 1: Pile system
Check the total settlement of a group of pile as shown in Figure 1. The total allowable settlement is set not exceed 3% of the pile diameter and the overconsolidated ratio (OCR) of the clay is more than 1. The groundwater table is located 15m beneath the ground level. The diameter of the pile, b is 0.5m and the spacing between piles, s is 2m.The pile group is subjected to foundation load of 5425KN. The laboratory testing data for the soil samples taken are as follows: At 5m, eo = 0.55, Cc = 0.32, C, = 0.09, ơ'o = 150KN/m? At 10m, eo = 0.55, Cc = 0.32, C; = 0.09, o'o = 225KN/m? At 12m, e, = 0.55, Cc = 0.32, C, = 0.09, oo = 300KN/m? 7m 5m Clay 10m Unit weight = 18kN/m Friction angle = 0 degree Cohesion = 100KN/m
Please help me solve The soil profile and soil properties at a site are shown in the table below. A group of 12 concrete piles in a 3 x 4 matrix and of length 12 m is used to support a load. The pile diameter is 0.45 m and pile spacing is 1.5 m. Determine the allowable load capacity for a factor of safety of 2. Calculate the total settlement (elastic and consolidation) under the allowable load. Assume Ep 520 x 106 kPa.
Design the anchored sheet pile wall supporting a loose sand fill as shown in the following Figure. GWT is at the same height on both sides, and assume yw=10kN/m³. Based on the log spiral solutions, the Ka for the loose sand is 0.3 while the K₂ and Kp for the dense sand are 0.2 and 13.125, respectively. Using the fixed earth support method, do the following: a) For a factor of safety of 2 on the passive resistance, determine the requirea depth of penetration depth, D. (initial trial with D'=1.5m) b) Determine the bending moment and the anchor load. c) Select a sheet pile section from the Table 9.1 (E-210x10³ MN/m² and fa-210 MN/m²) D O 7.0m. Yt = 16.5 kN/m³ $' = 30° Z Loose sand fill: Yt 19.5 kN/m3 $' = 30° Dense sand: Yt = 21 kN/m³ $' = 40° q=10 1.5m. 0.5m. kN/m²
Q4: It is required to construct a pile foundation comprised of 25 piles arranged in 5 columns at distances of 120 cm center to center. The diameter and lengths of the piles are 50 cm and 12 m respectively. The bottom of the pile cap is located at a depth of 3 m from the ground surface. The details of the soil properties etc. are as given below with reference to ground level as the datum. The water table was found at a depth of 6 m from ground level. Compute the consolidation settlement of the pile foundation if the total load imposed on * the foundation is 3000 KN 25 degrees Depth Soil properties From 0 Silt, saturated, y= 15.8 kN/m³ 3 Clay, saturated, y = 18.80 kN/m³ 5 Clay, saturated, y = 19.6 kN/m³, qu 125 kN/m², eo 0.75, C 0.27 10 Clay, y = 18.30 kN/m³, qu = 100 kN/m², eo = 0.97, Ce=0.41 14 Clay, y 19.85 kN/m³, g 165 kN/m², eo -0.68, Ce-0.24 Rocky stratum 18 To 3 5 10 14 18