Principles of Foundation Engineering (MindTap Course List)
8th Edition
ISBN: 9781305081550
Author: Braja M. Das
Publisher: Cengage Learning
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Chapter 9, Problem 9.13P
To determine
Find the ultimate load carrying capacity of the pile.
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Please answer 11.15
(Answer)
32.5kN
A group pile in clay is shown in the figure below. Determine the maximum vertical load Qg
be applied if the allowable consolidation settlement of the pile group is set to be 0.17 m. Use the
2:1 stress distribution method to estimate the average effective stress in the clay layer.
can
Qg
3 m
Sand
Groundwater
y = 15.72 kN/m3
table
Sand
3 m
Ysat =
18.55 kN/m3
2.75 m
X 2.75 m
Group
plan
Normally consolidated clay
Ysat = 19.18 kN/m³
15 m
18 m
eo = 1
C.
= 0,8
Normally consolidated clay
Ysat = 19 kN/m3
eo = 0.25, C. =1
5 m
Rock
A hammer pile driver has a hammer with mass of 700 kilograms. It falls onto the top of a 140-kilogram pile from a 150 centimeter height, causing it to be buried 0.120 meters into the ground. If the impact is perfectly elastic, that is, e = 0, what is the average penetration resistance of the ground?
Chapter 9 Solutions
Principles of Foundation Engineering (MindTap Course List)
Ch. 9 - A 20 m long concrete pile is shown in Figure...Ch. 9 - Refer to the pile shown in Figure P9.1. Estimate...Ch. 9 - Prob. 9.3PCh. 9 - A driven closed-ended pile, circular in cross...Ch. 9 - Prob. 9.5PCh. 9 - Prob. 9.6PCh. 9 - Prob. 9.7PCh. 9 - Prob. 9.8PCh. 9 - Prob. 9.9PCh. 9 - A concrete pile 16 in. 16 in. in cross section is...
Ch. 9 - Prob. 9.11PCh. 9 - Solve Problem 12.13 using Eqs. (12.59) and...Ch. 9 - Prob. 9.13PCh. 9 - Prob. 9.14PCh. 9 - A steel pile (H-section; HP 310 125; see Table...Ch. 9 - A concrete pile is 20 m long and has a cross...Ch. 9 - Prob. 9.17PCh. 9 - Prob. 9.18PCh. 9 - Solve Problem 12.23 using the method of Broms....Ch. 9 - Prob. 9.20PCh. 9 - Solve Problem 12.25 using the modified EN formula....Ch. 9 - Solve Problem 12.25 using the modified Danish...Ch. 9 - Figure 12.49a shows a pile. Let L = 15 m, D (pile...Ch. 9 - Redo Problem 12.30 assuming that the water table...Ch. 9 - Refer to Figure 12.49b. Let L = 18 m, fill = 17...Ch. 9 - A concrete pile measuring 16 in. × 16 in. in cross...Ch. 9 - The plan of a group pile is shown in Figure...Ch. 9 - Prob. 9.28PCh. 9 - The section of a 4 × 4 group pile in a layered...Ch. 9 - Prob. 9.30P
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- Refer to Figure 18.13. Given L1 = 1.5 m, L2 = 3 m; for the sand, =33, =16.5kN/m3, sat=19.0kN/m3; and, for the clay, c=50kN/m2, =0, sat=20kN/m3. Determine the depth of sheet pile required, allowing for a 50% increase from the theoretical estimate.arrow_forwardA 450 mm x 450 mm concrete pile 20.0 m long is driven into sand deposits with y = 17 kN/m³ and = 30°. Find the ultimate load i.e. point load Qp by Meyerhoff's method and Janbu method. Meyerhoff's N = 55, Atmospheric pressure = 100 kN/m², Janbu's N = 18.4arrow_forwardRefer to Figure 18.9. A cantilever sheet pile is driven into a granular soil where the water table is 2 m (L1) below the top of the sand. The properties of the sand are =40, =17.5kN/m3, and sat=19kN/m3. It is proposed to excavate to a depth of 6 m (L) below the ground level. Determine the actual depth to which the sheet pile must be driven (L + D), using the net lateral pressure diagram. Note: Dactual=1.3(L3+L4)theoryarrow_forward
- Refer to Figure 18.26b. Let L = 15.24 m, fill = 17.29 kN/m3, sat(clay) = 19.49 kN/m3, clay = 20, Hf = 3.05 m, and D = 0.406 m. The water table coincides with the top of the clay layer. Determine the total downward drag on the pile. Assume that = 0.6 clay. FIG. 18.26 Negative skin frictionarrow_forwardDetermine the penetration depth for a 30 cm dia concrete pile which is required to carry a load of 1200 KN at a factor of safety 3.0. The soil consists of silty sand up to a depth of 10 m in which the average cone resistance qcav = 4400 KPA. Silty sand is underlain by dense sand. The average cone resistance increases to 12000 kPa with in depth 10 to 12 m and to 15000 KPA below 12 m.arrow_forwardThe figure below shows a cantilever sheet-pile wall penetrating a clay. (a) Determine the actual depth of penetration, (b) maximum moment, and (c) section modulus of the sheet-pile section. Use all = 160MN/m² L_{1} = 1.8m L_{2} = 2.6m Ydry = 17.58kN/m³ Ysat 18.69kN/m³ theta = 20 deg c' = 10kPaarrow_forward
- Find the maximum pile capacity for the pile group shown in figure below. If My = 500 kN.m and V = 7200 kN. 'My X=1.4 - x=1.4- y=1.2 y=1.2arrow_forwardDetermine the primary consolidation settlement for the 20 m long pile group shown below. Soil properties by layer are given in the figure, and the clay layers are normally consolidated. Assume a 2:1 load spread starting at a depth of 2/3 of the embedment depth, L. The pile group is square and has dimensions 2.6 m by 2.6 m in plan view. The groundwater table is 1 m below the ground surface. = 4000 kN 1 m Sandy soil Y =18.5 kN/m³ Q'=330 V W.T. 7 m -Group.. piles Clay 1 Y =17.2 kN/m3 e=0.83 C= 0.23 L= 20 m Ax B = 2.6 m x 14 m 2.6 m Clay 2 Y =17.5 kN/m3 e,=0.78 C=0.22. 8 m Clay 3 Y =18.0 kN/m? eo=0.76 C=0.20 12 m Rockarrow_forward1. Refer the Fig. 1. Estimate the side resistance Qs by a. Meyerhof's method. K= 1.5 and d'= 0.6 Ø Coyle and Castello's method b. Concrete pile 460 mm x 450 mm I Loose sand 20 m 0', -30° Y=18.6 kN/m³ TE Dense sand 0₂-42* Y-18 6 kN/m² Fig. 1arrow_forward
- Please answer 11.26arrow_forwardA square prestressed concrete pile with a cross section 0.3 m by 0.3 m is driven 15 m into overconsolidated clays with properties as defined: From the ground surface to a depth of 7 m, the unit weight is 17 kN/m3 and the shear strength cohesion cu is 70 kPa; below 7 m, the soil unit weight is 18.5 kN/m3 and cohesion is 105 kPa. Use the total stress α-method to calculate both the design downward axial capacity and upward axial capacity, using a factor of safety of 3 (downward and upward).arrow_forwardA concrete pile 20 m long and having a cross section of 0.38m x 0.38m is fully embedded in sand, for which γ = 17 kN/m3 and φ’ = 25o. Calculate: a) The ultimate point load, Qp, by Meyerhof’s method b) The total frictional resistance for K=1.4 and δ= 0.7φ. c) The allowable pile capacity for a FS = 3.arrow_forward
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