he 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 = 20 x 106 kPa.

he 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 = 20 x 106 kPa.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter19: Drilled Shaft

Section: Chapter Questions

Problem 19.10P

See similar textbooks

Similar questions

For a sand, given:D85 = 0.21 mmD50 = 0.13 mmD15 = 0.09 mmUniformity coefficient, Cu = 2.1Void ratio, e = 0.68Relative density = 53%Estimate the soil friction angle usinga. Eq. (2.87)b. Eq. (2.88)
A 12m high circular tank with 45m radius contains oil weighing 9.4kN/m3. This tank stands over a 3m saturated sand layer (γsat = 18.88 kN/m3) underlain by a 14m thick clay layer (γsat = 17.30 kN/m3 , e = 1.27 and Cc = 0.40). Neglect weight of the tank. Assume no precompression has occurred. What is the difference between the settlement below the center and below the end of the tank?
4.A layer of saturated clay is 10 m thick, the lower boundary being impermeable;an embankment is to be constructed above the clay. Determine the time requiredfor 90% consolidation of the clay layer. If 300 mm diameter sand drains at 4 mcentres in a square pattern were installed in the clay, in what time would the sameoverall degree of consolidation be reached? The coefficients of consolidation inthe vertical and horizontal directions, respectively, are 9.6 and 14.0 m^2/year.
(1b) Estimate the settlement of a 10 m square area loaded 1 m at 100 kN/ m3 placed 1 m below ground level with ground water at the level of the footing. The static cone resistance values for the sand deposit are as follows: G.L to 6 m = 8000kN/m3,6 -11 mm = 10,000kN/, below 11 m =12,000kN/m3.
A course sand sample is placed in the constant permeameter test. Water passes through the sample water with a constant head of 40cm and after 0.00167hr, 40grams of water have been collected. What is the coefficient of permeability of the sand in cm/sec if the sample is placed inside a 166cm container with a 7.89cm radius?
Determine by direct ibtegration the centeoid of the area shoen. Express answer in terms of a and h
A layer of silty soil of thickness 5 m lies below the ground surface at a particular site and below thesilt layer lies a clay stratum. The ground water table is at a depth of 4 m below the ground surface. The following data are available for both the silt and clay layers of soil. Silt layer: ?10= 0.018 mm, e= 0.7, and Gs = 2.7 Clay layer: e = 0.8 and Gs = 2.75 Required: (a) Height of capillary rise, (b) capillarypressure, (c) the effective pressure at theground surface, at groundwater table (GWT)level, at the bottom of the silt layerand at a depth of H =6 m below groundlevel, and (d) at a depth 2 m below ground level.(Sketch or draw the stress distribution diagram).
Geotechnical Engineering (UPVOTE WILL BE GIVEN. PLEASE ANSWER THE QUESTION CORRECLTY. NO LONG EXPLANATION NEEDED. FOLLOW THE INSTRUCTIONS CAREFULLY.) A moist soil weighed 895 g with a volume of 425 cm3. After drying, the sample weighed 775 g. Of the dried soil, 400 g was poured into a vessel loose state. Its volume subsequently determined to be 275 cm3. That same 400 g was then vibrated and tamped to a volume of 212 cm3 with Gs = 2.71. Determine the designation of the granular soil based on its relative density. (3 decimal places - Do not round off unless it's the final answer)
Geotechnical Engineering (UPVOTE WILL BE GIVEN. PLEASE ANSWER THE QUESTION CORRECLTY. NO LONG EXPLANATION NEEDED. FOLLOW THE INSTRUCTIONS CAREFULLY.) A moist soil weighed 895 g with a volume of 425 cm3. After drying, the sample weighed 775 g. Of the dried soil, 400 g was poured into a vessel loose state. Its volume subsequently determined to be 275 cm3. That same 400 g was then vibrated and tamped to a volume of 212 cm3 with Gs = 2.71. a. Determine the relative density of soil in %. b. Determine the designation of the granular soil based on its relative density.
As indicated in the following figure, an incompressible silty sand fill 16.4 ft thick wasplaced on top of a 49.2 ft thick layer of soft and compressible silty clay. Underlying theclay is a layer of incompressible sandy gravel. The soil properties of the silty clay layer aregiven in the following figure. The ultimate settlement, Sult = 5.64 ft, from the primaryconsolidation of silty clay layer due to the weight of the silty sand fill is calculated. A) Find the time rate of settlement by showing the Time [year] vs. Settlement [ft] curve.Show sample calculation when percentage of consolidation, Uavg = 50% B) Compute and plot effective stress profile (σ’z vs. depth) at the Silty Clay layer in thefollowing timing:a. Before placing the fill layerb. right after placing the fill layerc. Ten years after placing the fill layerd. 40 years placing the fill layerShow sample (hand) calculation at a depth of 41 ft and the timing of 10 years after placingthe fill layer. can you show your work on…
Given data: Depth of Clay layer =4Depth of Sand layer=2unit weight of clay kN/m3=23unit weight of sand kN/m3 =21Ø in both layers=30C´= 0
A layer of silty soil of thickness 5 m lies below the ground surface at a particular site and below thesilt layer lies a clay stratum. The ground water table is at a depth of 4 m below the ground surface.The following data are available for both the silt and clay layers of soil. Silt layer: ?10= 0.018 mm, e= 0.7, and Gs = 2.7Clay layer: e = 0.8 and Gs = 2.75Required: (a) Height of capillary rise, (b) capillarypressure, (c) the effective pressure at theground surface, at groundwater table (GWT)level, at the bottom of the silt layerand at a depth of H =6 m below groundlevel, (d) at a depth 2 m below ground level.(Sketch or draw the stress distribution diagram).