Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 5, Problem 5.9P
To determine
Find the total surcharge during the period of 6 months.
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surcharge of 1000 lb/ft?? Assume C, = 1/6 C.
8.6 A soil profile is shown in Figure 8.23. The preconsolidation pressure is 3400 lb/ft?. Estimate
the primary consolidation settlement that will take place as a result of a surcharge
Ao = 1500 lb/ft. Assume C, = 1/5 C.
%3D
%3D
Aa
Dry sand
90=2
G, = 2.65
10 ft
Groundwater table
Sand
10 ft-
G, = 265
Clay
10 ft
W= 30%
G,= 2.7
Liquid limit=35
Rock
Figure 8.23
aning. All Rights Reserved. May not he copied, scanned or duplicated in whole or in
Due to olectrIGK nhu scme third parry COnent may be suppressed inm the eBook andoreChupters
• Problem 2. You are tasked with constructing a rolled fill with a total volume of 35,000 m^3. The borrow that you will use has soil with
w=15%, bulk unit weight= 19.1 kN/m^3; Gs=2.75. The trucks that will move the soil have a capacity of 4.80 m^3. The compaction
specification of your construction project are w=18% and dry unit weight=17.3 kN/m^3.
a) Assuming that each load is at full capacity, how many truckloads are required to construct the fill?
b) What should be the volume of the pit that remains in the borrow area, after all the material required from the fill has been removed?
c)
How many liters of water will have to be added per truck load, assuming that the moisture lost by evaporation, hauling, and excavation is
negligible?
A soil profile consists of a sand layer 2m thick, whose top is the ground surface, and a clay layer 3m thick with
an impermeable boundary located at its base. The ground water table is at the ground surface. A widespread
load of 150kPa is applied at the ground surface. Assume that the soil is in a normally consolidated state.
Calculate the consolidation settlements at 3 months, 6 months and 2 years if the load is increased linearly to
100kPa over 6 months.
Ysand(sat)= 21 kN/m³, Yclay(sat) = 17 kN/m³, eo=1.5 C₂=0.5 c=5.5m²/year
Chapter 5 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- Refer to Figure 2, estimate the primary consolidation settlement in the clay layer. Given: Ag = 85 kN/m²; Hi = 2 m; H2 = 4 m; and H3= 6 m. Soil characteristics are as follows: Sand: ydx 14 kN/m³, Ysat 18 kN/m³ Clay: LL = 54; e = 0.98; Ysat 19 kN/m'; Cs =- Cc 150 kN/m? H3 Sand Clay ョ→arrow_forwardWeight of structure W.T. Sand layer H2 Clay layer Н as Compacted sand- gravel layer figure 1arrow_forwardIn the soil profile shown below, the clay is normally consolidated and H,=9m, H2=5m, H3=3m. The depth of water table is then decreased so that H;=2m, H2=12m, H3=3m. a) Calculate the overconsolidation ratio (OCR) at this stage. When a surcharge of Ao = 180 kPa applied to the surface. b) Estimate the primary consolidation settlement of the clay layer. c) Estimate the degree of consolidation will be after 40 days? d) How many days would it take for 90% consolidation? Soil characteristics are as follows (use appropriate relations from the Appendix, 9.81 kN/m³): Yw = Sand: e = 0.56; G, = 2.6 Clay: LL = 63; e = 0.83; G, = 2.77; C, = - Cc; Cy = 6.66 × 10-4cm² /s %3D Ao H1 Sand Groundwater table Sand H2 Clay. Void ratio = e H3 Normally consolidated Sandarrow_forward
- 1. A soil profile is shown in the figure.A uniformly distribute d load of 50 Kpa is applied at the ground surface. Assume Cs= 1/5 Cc. What is the settlement of the clay layercaused by primary consolidation if: a. The clay is normally consolidate d b. The preconsolidation pre ssure, de= 210 Kpa c. The preconsolidation pressure, o.= 150 Kpa Ap = 50 kPa Sand 3 m Yay = 16 kN/m? Ground water table 6 m Sand Ya = 18.5 kN/m Clay Yar = 19 kN/m e = 0.95 LL = 50 8 m Sand Figure 06.4arrow_forward5. Calculate the consolidation settlement of the clay layer in the soil profile shown below due to a surcharge of Ao-25 kPa. What would be your suggestion to reduce this settlement? Assume the unit weight of water to be 10 kN/m³. B m SANDY 20 kN/m² CLAY Y18 kN/m OCR-1.2 C-0.05 Ce-0.45 -0.9 GWarrow_forwardEstimate the primary consolidation settlement in the clay layer. Given: Ao= 85 kN/m²; H1 = 2 m; H2 = 4 m; and H3 = 6 m. Soil characteristics are as follows: Sand: e = 0.65; Gs = 2.66 • Clay: LL = 54; e = 0.98; Gs = 2.74 ; Cs = 1/6 Cc.arrow_forward
- Refer to Figure Q3. Estimate the primary consolidation settlement in the clay layer. Given: Δ? = 85 ??/?2 ?1 = 2 ? ?2 = 4 ? ?3 = 6 ?. Soil characteristics are as follows (use appropriate relations):• Sand: ? = 0.65; ?? = 2.66• Clay: ?? = 54;? = 0.98; ?? = 2.74; ?'c = 150 ??/?2; ?? = 1/6 ?carrow_forwardQUESTION 1: PHASE RELATIONS a. The bulk unit weight and water content of a soil at a borrow pit are 17.2 kN/ml and 8.2% respectively. A highway fill is being constructed using the soil from this borrow at a dry unit weight of 18.05 kN/m³. Find the volume of the borrow pit that would make one cubic meter of the finished highway fill. b. A soil to be used in the construction of an embankment is obtained by hydraulic dredging of a nearby canal. The embankment is to be: placed at a dry density of 1.72 t/m³ and will have a finished volume of 20,000 m³. The in situ saturated density of the soil at the bottom of the canal is 1.64 t/m³. The effluent from the dredging operation, having a density of 1.43 t/m³, is pumped to the embankment site at the rate of 600 L per minute. The specific gravity of the soil grains is 2.70. i. ii. How many operational hours would be required to dredge sufficient soil for the embankment? what would be the volume of the excavation at the bottom of the canal? c. A…arrow_forwardBackhoe excavator worked for 45 hours to excavate and stock the required earth volume to be loaded by apayloader to a fleet of 5-dump trucks, which haul the earth to site where it is compacted on a shrinkage factorof 20%. Each truck has a total cycle time of 15 minutes, assuming it does not have to wait in line to be loaded.The earth has a percent swell of 25%. The job requires a compacted volume of 30,000 m 3 done by a road grader,roller compactor and water tanker in 70 hours. Calculate the direct equipment total cost spent considering thefollowing? a. Payloader capacity – 220 m 3 (bank volume) of common earth per hour.b. Dump trucks capacity – 20 m 3 (loose volume) each unitc. Payloader rental rate – ₱650/hourd. Dump truck rental rate – ₱180/houre. Backhoe rental rate – ₱800/hourf. Road grader rental rate = ₱ 550/hrg. Roller compactor rental rate – ₱750/hourh. Water tanker rental rate – ₱ 120/hrarrow_forward
- Refer to Figure 11.40. Given: H = 5 ft, H2 = 7 ft, H3 = 6 ft, and Ao = 3000 lb/ft. Also, • Clay: e = 1.1, G, • Sand: e = 0.58, G, = 2.65 %3D %3D = 2.72, LL = 45 %3Darrow_forward1. A soil profile is shown in the figure. A uniformly distributed load of 75kPa is applied at the ground surface. The clay is normally consolidated. Compute the secondary settlement 8 years after the completion of primary consolidation. Time for completion of primary settlement is 2 years. Assume secondary compression index = 0.025arrow_forwardYour company has won a contract to provide and compact the fill material for an earth levee, with the dimensions shown below. The levee fill is a silty clay soil to be compacted to at least 95% of maximum Standard Proctor of ya = 106 pcf at an OMC of 18%. Your borrow pit has a silty clay with an in-situ moist density of 112.1 pcf at 18%, and a G, = 2.68. When the soil is excavated and loaded on to your trucks, the voids ratio of the material is e = 1.47. Your trucks can haul 15 cubic yards of material per trip. (26) Determine the volume of fill required for the levee; (27) Determine the volume required from the borrow pit; (28) Determine the required number of truckloads. 40* 20 -20 20 450 60' 3:1arrow_forward
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