Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 6, Problem 6.11P
(a)
To determine
Find the volumes of each borrow pit soil required to meet the specification of the embankment site.
(b)
To determine
Find the most cost effective borrow pit.
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A proposed embankment fill requires 7500 m3 of compacted soil. The void ratio of thecompacted fill is specified as 0.7. Soil can be transported from one of the four borrowpits, as described in the following table. The void ratio, specific gravity of soil solids,and the cost per cubic meter for moving the soil to the proposed construction site areprovided in the table.a. Determine the volume of each borrow pit soil required to meet the specification ofthe embankment site.b. Make the necessary calculations to select the borrow pit which would be most costeffective.
A proposed embankment fill requires 7500 m³ of compacted soil. The void
ratio of the compacted fill is specified as 0.7. Soil can be transported from one
of the four borrow pits, as described in the following table. The void ratio,
specific gravity of soil solids, and the cost per cubic meter for moving the soil
to the proposed construction site are provided in the table.
a. Determine the volume of each borrow pit soil required to meet the spec-
ification of the embankment site.
b. Make the necessary calculations to select the borrow pit which would be
most cost-effective.
Borrow pit
Void ratio
GS
Cost ($/m³)
I
0.85
2.66
11
II
0.92
2.69
III
1.21
2.71
9
IV
0.89
2.73
10
Q
A proposed embankment fill required 8000 m3 of compacted soil. The void ratio of the compacted fill is specified to be 0.6. Four available borrow pits are shown below along with the void ratios of the soil and the cost per cubic meter for moving the soil to the proposed construction site. Make the necessary calculations to select the pit from which the soil should be brought to minimize the cost. Assume Gs to be the same for all borrow-pit soil.
Chapter 6 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- The sieve analysis data for a granular soil are given below. • % passing 76.2 mm sieve = 98 • % passing 4.75 mm sieve = 63 • % passing 0.075 mm sieve = 16 What would be the percentage of gravel by the AASHTO classification system? Answer:arrow_forwardA proposed earth fill for a construction of a US highway requires 371,000 cubic feet of soil. The soil will be compacted to a void ratio of 0.75 when it will be placed on the fill. There are 5 borrow pits (see table below). Which barrow pit will have the highest volume of soil for the project and what is the volume in cubic meters? Which borrow pit will provide the least cost, and how much is it?arrow_forwardDefine /Enumerate and explain the following. Definition of hydraulic conductivity and its magnitude in various soils. Note: This is not an assignment question and not a graded questionarrow_forward
- The results of a compaction test on the sample of soil that are to be listed are to be used for an embankment on a highway project are listed below . Determine the maximum dry unit weight of compaction and the optimum moisture content. The table is shown in imagearrow_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_forwardClassify the given soil to be used as highway subgrade material using the AASHTO Method by using the attached table for its classification. Sieve analysis % finer No. 10 Sieve = 47% %3D No. 40 Sieve = 28% No. 200 Sieve = 9% Plasticity for the minus NO.40 fraction LL = 0 PI = 2%arrow_forward
- Classify the given soil to be used as highway subgrade material by using the AASHTO method. Sieve Analysis (% Finer) No. 10 sieve = 100% No. 40 sieve = 72% No. 200 sieve = 39% Plasticity of fraction passing No. 40 sieve Liquid Limit = 44 Plasticity Index = 24arrow_forwardA borrow pit’s soil is being used as earth fill at a construction project. The in-place dry density of the borrow pit soil is known to be 1,825 kg/m3. The job contract requires the soil at the construction site to be compacted to adry density of 1,975 kg/m3. The project requires 12,000 m3 of compacted soil fill. What volume of soil will the earthmoving contractor be required to obtain from the borrow pit to provide the necessary volume of compacted fill?arrow_forwardGEOTECHNICAL ENGINEERING: The Undisturbed soil at a given borrow pit is found to have the following parameters. The water content is 15%, the void ratio is 0.60 and the specific gravity of the solids is 2.70. The soil from this borrow pit is to be used to construct a rolled fill having a finished volume of 50,000 yd3 . The soil is excavated by means of a shovel and dumped on trucks. When loaded to capacity these trucks are found to contain, on average, a net weight of wet soil equal to 13,000 lbs. In the construction process, the trucks dump their load on the fill, the material is spread and broken up, after which a sprinkler adds water until the water content is equal to 18%. The soil and water are thoroughly mixed by means of dicers (or other similar equipment) and then compacted until the dry unit weight γd=110 lbs/ft3. Helpful Conversions (3ft=1yd), (γw=62.4 lbs/ft3), (7.48gal/1ft3 ) a) Assuming that each load is a capacity load, how many truck loads are required to construct the…arrow_forward
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