Example 2Twelve undisturbed soil samples were obtained fromborings in a proposed cut area. These samples had anaverage Yd of 108 lb/ft³ and an average w of 9.1%. Aproctor compaction test performed on a representativebulk sample produced Yd,max 124 lb/ft³ and w₁ = 12.8%.A proposed grading plan calls for 12,000 yd³ of cut, and11,500 yd³ of fill, and the specification call for a relativecompaction of at least 90%.=a) Compute the required quantity of import (or export)soils based on the unite weight of the cutb) Compute the weight of import (or export) in tons usingthe moisture content of the cutc) Compute the required quantity of water in gallons tobring the fill soils to the optimum moisture content

a) From the compaction test it is found that the maximum dry density is 124lb and the optimum…

Answered: Example 2 Twelve undisturbed soil…

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter12: Shear Strength Of Soil

Section: Chapter Questions

Problem 12.4P

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9. 8.5m compacted fill is to be placed over the soil profile. Cosnolidation tests are done on samples from point A and point B and produce the following results. Compute the ultimate consolidation settlement due to the weight of this fill in INCHES. 2.0 m Cc 7.0 m 18.0 m Cr 8.5m eo o P1010101010- Sample A 0.25 0.08 0.66 101 kPa Proposed fill = 20.3 kN/m³ Y= 18.3 kN/m³, Y = 19.0 kN/m³ y=19.5 kN/m³ 10.0 Glacial till 4.0 Sample B 0,20 0.06 0.45 510 kPa B Stiff silty clay (CL) Very stiff clay (CL)
A sand cone in place unit test was conducted on the field during the construction of the embanklment in CALAX. The following data were obtained in the field: Moisture content of soil from the test hole+ 12.8% ; Weight of sand to fill the funnel(cone) = 320g; Weight of weight soil from the test hole= 750g; Unit weight of sand= 15.4 kN/m3 and Weight of sand used to fill the test hole and thefunnel of sand-cone device=870 g. Compute for the relative compaction (in percent) in the field if the maximum dry unit weight of the soil is 21.30 kN/m3.
A proposed grading plan requires 223,120 m³ of cut and 206,670 m³ of fill. Laboratory tests on a series of undisturbed samples from the cut area produced the following results: Sample No. Dry Unit Weight (kN/m³) Moisture Content (%) 3-1 3-2 5-1 5-2 8-1 17.3 17.7 16.8 17.1 16.0 9.1 9.5 8.9 7.2 12.0 A series of modified Proctor tests on representative bulk samples produced a maximum dry unit weight of 19.2 kN/m³ and an optimum moisture content of 10.2%. The project specifications require a relative compaction based on the modified Proctor test of at least 90%. (a) Determine the shrinkage factor and compute the required volume of import or export, if any. Use the dry unit weight of the cut when computing any import or export quantities. (b) Determine the weight of any import or export soil, assuming it has a moisture content equal to the average moisture content in the cut. Express your answer in metric tons (1 metric ton = 1000 kg = 1 Mg).
The proposed grading at a project site will consist of 25,100 m³ of cut and 23,300 m³ of fill and will be a balanced earthwork job. The cut area has an average moisture content of 8.3%. The fill will be compacted to an average relative compaction of 93% based on a maximum dry unit weight of 18.3 kN/m³ and an optimum moisture content of 12.9% obtained from the modified Proctor test. Compute the volume of water in kiloliters that will be required to bring these soils to the optimum moisture content.
A sand cone in place unit test was conducted on the field during the construction of the embanklment in CALAX. The following data were obtained in the field: Moisture content of soil from the test hole+ 12.8% ; Weight of sand to fill the funnel(cone) = 320g; Weight of weight soil from the test hole= 750g; Unit weight of sand= 15.4 kN/m3 and Weight of sand used to fill the test hole and thefunnel of sand-cone device=870 g. Compute for the dry unit weight of the compacted soil in kN/m3. a.17.80 b.18.74 c.20.08 d.21.14
A sand cone in place unit test was conducted on the field during the construction of the embanklment in CALAX. The following data were obtained in the field: Moisture content of soil from the test hole+ 12.8% ; Weight of sand to fill the funnel(cone) = 320g; Weight of weight soil from the test hole= 750g; Unit weight of sand= 15.4 kN/m3 and Weight of sand used to fill the test hole and thefunnel of sand-cone device=870 g. Compute for the relative compaction (in percent) in the field if the maximum dry unit weight of the soil is 21.30 kN/m3. a.94 b.88 c.92 d.90 With FBD if necessary
Q5-A proposed earth dam requires 7500 m³ of compacted soil with relative density of 94%, maximum void ratio of 0.73, minimum void ratio of 0.4 and specific gravity (Gs)= 2.67. Two borrow pits are available as described in the following table. Choose the best borrow pit with a minimum cost. Borrow Pit A B Degree of saturation % 82 100 Moisture content % 18.43 24.34 Cost ($/m³) 10 5
4. Specifications require that a fill using borrow soil to be compacted at 95% of its standard proctor maximum dry density. Tests indicate that this maxi- mum is 19.5 kilo Newtons per cubic meter with 12 % moisture. The borrow material has a void ratio of 0.60. Compute the minimum dry and wet unit weight of the compacted soil, compute also the minimum volume of borrow material required to fill 1 cubic meter when compacted. Note: Assume a logical value of Gs with at least 4 significant figures.
Example 1 A sand come test has been performed in a competed fill made with the soil described in 21 example 6.1 20 Ydmax 19.0 kN/m³ 19 95% (Yd,max) 18 17 =18.1 kN/m³ S=100% Wo -11.8% 16 0 5 7% 10 w (%) 15 16% 20 25 Initial mass of sand cone apparatus = 5.912 kg Final mass of sand cone apparatus = 2.378 kg Mass of soil recovered from hole = 2.883 kg Moisture content of soil from hole = 7.0% Density of sand = 1300 kg/m³ Volume of cone below valve = 1.114 x 10-3 m³
Note : Answer only four questions Q1 - A) Field density test performed on granular soil has given the following results ; Pfield = 1.81 g/cm³ ,W% = 12.7, G; = 2.65 , emax= 0.81 and pmax=1.9 g/cm³. Compute the relative density (compaction percentage ). -B) prove the following: 1) pa Gs Pw 1+8 14hat the
A soil sample was taken from the ground of a project after it has been compacted by a contractor, the data of the soil sample are: (w=13.6%, Gs=2.78, yfield=19.4 kN/m3) if the specifications of the compaction require the maximum porosity is (40%) Did the contractor achieve the specification? (explain the reason)
A laboratory modified Proctor compaction test gave: optimum water content 16 % and maximum dry density pPdmax= 1.74 gm/cm3. If the specifications require that at least a relative compaction of 95% and a water content should be: optimum water content +2%. A field density test gave the following values: the volume of the hole was 1165 cm. The mass of wet soil removed from the hole is 2230 gm and the water content is 20.41%. Does the test meet specifications? Why? Paragraph BIEBE

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