A proposed grading plan requires 223,120 m³ of cut and 206,670 m³ of fill. Laboratorytests on a series of undisturbed samples from the cut area produced the following results:Sample No.Dry Unit Weight(kN/m³)Moisture Content(%)3-13-25-15-28-117.317.716.817.116.09.19.58.97.212.0A series of modified Proctor tests on representative bulk samples produced a maximumdry unit weight of 19.2 kN/m³ and an optimum moisture content of 10.2%. The projectspecifications require a relative compaction based on the modified Proctor test of at least90%.(a) Determine the shrinkage factor and compute the required volume of import orexport, if any. Use the dry unit weight of the cut when computing any import orexport quantities.(b) Determine the weight of any import or export soil, assuming it has a moisturecontent equal to the average moisture content in the cut. Express your answer inmetric tons (1 metric ton = 1000 kg = 1 Mg).

a. Shrinkage factor = 1.29%Required import= 13783.95 m3 b. Weight of import soil = 26095.75 metric…

Answered: A proposed grading plan requires…

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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A 50 mm diameter and 90 mm-long silty clay sample was subjected to a falling head permeameter test using a setup similar to the one shown in Figure 6.4b, where the inner diameter of the standpipe was 3.0 mm. The head dropped from 870 mm to 450 mm in 5 minutes. What is the permeability of the sample?
For a soil specimen, given the following: % passing sieve #4-92 %, sieve #10 -81%, sieve # 40-78%, LL-48%, PL-16%, GI-18.2 classify the soil by AASHTO classification system. GI = (F200-35)[0.2 + 0.005 (LL - 40)] +0.01 (F20015)(PI – 10)
Classify the soil sample using AASHTO Classification System. Passing No. 10 = 89 % Passing No. 40 = 64 % Passing No. 200 = 48 % Plasticity for the minus No. 40 fraction: Liquid Limit = 36 % Plastic Limit = 27 % O GI = 2.0 O A-6 (2) O A-5 (0) O A-4 (2) O A-7-5 (0) O GI = 1.0 O GI = 0
3. A falling head permeability test is performed on a fine gravel soil. The soil sample has a length of 120mm and cross-sectional area of 600mm?.The water in the standpipe flowing into the soil is 0.60m above the top of the sample at the start of the test. It falls 50mm in 30 min. The standpipe has a cross- sectional area of 200mm?. a. Make a sketch of the described condition. b. What is the coefficient of permeability in millimeters per second? c. What is the coefficient of permeability in feet per minute? d. On the basis of the calculated value for k, what is the probable soil type?
The following results of a falling head permeability test. Calculate the permeabilityof the soil sample Diameter of sample: 100 mmDiameter of feeder pipe: 20 mmLength of sample: 500 mmFlow through the sample: 1.3 l/sDistance between tappings: 450 mmHead loss: 1650 mm
The table below shows the results of CU test for a soil sample (h=76 mm, and D= 38 mm), Find the X value, if you know the decrease in VO=2.5 % in consolidation stage. Shearing stage (ho=75 mm) Axial dial gauge reading (F=0.01 mm/div.) Corrected area mm 30 75 120 no one O 1133 mm2 1105 mm2 O 1110 mm2 O 1176 mm2
2.32 A mud retort analysis of a 16-lbm/gal fresh- water mud indicates a solids content of 32.5% and an oil content of zero. Methylene blue titrations of samples of mud, bentonite clay, and drilled solids indicates a CECm of 6 meq/ 100 mL, a CEC, of 75 meq/100 g, and a CECds of 15 meq/100 g. Determine (1) the total volume fraction of low-gravity solids, (2) the volume fraction of bentonite, and (3) the volume fraction of drilled solids. Answer: 0.0745; 0.0198; and 0.0547.
|Laboratory testing was performed on two soil samples (A and B). (a) Determine the USCS classification symbol for Sample A. (b) Determine the AASHTO classification for Sample B. Sieve No. Sieve Opening (mm) A- Percent Passing B - Percent Passing 3 inch 76.2 100 1.5 inch 38.1 98 0.75 inch 19.1 96 4 4.75 77 100 10 2.00 96 20 0.85 55 94 40 0.425 73 100 0.15 30 200 0.075 18 55 Liquid Limit 32 52 Plastic Limit 25 32 A Silty Clay (CL) sample was extruded from a 6-inch long tube with a diameter of 2.83 inches and weighed 1.71 lbs. (a) Calculate the wet density of the CL sample. (b) A small piece of the CL sample had a wet weight of 140.9 grams and a weight of 85.2 grams after drying. Compute the water content. (c) Compute the dry density of the CL sample A Standard Proctor test was performed on a soil with a specific gravity of 2.71. For the water content and wet soil unit weight in the following table: a) Plot the moisture-dry unit weight curve b) Find the maximum dry density and optimum…
Two types of compaction tests are typically performed in the laboratory. These tests are the standard proctor test and the modified proctor test. O True False
A constant head permeability test is performed on soil that is 4 cm2, and 2.5cm long. The head difference applied during the test is 20 cm and 7 cm3 is collected over a time of 100 sec. Provide step by step solution. What is the permeability based on these test conditions and results.
The data from a falling head test is shown Diameter of the standpipe = 3cm Initial head = 91.77 cm duration of the test = 18 mins length of the soil sample = 32.98 cm diameter of the permeameter = 44 cm If the soil permeability id 0.005cm/min, determine the final head (in cm) of the permeability test.
(b) Table Q2(b)(i) shows the proctor compaction test results of bulk density andpercentage of water content conducted in geotechnic laboratory. The test isperformed on a subgrade soil sample with the specific gravity of solid is2.75. Based on the statement;(i) With the plot of graph, compute the maximum dry density andoptimum moisture content.(ii) Compute the range percentage of moisture content needed to achieve95% of relative compaction effort. (iii) Based on the answer in Q2(b)(ii), explain how the density of soil canbe improve if the compaction effort not achieve to 95%.

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