Earth - whose in situ weight is 112 lb/cu ft, whose loose weight is 95 lb/cu ft, and whose compacted weight is 120 lb/cu ft - is placed in a fill at the rate of 250 cy/hr measured as compacted earth. The thickness of the compacted layers is 6 inches. A compactor with a roller drum width of 84 inches is used to compact the material at a speed of 2.5 mph. Assume a 55-min hour operating efficiency. Determine the number of rollers required to provide the necessary compaction if 8 drum passes are specified for each layer of earth.

Earth - whose in situ weight is 112 lb/cu ft, whose loose weight is 95 lb/cu ft, and whose compacted weight is 120 lb/cu ft - is placed in a fill at the rate of 250 cy/hr measured as compacted earth. The thickness of the compacted layers is 6 inches. A compactor with a roller drum width of 84 inches is used to compact the material at a speed of 2.5 mph. Assume a 55-min hour operating efficiency. Determine the number of rollers required to provide the necessary compaction if 8 drum passes are specified for each layer of earth.

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Consolidation

Section: Chapter Questions

Problem 9.12P

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Earth-whose in situ weight is 112 lb/cf, whose loose weight is 95 lb/cf, and whose compacted weight is 120 lb/cf-is placed in a fill at the rate of 250 cy/hr, measured as compacted earth. The thickness of the compacted layers is 6 in. A compactor with a roller drum width of 84 in. is used to compact the material at a speed of 2.5 mph. Assume a 55-min hour operating efficiency. Determine the number of rollers required to provide the necessary compaction rate if eight drum passes are specified for each layer of earth.
Repeat Problem 16.6 with the following:D50 = 3.2 mmD20 = 0.91 mmD10 = 0.72 mm
5.5 Earth whose in situ weight is 105 lb/cf and whose compacted weight is 122 lb/cf isplaced in a fill at the rate of 260 cy/hr, measured as compacted earth. The thickness of thecompacted layers is 7 in. A roller having a drum width of 50 in operates at a speed of 2mph. Assume a 55-min hour operating efficiency. Determine the number of rollersrequired to provide the necessary compaction if four passes are specified for each layer ofearth.
Backhoe 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/hr
I need an answer. Asap ty subject: Soil mechanics (geotechnical engineering)
A measure of density of a compacted fills as part of the specification requirement was performed by digging a hole in the soil, weighing the extracted soil and measuring the volume of the hole. The soil (moist) weighed 770 grams. 420 g of the dried soil was poured into a vessel in a very loose state. Its volume was subsequently determined to be 280 cm. The same 410 grams of dried soil was then vibrated and tamped to a volume of 220 cm. If the specific gravity of the soil sample is 2.7, compute the void ratio in the densest state. Select one: a. 0.37 b. 0.45 C. 0.73 d. 0.54 The saturated unit weight of a soll is 19.49 KN/m°, and the specific gravity of the soil solids is 2.7. What is the void ratio of the soil? Select one: a. 0.91 b. 0.72 c. 0.57 d. 0.83
2. (a) 2 kg of dry sand is poured into a Eureka can, where it displaces 755 cm³ of water. Calculate the specific gravity of the sand particle. (b) When a 2 kg of the same sand is poured into a measuring cylinder of diameter 6 cm, it occupies a total volume of 1200 cm³. Calculate the void ratio of the sand and its unit weight in this state. (c) The measuring cylinder is carefully filled with water up to the level of the top of the sand, so that the total volume is still 1200 cm³. Calculate the unit weight of the saturated sand in this condition. (d) The side of the measuring cylinder is tapped gently several times, and the level of the sand surface settles to an indicated volume of 1130 cm³. Calculate the void ratio and the unit weight of the saturated sand in its dense state. Take the unit weight of water yw as 10 kN/m³, and the mass density of water as 1000 kg/m³.
Most of the compaction in the field is conducted with rollers. Which one of the followings rollers consider for light soil compacting O Vibro tampers O Pneumatic rubber-tired roller O Sheep foot roller O Smooth wheel roller
3- The time for 65% consolidation of a 1.12-inch clay specimen (drained at top and bottom) in the laboratory is 12 minutes. How long will it take (in days) for a 15-ft-thick clay layer in the field to undergo 35% consolidation under the same pressure increment? In the field, there is a rock layer at the bottom of the clay.
A sample from the field has an in-situ void ratio of 0.680 and were tested in the laboratory and found that the specific gravity is 2.550. The sample is compacted to a void ratio of 0.480 and the relative density is determined to be 58.120%. It was then oven-dried and compacted again, but this time to its densest possible state and the recorded mass and the volume are 425.870 grams and 205.370 cubic centimeters. Determine the following: maximum void ratio, relative density of the soil , volume of the soil after first compaction
Will a grit particle with a radius of 0.10 mm and a specific gravity of 2.65 be collected in a horizontal grit chamber that is 13.5 m in length if the average grit-chamber flow is 0.15 m³/s, the width of the chamber is 0.56 m, and the horizontal velocity is 0.25 m/s? Hint: Use the data below S-1 V's= 18 v=0.959 x 10-6 m²/s
Based on the compaction curve shown in Figure A (below), choose the appropriate combination for each parameter Av = (i) Av = (ii) Av = 10% (iii) Sr = (iv) O i = 5%; ii = 12%; iii = OMC; iv = 95% O i = 7%; ii = 12%; iii = MDD; iv = 100% %3D O i = 0%; ii = 6%; iii = MDD; iv = 100% %3D %3D O i = 0%; ii = 7%; iii = OMC; iv = 95% %3D