Question 1: Earth whose in situ weight is 112 pcf, whose loose weight is 95 pcf and whose compacted weight is 120 pcf is placed in a fill at the rate of 250 cy/hr, measured as compacted earth. The thickness of the compacted layers is 6 inch. A compactor with a roller drum width of 84 inch is used to compact the material at a speed of 3.5 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. O 1 Roller O 3 Rollers O O Roller O 2 Rollers

Question 1: Earth whose in situ weight is 112 pcf, whose loose weight is 95 pcf and whose compacted weight is 120 pcf is placed in a fill at the rate of 250 cy/hr, measured as compacted earth. The thickness of the compacted layers is 6 inch. A compactor with a roller drum width of 84 inch is used to compact the material at a speed of 3.5 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. O 1 Roller O 3 Rollers O O Roller O 2 Rollers

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter2: Geotechnical Properties Of Soil

Section: Chapter Questions

Problem 2.4P

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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.
An earth dam needs to be compacted to reach 1.84 g/cm' at 15% water content. The field unit weight before compaction of the earth dam soil is 1.77 g/cm', the moisture content is 8% and specific gravity is 2.7. What is the amount of soil required to construct one cubic meter of the earth dam after compaction?
The following are given for a natural soil deposit: Moist unit weight, γ = 17.8 kN/m3 Moisture content, w = 14%; Gs = 2.7 This soil is to be excavated and transported to a construction site for use in a compacted fill. If the specification calls for the soil to be compacted at least to a dry unit weight of 18.4 kN/m3 at the same moisture content of 14%, how many cubic meters of soil from the excavation site are needed to produce 20,000m3 of compacted fill?
The following technical data are given below: Overburden pressure = 180KPa Increase in pressure = 140KPa Clay thickness = 8m Compression Index = 0.315 Void ratio = 1.132 What is the total settlement in clay?
Data for field density by sand cone method: Weight of bottle + cone + sand before going to the field = 8990.5 g Weight of soil excavated from hole = 7550 g Weight of bottle + cone + sand after use = 2931 g Weight of sand required to fill the cone, Wc = 1578 g Dry unit weight of sand = 1.533 g/cm3 Moisture content = 6% 1- Calculate dry unit weight of compaction in the field.
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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
The relative compaction of a sand in the field is 93.5%. Given the dry unit weight maximum= 16.98 kN/m3 and the dry unit weight minimum = 14.46 kN/m3. What is the water content of the sand in percent if the moist unit weight is 18.42 kN/m3? a.17.1 b.16.0 c.15.2 d.14.3
Refer to Figure 7.28. For the construction of an airport, a large fill operationis required. For the work, the average permanent load, (p), on the claylayer will increase by about 70 kN/m2. The average effective overburdenpressure on the clay layer before the fill operation is 95 kN/m2. For the claylayer, which is normally consolidated and drained at top and bottom, H = 5 m, Cc = 0.24, e0 = 0.81, and cv = 0.44 m2/mo.a. Determine the primary consolidation settlement of the clay layer causedby the additional permanent load, (p).b. What is the time required for 90% of primary consolidation settlementunder the additional permanent load only?c. What temporary surcharge, (f), will be required to eliminate the entireprimary consolidation settlement in 6 months by the precompressiontechnique?
A proposed earthen dam will contain 5,000,000 m3of earth. Soil to be taken from a borrow pit will becompacted to a void ratio of 0.78. The void ratio ofsoil in the borrow pit is 1.12. Estimate the volume ofsoil that must be excavated from the borrow pit. Include phase diagrams.
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