Chapter 5

David Wagner 2007/06/29 15:40

Problem 1.

Vibratory compactors are most suitable for clean sand.

Problem 2.

Productivity: P={16.3WSLE}/P = {16.3*10*5*6*0.75}/8 =458

458 CCY/hr

Problem 3.

  1. Mechanical: Vibration
  2. Hydraulic: Surcharging
  3. Reinforcement: Soil Nailing
  4. Physiochemcial: Adding Lime, Cement, Fly Ash, Asphalt

Problem 4.

a. A compaction wheel is a small compactor similar to tamping or foot rollers normally mounted on the boom of a backhoe or hydraulic excavator.

b. The typical lift thickness for an excavator-mounted compaction wheel ranges fro 24 to 48 in. for excavators to 18 to 30 in. for backhoes.

c. The minimum pipe cover to use with an excavator-mounted compaction wheel is three ft for excavators and 2 ft for backhoes.

Problem 5.

  • Rammer/tamper
  • Vibratory plate
  • Vibratory roller
  • Compaction wheel
  • Vibratory compactor

Problem 6.

Well, I suppose the water content is much higher than optimum. Draining the cut would be a step in the right direction, and letting this silty sand sit a bit in the fill to let excess water drain off before attempting to compact it is probably a good idea as well.

Problem 7.

[{{2*12}/3} + {{2*12}/4} + {{2*15}/5} ]*{1/0.83}=19.8 hr, Peak at 14.5%

19.8 hr

Problem 8.

The field optimum moisture content may vary from laboratory measurements because the compactive effort delivered by a piece of compaction equipment is seldom exactly the same as that used in laboratory tests.

Problem 9.

Chapter 5 Problem 9
MCDENISTY
10109
12112
14116
16115
18110
20106

JpGraph Table Data Plot

Labority Optimum: 14.5% Moisture Content

0.9*117=105.3

90% Modified AASHTO Density: 105 lb/cf

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