CMP 305 Final Test with Correct Answers
What does subsurface determine - Answer-What can be built on the soil, foundation requirement's
Split Barrel Test or SPT - Answer-Tube that goes into ground to collect soil sample
DRIVEN for 3, 6" increments
Use last two results and add them for sum...
CMP 305 Final Test with Correct
Answers
What does subsurface determine - Answer-What can be built on the soil, foundation
requirement's
Split Barrel Test or SPT - Answer-Tube that goes into ground to collect soil sample
DRIVEN for 3, 6" increments
Use last two results and add them for summation
Shelby Tube - Answer-A thin-walled, PUSH-tube sampler that obtains undisturbed
samples of cohesive soils.
Compaction - Answer-the process by which sediments are pressed together under their
own weight
Increases soil density
Compaction Forces - Answer-Vibration, Weight, Manipulation, and Impact
Consollidation - Answer-Increases density of saturated material by removing water from
voided spaces (could take months-years)
In-place density tests - Answer-liquid, sand, nuclear
Backfilling - Answer-The process of refilling trenches or holes created during
excavation, especially around foundations. Need to know material and how much
material.
Sheet Piles - Answer-Must be deep enough in the soil to hold the load.
Borrow Pit Method - Answer-1- Find Elevations and Cut of soils
2- Fill in chart with the cut of the soils
3- Find H1, H2, H4 from chart (H1 is corners, H2 is outside of chart besides corners,
and H4 is the middles)
, 4- Use formula A(1(h1)+2(h2)+4(h4))/(4)(27) for A use 1 GRID size
Average Height Method - Answer-1- Find Elevations and Cut of soils
2- Fill in chart with the cut of the soils
3- Find H1, H2, H4 from chart (H1 is corners, H2 is outside of chart besides corners,
and H4 is the middles)
4- Use formula A*h(avg.)/27 for A use full LOT size, for h add H1, H2, and H4 and
divide by number of grid boxes
Frost Heaves - Answer-- Water freezes during winter and produces a lens of ice
beneath the particles because the particles conduct the cold. The cold, ice expands by
9% and pushes outwards.
-Prevent with better drainage, new soil, or heating of the soil
Plastic Limit - Answer-Moisture content at which soil starts to crumble
Special Numbers - Answer-Mile = 5280ft
Acre = 43,560sf
Section = 640 acres
Water weight = 62.4 lbs/cf
Plastic Index - Answer-Numerical difference between liquid and plastic limits
Liquid Limit - Answer-Expressed as a % of dry weight
Point at which soil will start to flow and not compact
Dripline - Answer-Minimum protection around a tree
Trench Safety - Answer-Slope, Shore, Shield
5' deep requires shoring
4' deep required egress every 25' (ladder, stairs, board)
If using ladder, must go 3' above hole
Spoil pile 2' back from edge of hole
Proctor Test - Answer-Evaluates soil moisture density in relation under compaction
effort
Modified Test
Used for high density loads
Determines max dry unit weight
Optimum Moisture Content - Answer-The moisture content at which the maximum dry
unit weight of soil is attained
Moistures greatest influence on compaction
Greatest densification with least amount of work
Sheep's Foot Roller - Answer-Best for a colloidal soil condition
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