CMP 305 Exam Questions and Answers All Correct
how to prevent losing coheasion and friction with a trench - Answer-spoil piles
trench stand up time depends on - Answer-depth
slope
fissures
soil type
soil moisture
location of water table
weather
surface surcharge
vibration
Option ...
CMP 305 Exam Questions and Answers
All Correct
how to prevent losing coheasion and friction with a trench - Answer-spoil piles
trench stand up time depends on - Answer-depth
slope
fissures
soil type
soil moisture
location of water table
weather
surface surcharge
vibration
Option to control soil moisture and water content - Answer-chemical stabilization
controlling soil moisture for small areas - Answer-remove and replace
controlling soil moisture for large areas - Answer-remove water
chemical stabilization with lime slurry mix
piles stabilize soil wall
Tension cracks happen at - Answer-horizontal distance of .5 to .75x depth of trench
Sliding may occur due to - Answer-tension cracks
function of soil type and moisture
Toppling happens when - Answer-trenches verticle face seperated at tension cracks
and roll into trench
subsidence and bulging happens when - Answer-an unsupported trench wall is
unbalanced causing surface to subsiden
heaving or squeezing - Answer-bottom shifting up caused by downward pressure
Boiling - Answer-upward flow of water into bottom of trench bc of water table
sheilding - Answer-holding back and supporting
Spoil Piles need to be - Answer-2 feet away from trench
and watch out for gas lines
only trust suction lines to lift - Answer-12-15'
,Protective systems - Answer-slope or bench
shore or support
shield
all shapes of soils - Answer-angular
subangular
rounded
why do angular particles have better engineering properties - Answer-less voids
Clay particle properties - Answer-very fine and layered flat
attracts water the most
charges for clay - Answer-mineral surface negative charge
edges have positive charge
sieves are used for what kind of soil - Answer-coarse grained
what do classification tests determine - Answer-direct physical sizing of material
and sedimentaion
sedimentation - Answer-process of settling
well graded - Answer-wide range of sizes
poorly graded - Answer-small range of sizes
what kind of soil is most suseptible to soil liquefaction - Answer-poorly graded
soil liquefaction - Answer-strength and stiffness reduced by high loads or vibrations
fine grained based on sieve - Answer-more than 50% passes through 200# seive
Dry strength test - Answer-Mold sample into ball and let dry, break ball with thumb and
finger
dry strength test if ball doesnt break - Answer-highly plastic
dry strength test if ball breaks - Answer-not very plastic
plasticity index depends on what - Answer-amount of clay present
plastic index indication - Answer-fitness of the soil and its capacity to change shape
without altering volume
, Clay properties vary in proportion to - Answer-water content
high water content in clay has ___________ Properties - Answer-liquid
Low water content and volume decrease in clay shows that it is - Answer-plastic
Atterberg limits evaluate - Answer-plasticity
atterberg limits used when - Answer-for dams, embankments,landfills,highways
atterberg limits determine - Answer-if building can be supported
Liquid Limit - Answer-soil water content expressed in % of dry unit weight
Liquid limit point - Answer-which soil will start to flow using the shake test ( more water
content)
Plastic limit - Answer-moisture content % at soil begins to crumble ( less water content)
Plastic index - Answer-numericle difference between liquid and plastic limits
plastic index represent - Answer-range in moisture content
In field devices - Answer-soil density devices
pocket penetrometer
turvane
pocket penetrometer measures - Answer-tons per square foot
in place density or in place unit weight refers to what - Answer-volumetric weight of soil
in undisturbed condition or compacted fill in pounds per square foot
IPD or IPUW only used for - Answer-coarse grained soils due to there being such a
difference in bank and compacted density and volume
The greater the density or unit weight the better the... - Answer-shear strength and less
tendancy for compression
borrow pit soils - Answer-an area to remove earth soils which will be used for fill
use unut weight or density tests to estimate - Answer-volume of shrinkage or swell that
will occur as the soil is transported
collapsible soils have - Answer-volume reductions when in contact with water
collapsible gravel has what change - Answer-volume
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