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CMP 305 Exam Questions and Answers All Correct

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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 ...

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  • September 1, 2024
  • 17
  • 2024/2025
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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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