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CMP 305 Exam 1 Questions with Revised Answers Updated
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CMP 305 Exam 1 Questions with Revised Answers Updated Equipment for in place density - Answer-- sandcone: bottle, sand cone, density - balloon apparatus - nuclear moisture density gage: gamma rays inject into the soil then reads the amount of rays reflected back Differential Leveling - Answ...

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  • September 1, 2024
  • 10
  • 2024/2025
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CMP 305 Exam 1 Questions with Revised
Answers Updated

Equipment for in place density - Answer-- sandcone: bottle, sand cone, density
- balloon apparatus
- nuclear moisture density gage: gamma rays inject into the soil then reads the amount
of rays reflected back

Differential Leveling - Answer-Finding difference in elevation between 2 points

Profile leveling - Answer-determining the elevation of points at measured distances
along a selected line

Topographic leveling - Answer-determining the elevation of spaced grid points
- uses contour lines

Soil structure - void Ratio - Answer-how much space there is between each particle
- the greater the range in particle sizes the smaller the void ratio (good for building)

coarse soil - void ratio - Answer-- in loose condition high void ratio
- likely to have quick volume changes and loss of strength when subject to vibration
(when in loose fill)

collapsible soil - Answer-- volume reduction of soils when in contact with water
- collapsible gravel = volume change
- sand can shift, saturated sand is unstable

montmorillonite materials - Answer-- expansive swelling clays
- high volume change
- irregular plate shape
- weak bonds between layers make it easy to absorb water between layers

Expansive Force - Answer-- can lift pavements
- lateral forces: pressure on walls from expansion

volume decrease usually do to... causes... - Answer-decrease in water content....
settlement

options when encountering undesirable soil - Answer-Small area: remove it

Large area:

, - remove it$$
- chemical stabilization: lime slurry mix
- piles/ caissons

Bentonite clay - Answer-good for well drilling

Soil trafficablility - Answer-ability of soil to support the weight of vehicles under repeated
traffic

Soil load ability - Answer-measure of difficulty in excavating and loading soil
- high load ability: loose granular soils
- low load ability: compacted soils

units for soil weight - Answer-- lbs/ per cubic foot
- lbs/cy
- tons/cy

Soil volume characteristics: Bank - Answer-- Material in its natural state
- units: BCY, bank cubic yard


Types of Leveling - Answer-- Differential Level
- Profile
- Topographic

Accuracy of differential leveling depends on...
and common mistake - Answer-- centering of bubble
- keeping the rod vertical
- equal sight distances for the BS and FS
- length of sight: be practical
-common mistake: reading wrong foot mark

Types of Levels - Answer-construction level
self compensating

construction level - Answer-- dumpy 10-20x
- simple
- straight line measurements

self compensating - Answer-- easier to use
- what we use in lab

Transit and theodolites - Answer-- both work in the horizontal and vertical plane
- rotate angles
- vertical measurements
- transit is more traditional, few automated features
- theodolite can read angles ver y accurately of up to 1 sec of an arc

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