CMP 305 Final Exam Questions With
Revised Answers
What do surface & subsurface features determine? - answer- What can be built on site
- Foundation req
What factors are necessary for planning construction techniques? - answer-
Surface/subsurface features
- Site access
- Equip type
- Ground ...
What do surface & subsurface features determine? - answer✔✔- What can be built on site
- Foundation req
What factors are necessary for planning construction techniques? - answer✔✔-
Surface/subsurface features
- Site access
- Equip type
- Ground water (or if surface water develops)
What info needs to be collected for surface evaluation? - answer✔✔- Soil maps
- Topographic maps
- Aerial photos
- USGS topographic quadrangle maps
- USDA soil conservation maps
What features can be observed from bird's eye view of maps? - answer✔✔- Land patterns
- Sink holes
- Drainage patterns (low areas)
What things should you check when visiting a site? - answer✔✔- Water level
- Existing wells
- Water marks
- Underground utilities
- Talk to residents
Subsurface evaluation - answer✔✔To define vertical & horizontal boundaries of soils/rock under
the site
- Obtain lab samples @ various depths
- Locate ground water table
- Aid in equip selection
- Safety equip (hazard analysis)
2 Types of soil exploration - answer✔✔1. Direct exploration
2. Semi-direct exploration
Devices used in direct soil exploration? - answer✔✔- Test pit
- Shelby tube
- Split barrel
- Pocket penetrometer (TSF)
- Torvane
- Thumb penetration
Devices/techniques used in semi-direct soil exploration? - answer✔✔- Auger drilling
- Rotary drill
- Wash-boring
- Drilling rock
- Cone penetrometer
Test pit - answer✔✔Direct observation of subsurface material, limited to shallow exploration
- Pit or trench: visual inspection (15'-20')
- Back hoe: excavator
Adv:
- view soil profile (type, color)
- obtain undisturbed sample
Disadv:
- limited depth
Auger drilling - answer✔✔Hand, truck-mounted
Types:
- solid: dry regions (no ground water), removed for sample, collapse hole
- hollow: faster (split barrel, shelby tube), stem acts as casing
Disadv:
- disturbed sample from the auger
Rotary drill - answer✔✔Auger w/ clay slurry
- slurry moves soil up
- slurry stabilizes sides of drill hole
Wash-boring - answer✔✔Drill/jet water, casing required
Adv:
- small unit
Disadv:
- disturbed sample, don't know original location/water content
Drilling rock - answer✔✔Drill - sample
- soft rock: drill
- hard rock: diamond (carbide tip)
Rock quality designation (RQD): rock sample tested to determine strength
Cone penetrometer - answer✔✔Pushed into ground
- records readings for different sections
Adv:
- provides continuous record of test results
- provides eng. prop. for entire soil profile
Disadv:
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