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cn301-geoenviromental engineering
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PREPARED BY GROUP 4
CIVIL ENGINEERING DEPARTMENT
THE ADVANTAGES AND DISADVANTAGES OF SITE INVESTIGATION TOOLS AND EXPLORATORY TECHNIQUES
GEOENVIROMENTAL ENGINEERING
CN 301
KARLOFF LUKIN 07DKA10F2030SABRI ARIP 07DKA10F2050GEORGE B. MAJUNTING 07DKA10F2147ABDUL MUHAIMIN B. INGGU 07DKA10F2149JEREMIAH DANIEL LUBASAH 07DKA10F2153
GROUP MEMBER:
INTRODUCTION
CN 301 – GEOENVIROMENTAL ENGINEERING
To describe the advantages and disadvantages of site investigation tools and exploratory techniques.
CN 301 – GEOENVIROMENTAL ENGINEERING
INTRODUCTION
SITE INVESTIGATION TOOLS
CN 301 – GEOENVIROMENTAL ENGINEERING
EARTH AUGER
Can be manually turned, handheld device or powered by an electric motor or internal combustion engine.
Can reach to 109- 110dB. (noisy)
ADVANTAGES DISADVANTAGES
CN 301 – GEOENVIROMENTAL ENGINEERING
CN 301 – GEOENVIROMENTAL ENGINEERING
cont.
BAILER
• No power source needed portable.
• Inexpensive
• High maintenance• Heavy
ADVANTAGES DISADVANTAGES
CN 301 – GEOENVIROMENTAL ENGINEERING
CN 301 – GEOENVIROMENTAL ENGINEERING
cont.
SPRING STEEL FINGERS
A finger like device installed at the bottom of the aluminums core tube called a core catcher prevents sediment from falling out of the tube.
Any loose, sandy sediments more difficult to retain in a core tube.
ADVANTAGES DISADVANTAGES
CN 301 – GEOENVIROMENTAL ENGINEERING
CN 301 – GEOENVIROMENTAL ENGINEERING
cont.
SPLIT SPOON SAMPLER
• Easy to obtain samples in unconsolidated materials above 100ft.
• Produce vey good quality samples for both lithological description and chemical analysis.
• Relatively efficient and inexpensive at shallow and intermediate.
• High maintenance• Need skill
workers.
ADVANTAGES DISADVANTAGES
CN 301 – GEOENVIROMENTAL ENGINEERING
CN 301 – GEOENVIROMENTAL ENGINEERING
cont.
EXPLORATORY TECHNIQUE
CN 301 – GEOENVIROMENTAL ENGINEERING
GRAB SAMPLING
• Low cost• Quick • No access
restrictions• Minimal soil
disturbance
• Depth limit: surface- 0.5m
• Impractical in difficult soil conditions
• Care is required to ensured the quality of sample recovered
ADVANTAGES DISADVANTAGES
CN 301 – GEOENVIROMENTAL ENGINEERING
HAND AUGER, SPLIT BARREL DEVICES
• Low cost • Quick • No access
restrictions• Minimal soil
disturbance
• Depth limit: 2-3 m (with ease)
• Impractical in difficult soil conditions
• Care is required to ensured the quality of sample recovered
• Limited ability to observe the nature of the material
• Labour intensive
ADVANTAGES DISADVANTAGES
CN 301 – GEOENVIROMENTAL ENGINEERING
TEST PITS
• Lower cost than boreholes
• Relatively quick• Ability to make
detailed observations of the strata
• Ability to recover samples
• Extent of soil disturbance, occupational exposure, compaction
• Depth limit: 3-5m depending on excavator
• Impractical in unstable soil conditions and hard rock
• Not suitable for installing monitoring bores due to disturbance
ADVANTAGES DISADVANTAGES
CN 301 – GEOENVIROMENTAL ENGINEERING
BOREHOLE
• Minor disturbance of soils• Limited occupational
exposure• Accurate recovery of
samples• Ability to sample at depth• Suitable for most ground
conditions • Can be used for installing
groundwater and gas monitoring wells
• More expensive than other techniques
• Limited ability to observe materials
• Air rotary rigs not suitable for volatiles
• Can cause preferential pathways for contaminant migration, if not appropriately constructed
ADVANTAGES DISADVANTAGES
CN 301 – GEOENVIROMENTAL ENGINEERING
CONCLUSION
CN 301 – GEOENVIROMENTAL ENGINEERING
Peralatan untuk penyiasatan tapak adalah penting untuk mendapatkan data yang diperlukan sebelum memulakan apa-apa pembinaan. Peralatan masing-masing mempunyai kelemahan dan kelebihan tersendiri. Kesilapan tidak semestinya daripada peranti tetapi ia juga daripada kecuaian manusia.
CN 301 – GEOENVIROMENTAL ENGINEERING
CONCLUSION
