The advantages and disadvantages of site investigation tools and exploratory technique

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

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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

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CN 301 – GEOENVIROMENTAL ENGINEERING

cont.

BAILER

• No power source needed portable.

• Inexpensive

• High maintenance• Heavy

ADVANTAGES DISADVANTAGES

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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

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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

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CN 301 – GEOENVIROMENTAL ENGINEERING

cont.

EXPLORATORY TECHNIQUE

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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

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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

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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

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CONCLUSION

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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