Baa4513 Chapter 1-2 1314 Dr Muzamirxx [Compatibility Mode]

8/12/2019 Baa4513 Chapter 1-2 1314 Dr Muzamirxx [Compatibility Mode]

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BAA4513 Foundation EngineeringChapter 1: Site Exploration and

Characterization

UNIVERSITI MALAYSIA PAHANGFaculty of Civil Engineering & EarthResources

Dr. Muzamir bin Hasan


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Types of Drilling Equipment


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Truck-Mounted Drill Rig

Typical Equipment

Used for

GeotechnicalDrilling

Truck Mounted Drill

Rig & Support Truck

(Water Tank)


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Field Drilling and Sampling

Air or Mud Rotary

Drilling


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Angle Drilling

Assess geologic

features (dip, strike,

joints, etc.) Foundation testing for

bridge abutments.


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Confined Access/ Interior Drilling

Limited Access DrillRigs are small in size,

but have the torque ofmany full size truck rigs.

Capability, boringdepths, size, etc. vary

Esp. useful for remedial

sampling


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Offshore Drilling/ Barge Rig

Exploration for

abutments,

bridges,docks, etc.


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Congested Busy Sites

Reliable underground utility

locate is critical

Traffic control is a must

Large percentage of effort

is in the planning

Special ordinances/

regulations may apply


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FACEBOOK GROUP:

BAA4513 FOUNDATION ENGINEERINGFKASA UMP 2013/14


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Books - Arrived


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Soil & RockDrilling & Sampling


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Drilling vs. Sampling

Think in terms of

a continuum

Many methods to

advance an

exploratory shaft

You get what you

pay for

Drilling

Sampling

Effort LOW HIGH

Cost LOW HIGH

Time LOW HIGH

Data LOW HIGH

Quality LOW HIGH

Samples NOTHING

CUTTINGS

CUTTINGSAT

DEPTH

CUTTINGSW/

PENETRATION

TEST

INTERMITTENT

DISTURBED

INTERMITTENT

UNDISTURBED

CONTINUOUS/

UNDISTURBED


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Drilling vs. Sampling

Drilling Just a hole no sample

DisturbedSampling

Estimating the nature of the formation from

the cuttings is like identifying the cow from the

hamburgers. G.F. Sowers

Undisturbed

Sampling Retrieve a continuous core Applicable to both soil and rock


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Drilling:

Rotary Bit

Bit at the end of drill rod rotated

and advanced

Soil/rock cuttings removed bycirculating drilling fluid

Common drilling fluid; bentonite

in water with slurry density 68-

72pcf Air may be used as drilling fluid


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Drilling:

Continuous Flight Auger


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Drilling & Sampling

Hollow Stem Auger

Casing with outer spiral

Inner rod with plug/or pilot

assembly For sampling, remove pilot

assembly and insert sampler

Typically 5ft sections, keyed, box

& pin connections

Maximum depth 60-150ft


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Drilling & Sampling

Hollow Stem Auger


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Drilling & Sampling

Rock Coring

Double-tube core barrel

is typical

Diamond or tungsten-

carbide tooth bit

Size of core samples

varies


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Drilling & Sampling

Rock Core Quality

Core recovery percentage

Rock Quality Designation

(RQD) Defines the fraction of solid core

recovered greater than 4 inches

in length

Calculated as the ratio of the

sum of length of core fragments

greater than 4 inches to the total

drilled footage per run,

expressed as a percentage


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Drilling & Sampling

Rock Core Quality


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Drilling & Sampling

Shelby Tube Sampler

Suitable for SOIL

Thin-wall Steel Tubes

3.0" OD, 2.875" ID, 30.0" long, 7.2lbs


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Ground Water


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Groundwater Monitoring

Groundwater level mustbe determined during

geotechnical exploration Measure at time of

drilling and later (24 hrs,1 week, etc.)

Can be accomplished byleaving selected soilborings open

Or, install a piezometer


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Ground Water

Piezometers

Monitor Wells &

Sampling Permeability Tests


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Chapter 2: Site Exploration and

Characterization; Part II

Subsurface material properties cannot bespecified; they must be deduced throughexploration.

Charles Dowding (1979)


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SOIL BORINGS

Purpose:

To establish the soil profile by observation of

cuttings recovered during drilling or byobtaining disturbed soil samples

To allow standard penetration testing at

various depths during pauses in the drilling

process


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SOIL BORINGS

To detect the presence of and estimate the

depth of the water table

To install sensors that can provide usefuldata during and even after construction


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SOIL BORINGS


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SOIL BORINGS


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SOIL BORINGS


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SOIL BORINGS

Baa4513 Chapter 1-2 1314 Dr Muzamirxx [Compatibility Mode]

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