forensic geotechnical investigation and ... -...
TRANSCRIPT
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FORENSIC
SITE INVESTIGATION
&
INSTRUMENTATION
Ir. Dr. Mohd Farid Ahmad DFY Consult & CSL Soil Centralab
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SESSION 1: SITE INVESTIGATION & INSTRUMENTATION
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SITE INVESTIGATION
SOIL INVESTIGATION SURFACE INVESTIGATION
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SOIL INVESTIGATION
• To study the general suitability of the site for a construction method or an engineering project (feasibility studies)
• To enable a safe, practical and economical design to be prepared.
• To determine the possible difficulties may be encountered by a specific construction method.
• To study the suitability of construction material (soil or rocks).
OBJECTIVES
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STANDARD PENETRATION TEST (SPT)
• The most economical means of obtaining subsurface information
• A split barrel sampler 450 mm long is driven by a free falling 65 kg hammer.
• The first 150 mm is called the seating drive and not counted.
• The total cumulative no. of blow counts for the last 300 mm is recorded as N-value
OBJECTIVES
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Geological nature of the site
Type of information required
Factors influencing selection of S.I. methods
Topographical nature of the site
Financial constraint
& time
restriction
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SOIL INVESTIGATION
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SOIL INVESTIGATION
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SPT HAMMER
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SPLIT BARREL SAMPLER
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CPT CONE
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WATER PUMP
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CASING SHOE
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DRILL BIT
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CPT MACHINE
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CPT LOGGING
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INCLINOMETER
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SETTLEMENT GAUGE
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SETTLEMENT GAUGE
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Types of Triaxial Tests Depending on whether drainage is allowed or not during
initial isotropic cell pressure application, and
shearing,
there are three special types of triaxial tests that have practical significances. They are:
Consolidated Drained (CD) test
Consolidated Undrained (CU) test
Unconsolidated Undrained (UU) test
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Types of Triaxial Tests
Under all-around cell pressure c
Shearing (loading)
Is the drainage valve open? Is the drainage valve open?
deviatoric stress ()
yes no yes no
Consolidated sample
Unconsolidated sample
Drained loading
Undrained loading
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PERMEABILITY TEST
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TRIAXIAL COMPRESSION TEST
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EXTRUDING OF SAMPLE
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STORAGE
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SURFACE MARKER
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PIEZOMETER
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MAGNETIC EXTENSOMETER
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INCLINOMETER
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SAMPLING TUBE
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MACKINTOSH PROBE
• Results are used to determine thickness of unsuitable material to be removed and also for preliminary design of embankments.
• Usually carried out near hand auger or deep boring positions and filling areas to verify the consistency of subsoil.
OBJECTIVES
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• Light dynamic test
MACKINTOSH PROBE
• Cone is driven directly into the soil by driving a hammer (5 kg) through a free drop of 280mm.
• The results are recorded as number of blows per 300mm penetration.
• Maximum penetration is 12m or 400blows/300mm; whichever comes first.
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Mackintosh Probe
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LABORATORY TESTS
• Laboratory testing of soil and rock should be as recommended in BS5930:1999.
• Testing should be carried out in
accordance with BS1377:1990.
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LABORATORY TESTS
• Triaxial load cells are the most widely used laboratory shear strength test for fine soils, allowing control of drainage conditions and porewater measurements.
• The test specimen is obtained from carefully extruded undisturbed tube samples.
SHEAR STRENGTH
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LABORATORY TESTS
UNCONSOLIDATED, UNDRAINED With no drainage allowed, which gives an initial in situ
condition.
SHEAR STRENGTH
CONSOLIDATED UNDRAINED With drainage allowed, until consolidation is complete,
then continue undrained with porewater pressure measurements.
DRAINED With drainage allowed throughout the consolidation and
shearing stages.
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LABORATORY TESTS
UNDRAINED STRENGTH Given in total stress terms (cu and øu).
SHEAR STRENGTH
DRAINED STRENGTH Given in effective strength terms (c’ and ø’).
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LABORATORY TESTS
LABORATORY OEDOMETER TEST – (ONE DIMENSIONAL LOADING) Used to determine the coefficient of volume compressibility
(mv) of clays and silts, from which the coefficient of consolidation (Cv) is obtained.
These two coefficients enable the magnitude and rate of
consolidation under full structural applied load to be estimated.
CONSOLIDATION
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SEIVE ANALYSIS TESTS
To determine grain sizes distribution. OBJECTIVE
How? Sieving are performed by arranging various sieves one over the other in the order of their mesh openings, the
largest aperture sieve being kept at the top and the smallest aperture sieve at the bottom.
Distributions of gravel and sand particles are determined by sieve analysis; meanwhile clay and silt
are determined by sedimentation or wet analysis.
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LABORATORY TESTS
ATTERBERG LIMIT TESTS
PLASTIC LIMIT TESTS
LIQUID LIMIT
TESTS
SHRINKAGE LIMIT
TESTS
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LIQUID LIMIT TESTS
LIQUID LIMIT TESTS
CASAGRANDE METHOD CONE PENETRATION METHOD
To determine liquid limit soil in percentage. OBJECTIVE
Liquid Limit? Moisture content at point of transition from plastic to
liquid state. `
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PLASTIC LIMIT TESTS
To determine plastic limit soil in percentage. OBJECTIVE
Plastic Limit?
Moisture content at point of transition from semisolid to plastic state.
When the soil is rolled into threads of 3.2mm diameter it start to crumbles.
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SHRINKAGE LIMIT TESTS
To determine shrinkage limit soil in percentage. OBJECTIVE
Shrinkage Limit?
Moisture content at which volume of soil mass ceases to change.
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SPECIFIC GRAVITY TESTS
To determine specific gravity of soil. OBJECTIVE
Specific gravity?
Ratio of weight of certain volume of soil solids to the weight of an equal volume of distilled water at a
constant temperature.
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INSTRUMENTATION
the proper type of instrument?
How to choose
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How? Qualifications
Required accuracy
Cost involved
Environmental and
operational conditions
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Magnetic Extensometer
Standpipe Piezometer
Vibrating Wire Piezometer
Inclinometer
INSTRUMENTATION
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PIEZOMETER
To monitor water level (static, perched, artesian) in excavations, slopes and dam embankments, to measure excess hydrostatic pressure beneath dams and embankments and to aid in control preloading operations and placement of fill over soft ground.
OBJECTIVE
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PIEZOMETER
OPEN SYSTEM Measurement are made from the surface and the water level is generally below the surface.
DIVIDED INTO
2 SYSTEMS
CLOSED SYSTEM Measurement are made remotely and the wate level may be at any location.
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STANDPIPE PIEZOMETER
OPEN SYSTEM
APPLICATION Coarse-grained granular soils, free-draining rock masses. ADVANTAGE Simple, rugged, inexpensive DISADVANTAGE Indicates average head, relatively insensitive, time lag in impervious soils.
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CLOSED SYSTEM
APPLICATION Fine-grained soils and slow-draining rock masses. ADVANTAGE Extreme sensitive, fast response, continuous recording possible
DISADVANTAGE Relatively costly, decreased durability and reliability over other closed systems because of electrical circuitry.
VIBRATING-WIRE PIEZOMETER
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Real Time Monitoring System
Vibrating Wire Piezometer (VWP)
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VIBRATING WIRE PIEZOMETER
Pore Water Pressure/Ground Water
Table Monitoring.
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INCLINOMETER
To measure lateral deflections
APPLICATIONS
• Installed behind retaining structures or in pile foundations.
OBJECTIVE
• Beneath loaded areas over soft soils
• Monitor slope movements
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INCLINOMETER
INSTRUMENTS
• Contains servo-accelerometers that can detect lateral movements of the order of ± 0.0001 ft per 2ft of casing.
• Since the voltage output is proportional to the sine of the angle of inclination of the long axis of the sensor, from the vertical, it can be used to measure true deviations from vertical.
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INCLINOMETER
INSTALLATION
• Is lowered and raised in specially grooved casing installed in a borehole and extended to a depth below the anticipated movement zone.
• The casing bottom is often grouted into place to assure fixity.
• For monitoring pile and wall movements, the casing is attached directly to the structural member.
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In-Place Inclinometer
Real Time Monitoring System
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IN-PLACE INCLINOMETER
Monitoring Of The
Lateral Movement.
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Instrumentation Details
Inclinometer- Sign Convention
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Instrumentation Details
Inclinometer
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Instrumentation Details
Magnetic Extensometer
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Surface Marker
Ground Marker
Visual Marker
Other Field Monitoring