3. Laboratory Test Results3. Laboratory Test Results

Laboratory Test ItemsLaboratory Test Items

• Cylinder specimens, D=5cm, L=10cm, are used for laboratory test.

• Soil strength is determined by Unconfined Compression Test.

• The spectral characteristic is measured by optical spectrometer.

An example of weatheringAn example of weathering

Liaozhong Jing (Mar.30.2002)Liaozhong Jing (Mar.30.2002)

Weathering-induced surface changeWeathering-induced surface change

Start dayStart day

after 90 daysafter 90 days

after 120 daysafter 120 days

outdoor-exposure test using a cylinder specimen

deterioration process

deterioration process

caused by weathering

caused by weathering

Test CaseTest Case

Series NSeries N N0N0 N80N80 N90N90 N100N100

Number of dry-wet iterations

0 80 90 100

Weathering Progress

Series PSeries P P0P0 P80P80 P90P90 P100P100

Number of dry-wet iterations

0 80 90 100

Series N : without Relics Preservation Admixture (TOT) Series P : with Relics Preservation Admixture (TOT)

TOT has developed by Tanaka Geology Consultants, Co.Ltd.

Unconfined Compression Test ResultsUnconfined Compression Test Results-Series N (not used TOT)--Series N (not used TOT)-

0

1

2

3

4

5

0.0 0.5 1.0 1.5 2.0 2.5

Strain(%)

Stre

ss(M

Pa) N0

N1

N2

N3

deter

iorati

on pr

oces

s cau

sed b

y wea

ther

ing

deter

iorati

on pr

oces

s cau

sed b

y wea

ther

ing

The peak value of Stress is called Unconfined Compression Strength (soil strength).

Because of TOT effects, the peak values became larger than Series N.

0

1

2

3

4

5

0.0 0.5 1.0 1.5 2.0 2.5

Strain(%)

Stre

ss(M

Pa) P0

P1

P2

P3

Unconfined Compression Test ResultsUnconfined Compression Test Results-Series P (used TOT)--Series P (used TOT)-

deter

iorati

on pr

oces

s cau

sed b

y wea

ther

ing

deter

iorati

on pr

oces

s cau

sed b

y wea

ther

ing

Comparison of ResultsComparison of Results

0

1

2

3

4

5

0 80 90 100

Number of Wet-Dry Iterations

Unc

onfin

ed C

ompr

essi

on S

tren

gth(

MP

a)

Series N

Series P

Unconfined Compression Strength: Peak value of Stress on unconfined compression test result

0

200

400

600

800

1000

300 500 700 900 1100

Wavelength(nm)

Inte

nsity

(Cou

nt)

N0

N1

N2

N3

Spectral CharacteristicsSpectral Characteristics-Series N--Series N-

dete

rior

atio

n p

roce

ss c

ause

d by

wea

ther

ing

dete

rior

atio

n p

roce

ss c

ause

d by

wea

ther

ing

0

200

400

600

800

1000

300 500 700 900 1100

Wavelength(nm)

Inte

nsity

(Cou

nt)

P0

P1

P2

P3

Spectral CharacteristicsSpectral Characteristics-Series P--Series P-

dete

rior

atio

n p

roce

ss c

ause

d by

wea

ther

ing

dete

rior

atio

n p

roce

ss c

ause

d by

wea

ther

ing

0

200

400

600

800

1000

300 500 700 900 1100

Wavelength(nm)

Inte

nsity

(Cou

nt)

N0

N1

N2

N3

Relationship between Soil Strength and Relationship between Soil Strength and the Spectral Characteristicthe Spectral Characteristic

0

1

2

3

4

5

0.0 0.5 1.0 1.5 2.0 2.5

Strain(%)

Stre

ss(M

Pa) N0

N1

N2

N3

0

200

400

600

800

1000

300 500 700 900 1100

Wavelength(nm)

Inte

nsity

(Cou

nt)

P0

P1

P2

P3

0

1

2

3

4

5

0.0 0.5 1.0 1.5 2.0 2.5

Strain(%)

Stre

ss(M

Pa) P0

P1

P2

P3

Relationship between Soil Strength and Relationship between Soil Strength and the Spectral Characteristicthe Spectral Characteristic

0

1

2

3

4

5

300 400 500 600 700 800 900 1000

Number of Wet-Dry Iterations

Unc

onfin

ed C

ompr

essi

on S

tren

gth(

MP

a)

Series N

Series P

exponential relationship between them

This figure shows a possibility of soil state monitoring from satellite imageries.