A novel technique to predict soil deformation
The geophysical method such as seismic surface wave offered advantages in the geotechnical site investigation via non-destructive testing. The geophysical methods have been widely used to detect any spatial material property changes which cannot be seen using naked eyes of human. Therefore, this res...
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| Main Authors: | , , , , , , , , , , |
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| Format: | Thesis |
| Published: |
2014
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/6913/ http://eprints.uthm.edu.my/6913/1/FRGS_1061.pdf |
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| Summary: | The geophysical method such as seismic surface wave offered advantages in the
geotechnical site investigation via non-destructive testing. The geophysical methods
have been widely used to detect any spatial material property changes which cannot be
seen using naked eyes of human. Therefore, this research focused on a development of
the seismic wave technique of surface wave with in situ non-destructive testing. The
method presented in this research is by obtaining the surface wave phase velocity of a
material in order to develop the graph of phase velocity versus wavelength. These
researches utilize two different seismic surface wave techniques in one seismic complete
system. The two seismic surface wave technique used is the Spectral Analysis Surface
Wave (SASW) and Continuous Surface Wave (CSW). This research explores the effect
of the relationship between source and receiver distance for both methods. The practical
testing has been conducted on known materials; where the CSW system has been used
on a concrete mortar. The ratio for this concrete mortar is 1 : 15; cement and sand and lm
x Im x 1.5m for its dimension. Meanwhile, the SASW system has been used to test for
soft soil conducted at RECESS soft soil test site in UTHM. The CSW method is based
on generating a mono-frequency source using piezoelectric transducers in order to
produce a seismic energy. For SASW method an impact source using a hammer is used
to generate the seismic energy. The seismic recording used in this research includes a
pair of accelerometer sensors and National Instrument data acquisition system. The
collected data were stored, and processed after the completion of a data acquisition
session. The portable personal computer with the developed Matlab programmed has
been used to control the SASW and CSW system and the data acquisition during site
investigation. The experimental result for phase velocity obtained in this research for
concrete mortar is average at 374.29 m/s between 0.5m to 0.6m wavelength. Meanwhile,
for SASW system the phase velocity of soil at a wavelength of 0.34m to 3.5m is average
at 75.03 mls. |
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