Characterization of soft soil using multi-channel analysis of surface waves (MASW) and electrical resistivity method (ERM)
This thesis demonstrates the research on the soft soil characteristics using geophysical methods. The need on non-intrusive, time efficient, economic and larger volume of investigation had increased the demand of using geophysical methods for geotechnical investigation. The research concentrates on...
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| Format: | Thesis |
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2017
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| Online Access: | http://eprints.uthm.edu.my/9872/ http://eprints.uthm.edu.my/9872/1/Kasbi_Basri.pdf |
| Summary: | This thesis demonstrates the research on the soft soil characteristics using geophysical
methods. The need on non-intrusive, time efficient, economic and larger volume of
investigation had increased the demand of using geophysical methods for geotechnical
investigation. The research concentrates on the determination of soft soil shear-wave
velocity (Vs) profile using the multi-channel analysis of surface waves (MASW) and the
soil stratigraphy using Electrical Resistivity Method (ERM). The soft soil Vs and
stratigraphy were determined and correlated with the peat sampler and borehole data to
obtain more accurate data. The research was conducted at Parit Nipah and RECESS
UTHM. The Vs obtained for peat and soft clay at Parit Nipah was in the range of 29.7 to
34.9 m/s and 36.8 to 76.9 m/s respectively. While, the soft clay Vs obtained at RECESS
was in the range of 64.4 to 124.0 m/s. The lower Vs obtained on peat compared to soft
clay was due to the heterogeneity of peat. The soil strata obtained by ERM had good
agreement with the peat sampler and borehole data. The resistivity value of peat and soft
clay obtained at Parit Nipah was in the range of 47.2 to 127.7 ohm.m and 9.4 to 25.8
ohm.m correspondingly. While, at RECESS soft clay, the resistivity value was in the range
of 1.0 to 4.6 ohm.m. The lower resistivity value of soft clay was governed by the amount
of clay fraction which was related to cation exchange capacity (CEC). As higher CEC
results in higher conductivity. The relationship obtained between the 1-D Vs and 1-D
resistivity value shows that consistent value of peat Vs was followed by the slight decrease
in peat resistivity value. While, drastic increase in soft clay Vs results in a significant
decrease in soft clay resistivity value. This concluded that stiffness does not produce
significant effect on the soil resistivity. Overall, MASW and ERM produced high quality
data for subsurface investigation in larger volume with timely efficient manner and more
economic. |
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