IDENTIFICATION OF SLOPE FAILURE USING 2-D RESISTIVITY METHOD
A study has been conducted to analyze the slope failures features and the factors that contribute to the landslide occurrence at Restu, Saujana and Tekun (RST) Complex, USM by using the 2-D resistivity method. Five survey lines were conducted with 100 m length and 2.5 m minimum electrode spacing....
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| Main Authors: | , , , |
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| Format: | Conference or Workshop Item |
| Language: | English |
| Published: |
2018
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| Subjects: | |
| Online Access: | http://eprints.usm.my/39578/1/ICENS_paper_publish.pdf http://eprints.usm.my/39578/ |
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| Summary: | A study has been conducted to analyze the slope failures features and the factors that contribute to the landslide
occurrence at Restu, Saujana and Tekun (RST) Complex, USM by using the 2-D resistivity method. Five survey lines were
conducted with 100 m length and 2.5 m minimum electrode spacing. The data obtained were transferred into the computer for
further processing and was presented in 2-D resistivity inversion model via Res2Dinv and Surfer vl1.0 software. The
inversion models convey the subsurface structure on each line in which was represented by the resistivity values. The range
of resistivity values were determined and classified into three classes for interpretation. The saturated zones, weathered
granite and fresh granite were classified with range values of 1-400 Qm, 1500-5000 Qm and greater than 5000 Qm
respectively. The saturated zones may compose of alluvium in which commonly consist of clay, silt and sand. Other features
such as presence of boulders was indicated by isolated high resistivity values, boulders overlie saturated zone and presence of
fracture were also determined as indicated by the resistivity variations of the inversion models. These features can be the
influence to trigger the landslide event in the early stages. Apart from precipitation as a major factor of the phenomenon, slope
angle can also be one of the important factors to be aware to determine slope stability. Precipitation can affect the soil strength
and texture while the slope angle can determine slope's class oflandslide risk. This study area has been classified ofhaving
higher risk oflandslide event. |
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