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Resistivity determination of railway track’s subgrade
Anas Ibrahim1, Azura Ahmad2, Muhammad Luqman Azuddin Fitri3, Noryani Natasha Yahaya4, Faizah Kamarudin5, Muhammad Sofian Abdullah6.
The conventional geotechnical investigation method using borehole drilling
and sampling was usually performed for subsurface exploration. However,
it is -time-consuming, invasive and requires the closing of railway lanes that
disrupts the train service. To avoid this problem, a geophysical method is an
alternative that can be proposed to assess the conditions of the soil subgrade
under the railway track. Electrical resistivity is one of the geophysical
methods that study the nature of the electricity flow in the soil by injecting
the electric current into the soil and measuring the generated potential
difference. The field investigation was conducted at two different locations
using electrical resistivity methods to identify the properties of the soil. Two
railway track site locations selected were Pinang Tunggal, Pulau Pinang
(KM 23), and Alor Setar, Kedah (250 m from the station in the north
direction). ABEM Terrameter LS was used in field work that applied two
configurations of an array,the Wenner and Schlumberger arrays, to infer the
subsurface soil layer. The results concluded that the apparent resistivity data
need to be inverted into an actual resistivity data set using Resistivity 2D
Inversion (RES2DINV) software. The analysis found that the soil properties
are both classified as soft soil with electrical resistivity values ranging from
0 - 100 Ω-m.
Affiliation:
- Universiti Teknologi MARA Cawangan Pulau Pinang, Kampus Permatang Pauh, Malaysia
- Universiti Teknologi MARA Cawangan Pulau Pinang, Kampus Permatang Pauh, Malaysia
- Universiti Teknologi MARA Cawangan Pulau Pinang, Kampus Permatang Pauh, Malaysia
- Universiti Teknologi MARA Cawangan Pulau Pinang, Kampus Permatang Pauh, Malaysia
- Universiti Teknologi MARA Cawangan Pulau Pinang, Kampus Permatang Pauh, Malaysia
- Universiti Teknologi MARA Cawangan Pulau Pinang, Kampus Permatang Pauh, Malaysia
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