Publication: Joint 2-d seismic refraction and electrical resistivity surveys in subsurface characterization at twin bore tunnel of electrified double track project (edtp)
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Date
2012-06-01
Authors
Abdul Raof, Mohd Afiq Fazli
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Abstract
The construction of a twin bore tunnel for the Electrified Double Track Project (EDTP) across the North-South Highway (PLUS) may affect the structure. One of the most severe problems that could be face is the settlement of the soil profile. This may cause major loss to the company and even the country. Thus, a joint 2-D seismic refraction and electrical resistivity survey were conducted in order to study the subsurface soil and groundwater features at the cross section area of the two structures. The main objective of the study is to investigate the subsurface and groundwater profile at the particular area. The correlation will be used to determine the changes in subsurface soil conditions before and after the construction of the tunnel. In seismic refraction survey, one survey line consists of 24 geophones was established. The result was recorded using a geodes and the processed by using SeisImager software that operate on a controller (laptop). The result which is seismic refraction modelling image was later interpreted and correlate with the borehole log. For electrical resistivity survey, the subsurface conditions were analyse by using different method of array (Dipole-dipole, Schlumberger and Wenner arrays) in a single line. The line consist of 31
electrodes that connected by cables to the resistivity meter (Allied Tigre Resistivity Meter). The measure resistivity value will be processed by using Imager Pro 2006 software. For this particular study, Dipole-dipole arrays were chosen for further analysis and refinement process. The refined modelling image also will be correlate with the borehole log. Finally, all three different study methods results will be correlate to each other. Even though there is a slight contradiction noticed from correlations been made, the geophysical methods can be concluded as an effective technique to determine the subsurface soil and groundwater features.