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Imaging near-surface defects using step-frequency ground-penetrating radar

DSpace at IIT Bombay

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Title Imaging near-surface defects using step-frequency ground-penetrating radar
 
Creator BALASUBRAMANIAM, VR
JHA, PC
CHANDRASEKHAR, E
 
Subject UNDERGROUND CAVITIES
TRACE ANALYSIS
REFLECTION
GRAVITY
PULSE
 
Description Step-Frequency GPR (SFGPR) investigations were carried out at the location of a crude oil storage tank at a petroleum refinery. The storage tank was founded on an elevated platform (tank-pad). Subsidence of a portion of the tank-pad led to cracking of its bottom steel plates and subsequent leakage of crude oil. SFGPR imaging was done within and outside the tank, in the frequency range of 10-260 MHz, to understand the cause of the subsidence. Complex signal analysis was useful in identifying a series of cavities in the subsurface, in the depth range of 2-15 m, close to the location of subsidence of the tank-pad. In order to stabilize the foundation of the tank, the subsurface area infested with cavities was grouted systematically. SFGPR imaging was done again after grouting, in the same area in the same manner to evaluate the efficacy of grouting and check for presence of remnant cavities. Results of the SFGPR investigations, before and after grouting, which aided restoration of the foundation of the oil tank, are discussed.
 
Publisher EUROPEAN ASSOC GEOSCIENTISTS & ENGINEERS
 
Date 2014-10-17T05:15:33Z
2014-10-17T05:15:33Z
2013
 
Type Article
 
Identifier NEAR SURFACE GEOPHYSICS, 11(1)19-27
http://dx.doi.org/10.3997/1873-0604.2012044
http://dspace.library.iitb.ac.in/jspui/handle/100/16042
 
Language en