GPR survey for subsurface utility mapping at proposed metro station in Ahmedabad


Scope of Work:

GPR survey execution for mapping underground utilities to ensure safety of pre-existing assets during pile construction.


Ahmedabad, Gujarat, India.


Ranjit Buildcon Limited.


GSSI SIR-3000 equipped with 100 MHz, 200 MHz and 400 MHz antenna


uneven accessibility to the area to be surveyed


The GPR survey has been carried out at proposed metro route near Motera station, Ahmed- abad. The total area scanned was approximately 3200m2 on a road. The scope of work includes the mapping of possible underground utilities up to the depth of around 8 m using non-destructive Ground Penetrating Radar technology. The purpose of the project was to map all the underground utilities and to attain a clear underground space to install the piers for the proposed metro route. However, the main focal point of the survey was to map the alignment of deeper sewer drain in order to better plan the construction work of the metro route as well as preventing the damage to the existing sewer drain. Considering the client's requirements and the expected depth of the utilities, the area has been surveyed using three different center frequency antennas i.e. 100 MHz, 200 MHz and 400 MHz mounted with SIR 3000 GPR system to cover the depth up to 8 m with the fair resolution. The purpose of the survey was to map all the underground utilities viz. cables, water lines, gas lines, sewer line etc. up to the depth of 8 m using non-destructive technology. The whole data is collected depending on the site condition and maximum accessibility of the road. Numerous parallel profiles have been collected across the width of the road at a spacing of 3 m. Overall 12 utilities are found to exist at different depth range. The alignment of observed utilities agreed with the information available from client's end. No other utility is found to be exist at this greater depth than 5.3 m.

GPRcase study-rbl
GPRcase study-rbl
GPRcase study-rbl