Inspection of Masonry Canal using GPR at Lonavala, Maharashtra

 

Scope of Work:

GPR investigation to inspect the structural integrity of over 100 year’s old Masonry Canal at Lonavala

Location:

Lonavala, Maharashtra

Client:

Bureau Veritas India LTD

Equipment:

GSSI StructureScan Mini with 1600 MHz center frequency antenna

Challenges:

Uneven wall surface and some proposed locations on height were difficult to access

Summary:

The GPR survey has been carried out on Canal wall at 16 different proposed chainage locations along the canal in Lonavala, Maharashtra. The scope of the work included the mapping of voids or any other discrepancies in masonry canal wall, up to the depth of around 1-1.5 m using non-destructive Ground Penetrating Radar Technology. The survey is done to assess the structural integrity of the canal wall and to evaluate the damages or deterioration that might have developed in masonry structure over the time. Considering the client's requirements and the expected thickness of the structure, 16 different locations has been surveyed using GSSI StructureScan Mini with a 1600 MHz center frequency antenna to cover the depth up to 1.0 m with superior target resolution. The area of 60 cm X 60 cm is scanned each of these 16 locations with GPR. At each location, the data is collected in 3D grid pattern of 5 cm X 5 cm spacing in longitudinal and transverse direction of the wall. The general detailed layout of one (similar at all 16 locations) location is shown in Figure.

 
GPRcase study-GPR survey at BVIL
GPRcase study-GPR survey at BVIL
GPRcase study-GPR survey at BVIL