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GPR News July - September 19

GPR Field Methods for Minimizing Site Impact (Part 1)

It is possible to minimize environmental impacts and greatly reduce site costs through improved efficiency by employing Ground Penetrating Radar (GPR) field methods. This article will detail how GPR data collected from several Australian projects was used to minimize site impacts and provide trenchless solutions. In each project, GPR was used along with other techniques to reduce the amount of excavation and non-destructive digging (NDD) required with a hydro-vac or dry suction. 

 

GPR field methods will include but are not limited to: 

  • Initial scanning with GPR to locate assets and detect any unknown objects prior to excavation or NDD. 
  • On-site interpretation of GPR data as it is collected to understand key locations and site conditions to decide on an excavation or NDD strategy.
  • Using selective core hole drilling to confirm asset location or tap into the existing asset to install a new connection or water stop.
  • Reporting and post-processing of GPR data to document key locations and the methods used.

An overall strategy for GPR scanning will be outlined to enable these methods to be applied to future projects.

Approaching a Project

  • GPR Field Methods Used
    -  Initial Scanning
    -  On-Site Interpretation
    -  Excavation or NDD - Selective Core Hole Drilling with Dry Vac
    -  Reporting and Post Processing
  •  Leads to overall strategy…

Application 1: Estimating Projects

Project 1: Ground Conditions & Depths

Looking for a position for a new pipe with minimal digging.

1) Electronically located looking for conduits to confirm depth
2) Cores to figure out material in some areas
3) GPR to see if the whole area is consistent

GPR scanning reveals:
• Old asphalt (150mm thick) transition to deep lift asphalt (400mm thick).
• Ground conditions remain same. Coring provided info that it was sandstone, not sand or clay.


 

Augmented Reality (AR) Telling the Story in the Field 

Data without interpretation or context is just data. Where data becomes useful is when user's head into the field with an application and the data they collect gives a clear picture of the problem and possible causation. AR allows the user to project data into the real world. It allows the user to see the hidden features alongside the features we can see on the surface. 

In this application we have a pavement with severe cracking. Technicians tasked with testing the lab used GPR to investigate if reinforcing (or lack thereof) was the root cause of the issue. After scanning an area 600 x 600mm the technician created an area scan which is a plan view of the reinforcing in the slab.
 
Historically marrying this data with the location of the crack would have been pretty meticulous. Potentially a crack map would have been generated and the area scan either projected on to the area or next to it for the client to interpret. All of this would have required the technicians to perform a report in the office, marrying painstaking measurements, photo, and GPR data. AR allowed the technicians in this instance to project the data onto the area in the field.
The resulting image is striking and fairly obvious for any engineer to interpret. The crack has occurred at the intersection of 2 slightly misaligned mats of mesh. There is no lapping of the mats and this indicates to the engineer a construction defect.
The time saving from this exercise carried out in this manner makes it easy to see that Industry 4.0 tools like AR are not just toys. AR is a serious tool for the technician to illustrate a point with little effort something that could have taken a few hours, in minutes. No one can dispute the issue and the technician can move onto another project.
 
Click on Image to find out more: 
 

 

 

VIC:

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