What is quality assurance and control monitoring?

Installation of a trenchless PRB is typically monitored during injections by the active resistivity method to map its geometrical extent and ensure inclusion coalescence or overlap between adjacent wells. This monitoring program qualitatively verifies that the reactive barrier is constructed as planned, with no gaps or voids.

 

How does quality assurance and control monitoring work?

During injections, the gel-iron mixture is energized by a 100Hz low voltage source and adjacent resistivity receivers are monitored to detect changes in induced voltages by the propagation of the carrier fluid. From these induced voltages and utilizing an incremental inverse integral method, the inclusion geometry is displayed in real time during the installation process.

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