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The Characterization of Delamination Processes with Respect to Waterjet Shotcrete Removal during Tunnel Liner Repair and Maintenance
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2020-10-22
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[PDF-49.66 MB]
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Abstract:This research seeks to develop an advanced excavation system for the removal of damaged and compromised shotcrete structural liners used in underground workings and tunnels. Waterjet technology has the potential to circumvent many of the technical and operating challenges commonly associated with conventional shotcrete removal methods utilized in liner repair and maintenance. Empiric evidence suggests that waterjets are capable of selectively removing damaged areas of support liners without structurally compromising the material adjacent to the area being repaired. The primary objective of this research is to compare and contrast the unintended damage caused to the surrounding liner and substrate by both conventional impact hammers and waterjet excavation methods during empiric testing. This analysis utilized simulated shotcrete panels that were instrumented to quantify vibration during excavation, substrate damage, and delamination. Vibration data, ground penetrating radar, and visual inspection strongly supports the hypothesis that waterjet cutting generates less collateral damage to surrounding shotcrete and liner substrate, as well as detrimental impact to the steel reinforcement within the liner. The results of this research will be used as the fundamental basis for future work in this area.
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