Computer-Assisted Grouting Evaluation Systems

by Leland F. Grant, Hensley-Schmidt Inc, Chattanooga, TN, USA,



Document Type: Proceeding Paper

Part of: Issues in Dam Grouting

Abstract:

Electronic monitoring of cement pressure grouting at Ridgway Dam provides a powerful tool for geologic assessment of drilling and grouting results. Graphic surveillance and analysis of the ongoing grouting operation allow immediate identification of the filling, tightening, and checking phases. The compiled results of sequentially scheduled primary, secondary, and tertiary holes show trends toward a point of diminishing returns. Grout takes for the primaries respond predominantly in the filling phase, with minor quantities of hole footage in the tightening or checking phase. Grout takes for the secondaries respond with reduced filling phase results and increased amounts of terminal tightening and checking phase characteristics. When the treatment has been monitored and controlled through primary and secondary grouting, the tertiaries show significant terminal responses. Any substantial divergence from this trend indicates a response to significant bedrock weathering or dissolution features.

Subject Headings: Grouting | Cement | Dam foundations | Weathering | Quality control | Graphic methods | Geology

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