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https://hdl.handle.net/11681/48252| Title: | Report of investigation of chemical grouts for rock bonding : Evaluation of the effectiveness of epoxy resin and polyester resin to strengthen fractured granite at NORAD C.O.C. |
| Authors: | Erickson, Herbert B. |
| Keywords: | Rock mechanics Grouting Epoxy resins Polyesters Gums and resins, Synthetic |
| Publisher: | United States. Army. Corps of Engineers. Omaha District. |
| Abstract: | The Northeast corner of the A-2 Intersection (Comer No. 3) at NORAD has been a problem to stabilize since the area was first excavated. Geologic defects were noted during the initial development and some movement occurred along major joints prior to June 1962. The opinion of consultants on proper treatments to improve rock stability was divided. Eventually a compromise design was developed which was based on partial removal of the rock and bolting or "pinning" of the remaining loose rock. This plan was adopted and during January 1963 while excavation was proceeding, excessive movements were noted on rebound gages, and it was clearly evident that the static stability of the intersection was being effected by the blasting and rock removal efforts. Further rock removal was suspended pending further evaluation of the plan. The investigation described herein was devised to study the effects of two chemical grouts on bonding the rock to produce stability. Laboratory tests were made first, to determine if appreciable bond could be developed to the moist rock, then test injections of epoxy resin (approximately 50 gallons, E-1) and polyester resin (approximately 200 gallons, P-1) were made, and the results of these injections were evaluated by drilling NX cores in the area and studying the cores and observing the core holes with a stratascope. This investigation is divided into two parts, and it will be covered by two separate reports. This is the first part and it will cover the laboratory testing, test injections, evaluation, and selection of epoxy resin grout for the final grouting to stabilize the rock in the entire comer. The second part of the report will cover the planned injection of approximately 2500 gallons of epoxy resin on a production basis to stabilize the entire northeast comer of the A-2 Intersection. It will include injection data, evaluation information obtained from core drilling, and movement data. |
| Description: | Technical Report |
| Rights: | Approved for Public Release; Distribution is Unlimited |
| URI: | https://hdl.handle.net/11681/48252 |
| Appears in Collections: | Technical Reports |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| Report of Investigation of Chemical Grouts for Rock Bonding_1963.pdf | 19.93 MB | Adobe PDF |  View/Open |