Repair, Evaluation, Maintenance, and Rehabilitation Research Program. Applications and Testing of Resin Grouted Rockbolts.

摘要

A few instances of rockbolt failure have been reported where polyester resin had been used as the anchoring grout. All reported instances involved submerged installations. A TVA test report confirmed that in a short hole (15 in.), under submerged conditions, the water can interfere with resin polymerization. This document reports additional laboratory and field tests which showed that water interference is confined to a short zone at the resin-to-water interface. Tests employing a grout length of 2 ft or more, on No. 6 rockbolts held their yield load, wet or dry. Larger scale testing at the Bonneville Locks showed similar results. At grouting lengths of about 55 in. or more, yield load on a No.11 rockbolt was reached, wet or dry. This report finds no deficiency in polyester resin grouted rockbolts or anchors, so long as proper procedures governing installations are followed.