EVOLUTION OF ROCK ANCHOR PRACTICE OVER THREE DECADES

摘要

In the absence of a formal national standard, the Recommendations of the Post Tensioning Institute (1996) have served the dam industry well regarding the design, construction, testing, and performance of rock anchors. These Recommendations are being updated again for re-issue in 2004, with special emphasis being devoted to the results of recent researches into issues related to epoxy protected strand. Recently, the author has been involved in the performance assessment of high capacity anchors installed in a dam in the Pacific Northwest in 1975. Very comprehensive contemporary records exist from the project, involving multiwire burton head tendons. These records clearly illustrate the "State of Practice" as it was for anchors at the time. This paper compares and contrasts these historical data with contemporary practices, illustrating the evolution of certain aspects of dam anchor practice in the U.S. over three decades.