Test Fills for Rock-Fill Dams.

摘要

Data from 14 Corps of Engineers' (CE) rock test fill projects are summarized, and six of these projects are analyzed in detail. Variables most often investigated in these test fills were (1) lift thickness, (2) roller type, (3) number of roller passes, and (4) rock gradation. Measured parameters were (1) compaction, (2) permeability, and (3) grain-size distribution, both before and after compaction. The vibratory roller generally gave the best compaction, but also caused a substantial amount of surficial breakage for most rock types. It was found in most cases that better results were obtained with a vibratory roller when compacting material with the fines (sizes less than plus or minus 3 in.) removed. The possibility of using the Los Angeles abrasion test to predict rock breakage was explored. However, no conclusions could be drawn due to the lack of data and to the diversity of testing methods used in the projects studied. Recommend procedures for (1) planning and design, (2) construction, (3) measurements and observations, and (4) evaluation of results of future test fills are given.