Abstract
To establish a more precise inspection method on backfill grouting thickness distribution especially at a sharp curve, the calculation method on tail void thickness distribution was developed, based on the examination on the characteristicsof in-situ measured data concerning with tail void. Furthermore, its performancewas validated by applying this method to the in-situ data. As a result, the followings were made clear: 1) even if copy cutter range is same, overcutting area and tail void thickness distribution depend on the cutter face rotation directionand its speed; 2) tail void distribution can be calculated by using deviation from cutter face center to segment center.
