Abstract
Standard support patterns are not always selected according to in-situ rock condition estimated from tunnel face observation in hard rock tunnel. First, we define rock mass rating about tunnel face. The purpose of this paper is approach to make clear the relation among rock mass rating defined here, standard support patterns and some assisting methods about each tunnel face. Therefore, we show them graphically from a viewpoint of time series. As the result, it is realized that the distribution characteristic of rock mass rating is able to explain from a process of support pattern change and the number of assisting methods adopted.
