[III-278] On the problems of rock mass classification for rock tunnel using advancing boring
Keywords:mountain tunnel, advancing boring, rockmass classification
In the rock tunnel, there are many cases where we encounter ground conditions that are very different from the original assumption. As a result, the change of support systems and/or excavation method are required. We analyzed the advancing boring data obtained in the tunnel in Hokkaido and examined the current rock mass classification. As a result, it showed that there is a possibility that the degree of coincidence can be increased by selecting the evaluation item used in the current rock mass classification and reviewing the threshold value.
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