抄録
Non-blasting tunnelling methods in hard rock have become increasingly important especially in urban areas in Japan.
In this study, information about 296 patents concerning the tunnelling technique during the last 16 years was reviewed and discussed. The information was classified into three categories, namely, preparatory demolition technique, secondary demolition technique and a combination of these two. They were discussed from the points of efficiency in actual recent tunnelling and in future development.
