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前言日本国营铁道公司的研究室在十五年前就开始进行在隧道掘进方面应用水射流的基础研究、切割岩石的试验和配有水射流的掘进机及配套的高压器件的研制。为了使水射流的压力与硬质岩石的破坏强度相
Foreword The research institute of the Japanese State Railway Corporation started the basic research on the application of water jets in tunnel excavation, the test of rock cutting, and the development of a roadheader equipped with water jets and associated high-voltage devices. In order to make the pressure of the water jet and the breaking strength of the hard rock