近年来,随着矿山、水利、水电、交通运输、城市地下工程和军事工程的发展,地下岩石掘进的规模日益扩大。据国外十八个国家的不完全统计,七十年代地下掘进的总长度为六十多万公里,总费用为五百多亿美元,比六十年代增加了一倍,予计八十年代地下掘进工程将有大幅度的增加。因此,地下掘进的施工技术越来越受到了各国的普遍 In recent years, with the development of mines, water conservancy, hydropower, transportation, urban underground engineering and military engineering, underground rock excavation has been expanding. According to the incomplete statistics of 18 foreign countries, the total length of underground excavations in the 1970s was over 600,000 kilometers and the total cost was over 50 billion U.S. dollars, double the figure of the 1960s. It is estimated that in the 1980s, Tunneling project will have a substantial increase. Therefore, underground excavation construction technology is more and more accepted by all countries