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一、地下工程岩体稳定分级 关于地下工程围岩分类方法及指标,迄今为止,大约有百余种之多,按照孙广忠的看法,可以分为如下几类:
I. Stability grade of rock mass in underground engineering About the method and index of rock classification for underground engineering, up to now, there are about more than 100 species. According to Sun Guangzhong’s opinion, it can be divided into the following categories: