...围岩分类；岩体力学参数估算；Hoek-Brown失效准则[gap=1333]Key words: RMi method; parameter optimization; rock classification; estimation of mechanical parameters of rock mass; Hoek-Brown failure criterion..
This paper systematically summarizes the results of researching the soft rockclassification, attribution and judgement of China′s coal mine drifts;
本文系统地总结了我国煤矿巷道在软岩分类、软岩属性及软岩判定等方面的研究成果；
2
In this paper, summarized the rockclassification methods at home and abroad, and analyzed various rockclassification factors of different methods.
本文总结分析了国内外的围岩分级方法，以及各种围岩分级方法所采取的影响因素。
3
Tunnel surrounding rockclassification history mainly on railways was introduced and analyzed; the surrounding rockclassification is the basic data for tunnel construction.