The existing surrounding rock mass classification methods, such as the Q system,the RMR method, the HC method and the BQ method are only appropriate for the conditions of low or moderate field stress and low water pressure.
常用围岩分类方法只适用于中低地应力、低外水压力条件，在高地应力、高外水压力条件下的适用性差。
参考来源 - 复杂条件下围岩分类研究The tunnel surrounding rock mass classification is the basis of its design and construction.
隧道围岩分级是隧道设计、施工的依据。
参考来源 - 高速公路隧道施工阶段围岩动态分级系统研究·2,447,543篇论文数据，部分数据来源于NoteExpress
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