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国内外研究岩石分级的方法虽不同，但大体可概括为两类，一是实测可钻性分级法，或模拟生产过程对岩石分级。这种方法较结合生产实际，但随生产条件技术条件变化而变化，有其时间上和条件上的局限性。另一种是从研究岩石的各种属性入手，按岩石的固有物理机械性质分级。它不随生产条件改变而改变。但岩石可钻性，是其各种属性在钻进过程中的综合反映，而任何一种测定方法，都无法囊括岩石所有的性质，只是选择一种或几种主要性质对岩石分级，这就是此种分级法的真实性和相对性。我们是通过测定岩石的动力硬度及抗压强度进行岩石分级的，沿用国内习惯，采用十二级分级法。
Although the methods of studying rock classification at home and abroad are different, they can be generalized into two types. One is the measured drillability classification method, or the simulation of the production process to classify the rock. This method compared with the actual production, but with the production conditions and technical conditions change, there are time and conditions of the limitations. The other is to study the various properties of rock to start, according to the inherent physical and mechanical properties of rock classification. It does not change with changing production conditions. However, the drillability of rock is a comprehensive reflection of its various attributes during drilling. However, any measurement method can not include all the properties of rock and only selects one or several major properties to classify the rock. That is, The authenticity and relativity of this classification. We determined the rock by dynamic hardness and compressive strength of rock grading, follow the domestic habits, the use of twelve grading.