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新中国成立后，地质部门和采掘工业，曾于50年代开始引用苏联M·M·普罗托吉雅柯诺夫按照岩石坚固性的分级表（简称普氏分级）。该分级原是以综合各种采掘作业（挖掘、凿岩、爆破、地压……）难易程度的坚固性系数f将岩石分为10级。1956年地质部又颁发试行了按照松散程度及凿岩性指标划分的岩石分级表（简称地质部分级），总共分为11级。普氏分级简明、概括，分级指标稳定，应用历史悠久。但试验所需设备比较庞大和昂贵，试样要求精加工，这些试验条件在施工现场是难以具备的。地质
After the founding of New China, the geological department and the extractive industry, in the 1950s, began to quote the Soviet Union M. Prokogyakoff in accordance with the rock solidity scale (Platinum grade). This classification is based on a solidity factor f that combines the degree of difficulty of various excavation operations (excavation, rock drilling, blasting, ground pressure, ...) to classify rock into 10 levels. In 1956, the Department of Geology also issued a trial of a rock classification table (abbreviated as Geological Partial Level) based on the degree of looseness and rock drilling performance, which was divided into 11 levels. The Platts classification is concise and general, the classification index is stable, and the application history is long. However, the equipment required for the test is large and expensive, and the sample requires finishing. These test conditions are difficult to obtain at the construction site. Geological