一建国以来,我国一直沿用苏联的普氏分级和苏氏分级。普氏(普罗多古雅柯诺夫)早在1926年提出了用岩石抗压强度、手工凿1立方厘米岩石所消耗的功,手工打眼每班的生产率等七项指标的,平均值来表征岩石坚固性。然而,由于采矿技术的发展,其中几项指标已失去实际意义,只留下一个最简单的指标,即普氏系数f=R/100(R— Since the founding of our nation, our country has always followed the Platonic classification and the Soviet classification of the Soviet Union. As early as 1926, Platts proposed the average of seven indicators such as the rock compressive strength, the work consumed by one cubic centimeter by manual chiseling, and the productivity by manual drilling, Rugged. However, due to the development of mining technology, several of these indicators have become meaningless, leaving only one of the simplest indicators, that is, the Platts coefficient f = R / 100 (R-