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一、概述在我国铁路隧道工程中,各类地层是按普氏的岩石坚固性系数f_(kp)进行分类的。作用在隧道支撑及衬砌上的地层压力的計算、衬砌类型、施工方法、施工机具及施工組織的选择,隧道的預算等都是根据f_(kp)值来确定,因此如何能正确地定出地层的f_(kp)值,是隧道設計和施工中的一个重要課題。普氏从1926年系統而完整地提出了岩石按其坚固性进行分类的概念以后用来表示坚固性的系数f_(kp),值主要是根据他所建議的按岩石試件的单向极限抗压强度R_(cж)来确定,即
I. Overview In our country’s railway tunneling project, all types of strata are classified according to Platts’ rock solidity coefficient f_(kp). The calculation of the formation pressure acting on the tunnel support and lining, the type of lining, the construction method, the choice of construction equipment and construction organization, the budget of the tunnel, etc. are all determined by the value of f_(kp), so how to correctly define the stratum The f_(kp) value is an important issue in tunnel design and construction. In 1926, Platts systematically and completely proposed the concept of classifying rocks according to their firmness and then used them to express the coefficient of firmness f_(kp). The value is mainly based on his proposed one-way limit compressive force of rock specimens. Strength R_(cж) to determine, ie