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四、Hoek——Brown经验强度判据1980年,Hoek和Brown教授,根据他们自己多年的研究以及他们对岩石习性的理论和试验两方面经验,提出了适用于岩石和岩体的经验强度判据.(一)Hoek-Brown经验强度判据的主应力表达式以主应力形式表示的Hoek-Brown经验强度表达式为:σ_1=σ_3+√mσcσ_3+Sσc~2σ式中:σ_1、σ_3分别是破坏时的最大、最小主应力.σ_c是试件中完整岩块的单轴抗压强度.m和s取决于岩石性质以及受荷前岩体中节理裂隙的发育程度.
IV. Hoek-Brown Experience Strength Criterion In 1980, Professors Hoek and Brown proposed empirical strength criteria for rocks and rock masses based on their own years of research and their experience in both theoretical and experimental aspects of rock habits. (I) The principal stress expression of the Hoek-Brown empirical strength criterion The expression of the Hoek-Brown empirical strength in the form of principal stress is: σ_1=σ_3+√mσcσ_3+Sσc~2σ Where: σ_1, σ_3 are respectively destroyed The maximum and minimum principal stress .σ_c is the uniaxial compressive strength of the intact rock in the specimen. The m and s depend on the rock properties and the degree of development of joint fractures in the rock mass before loading.