Brittle inequality of Hoek-Brown criterion and it?s applicability limit to GSI
ZHU Yong1，ZHOU Hui1，ZHANG Chuanqing1，LV Tao2
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy
of Sciences，Wuhan，Hubei 430071，China；2. China Nuclear Power Engineering Co.，Ltd.，Beijing 100840，China)
Abstract：In the 2018 version of Hoek-Brown criterion，it pointed out that H-B criterion is only applicable for brittle fracture of rocks rather than ductile failure，which constitutes a physical limitation not fully discussed yet on the value of geological strength index(GSI). A series of brittle inequalities of H-B criterion are then established based on the assumption of brittle fracture and the theory of brittle ductile transition. Constraints of stress-strength ratio on the GSI of different rock masses are given. The relationship between the GSI value and the buried depth is discussed. The H-B material will be invalid if the rock mass exceeds the ultimate depth to enter into the ductile failure range. The conclusions of the study are helpful for the rational use of H-B criterion to avoid unwanted deviations.
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2019, Vol. 38 
