摘要
Hoek-Brown准则2018版指出,H-B准则仅适用于岩石脆性破裂,不适用于延性破坏,此论断对地质强度指数GSI的取值构成了物理上的限制,目前尚未得到充分讨论。针对该问题,从H-B准则的脆性破裂假设出发,基于岩石脆-延转换理论,通过推导和计算建立H-B准则的脆性不等式,给出应力强度比对GSI取值的限制条件,探讨不同岩性岩体的GSI取值与埋深的关系,指出不同类型岩体超过极限埋深后将进入延性破坏区,H-B准则也将随之失效。上述研究有助于H-B准则的合理使用,避免岩体参数估计出现较大的偏差。
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.
作者
朱勇
周辉
张传庆
吕涛
ZHU Yong;ZHOU Hui;ZHANG Chuanqing;LV Tao(State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan,Hubei 430071 China;China Nuclear Power Engineering Co.,Ltd.,Beijing 100840,China)
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2019年第S02期3412-3419,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51427803)
国家重点研发计划(2018YFC0809600)。
