STUDY ON STRENGTH CHARACTERISTICS OF SLATES BASED ON HOEK-BROWN CRITERION
LIU Yaqun1，LI Haibo1，LI Junru1，WANG Xuechao2，LIU Bo1，Xie Bing1，3
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. Yellow River Engineering Consultant Company，Ltd.，Zhengzhou，Henan 450003，China；3. Luoyang Institute of Science and Technology，Luoyang，Henan 471023，China)
Abstract：The Hoek-Brown empirical strength criterion is based upon the assumption that the rock mass is isotropic and has widely been used for design and safety assessment of underground and slope engineering. A common problem will be encounted in rock mechanics involving the determination of the strength of schistose or layered rock masses such as slates，shales or rock masses containing dominant discontinuities. Because the failure of these anisotropic rock masses is controlled by one or two discontinuities，the Hoek-Brown criterion can not be directly applied to analysis of such issues. So the criterion must be evolved for this purpose. On the basis of detailed study on Hoek-Brown criterion，the definition of intact rock pieces for layered rock mass is evolved and an important parameter in Hoek-Brown criterion，the uniaxial compressive strength of intact rock pieces¢ is proposed to be used for characterizing the variation of slates strength with schistosity orientation. A method of utilization of Hoek-Brown criterion to assess the strength of layered rock is then introduced. According to the proposed method，uniaxial and triaxial compression tests of slates in the West Route of South-to-North Water Transfer Project are conducted. Based on the experimental results，the related parameters and Hoek-Brown criterion for different layer directions of slates are determined. The variation of uniaxial compressive strength of slates with layer directions is also studied and the general Hoek-Brown criterion for the layered slates is then established. In addition，the triaxial compressive strength of slates under confining pressure of 10，15，20 and 25 MPa are predicted. The study results in this paper can provide references for similar projects.
刘亚群，李海波，李俊如，王学潮，刘博，谢冰，. 基于Hoek-Brown准则的板岩强度特征研究[J]. 岩石力学与工程学报, 2009, 28(S2): 3452-3457.
LIU Yaqun1，LI Haibo1，LI Junru1，WANG Xuechao2，LIU Bo1，Xie Bing1，3. STUDY ON STRENGTH CHARACTERISTICS OF SLATES BASED ON HOEK-BROWN CRITERION. , 2009, 28(S2): 3452-3457.
