Study on mechanical properties and meso-initiation mechanism#br#
of granite with non-persistent joints
LIU Tingting1，2，YANG Runchao1，DING Luyang1，LI Xinping1，2，ZENG Lele1，2
(1. School of Civil Engineering and Architecture，Wuhan University of Technology，Wuhan，Hubei 430070，China；
2. Sanya Science and Education Innovation Park，Wuhan University of Technology，Sanya，Hainan 572024，China)
Abstract：The complex fracture initiation mechanism and failure mode of discontinuous joints are significant to the mechanical behavior of rock mass. Considering the effect of the joint angles and length，the influence of non-persistent joint on the mechanical properties and fracture characteristics of rock mass are analyzed with granite rock specimens under uniaxial loading. Then a three-dimensional discrete element model was established，and the failure mechanism and crack propagation were investigated from the meso-scale. Finally，a fracture mechanical model with a non-persistent joint is established to analyze the fracture toughness，and the influence of joint inclination and penetration on the brittle fracture resistance of rock mass is quantified. The results show that：the degradation effect of initial damage on rock mass is obvious. Six kinds of cracks are distinguished according to the experimental results and the crack initiation failure mode of joint samples has a significant influence on the strength characteristics. The fracture toughness of the specimen increases with the increase of joint inclination at the range of 15°‐75°，and the brittle fracture resistance of the specimen with 15° joint is the weakest. With the increase of joint persistency，the fracture toughness of jointed rock mass decreases in an approximate hyperbolic trend.
刘婷婷1，2，阳润超1，丁鹿阳1，李新平1，2，曾乐乐1，2. 含非贯通节理花岗岩的力学特性与细观起裂机制研究[J]. 岩石力学与工程学报, 2023, 42(5): 1070-1082.
LIU Tingting1，2，YANG Runchao1，DING Luyang1，LI Xinping1，2，ZENG Lele1，2. Study on mechanical properties and meso-initiation mechanism#br#
of granite with non-persistent joints. , 2023, 42(5): 1070-1082.
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2023, Vol. 42 
