Discussion on the inhomogeneity and size effect of engineering rock mass from the perspective of random joints distribution
In order to study the influence of the distribution of random joints on the inhomoge-neity and size effect of the engineering rock mass,156 multi-scale equivalent rock mass models containing different random joints were constructed using the equivalent rock mass technique.Through the uniaxial compression test,the crack propagation mechanism of different rock mass models was studied,and the mechanical parameters of each model variation with the se-lected position and longitudinal size were analyzed.The results show that the initiation cracking position of rock mass is mostly located at the intersection of joints.When obvious macroscopic cracks occur in rock mass,they usually penetrate along the joints.The distribution of random joints makes the engineering rock mass show a strong inhomogeneity and size effect.The smaller the joint density,the more obvious the inhomogeneity of rock mass.Relative uniform dimension(RUD)is proposed to characterize whether the rock mass is relatively uniform.In general,the RUD corresponding to the uniaxial compressive strength and elastic modulus parameters are the same.However,when the number of joints is small,the RUD corresponding to the elastic modulus is larger,and the existence of joints has a grea-ter impact on the deformation characteristics of rock mass.The RUD is significantly correlated with the representative elementary volume(REV).In most cases,RUD and REV have the same value,the RUD of the rock mass has the same engineering significance as the REV.
engineering rock massequivalent rock mass technologyjointsize effectinho-mogeneityRUD
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