|Alternative Title||Study on the Size Effect of Rock Material|
|Place of Conferral||兰州|
|Keyword||岩石力学 尺寸效应 耗散能 破坏形式 数值模拟|
Rock is a special dielectric material which macro continuous but microscopic discontinuous, which is filled with a large number of pores, joints and other defects, and is distributed in a random state. These special structures lead to obvious size effect of rocks. The results show that the deformation process and failure mode of rock samples of different sizes are obviously different,and the size has a significant effect on the compressive strength, elastic modulus and dissipation energy of rock.Therefore, size effect has always been one of the most important research topics in rock mechanics.In this paper, The granite was processed into cylindrical specimens with different aspect ratios for uniaxial compression experiments. The stress-strain curves were obtained in the whole process. Based on the test results, the effects of aspect ratio on rock strength, deformation characteristics and fracture form are analyzed. It is found that the theoretical results are in good agreement with the experimental results. On this basis, the strength and deformation of rock materials under uniaxial compression are studied. The physical mechanism of size effect is discussed and the influence mechanism of rock sample size on energy dissipation process during rock deformation and failure is discussed.
The process of crack generation, development and penetration of rock samples of different sizes during uniaxial compression is simulated by FLAC3D software. The variation of stress, strain and dissipation energy is analyzed, and the numerical simulation results and experimental results are presented. The results of theoretical calculation are in good agreement with each other, which proves the correctness of the theoretical model and the numerical results. Based on this, the law of energy evolution during uniaxial compression of rock samples with different sizes is analyzed. The results show that the total energy and dissipation energy absorbed by rock samples are positively correlated with axial strain, and The elastic strain energy increases first and then decreases with the development of axial strain.
|杨高升. 岩石材料尺寸效应的研究[D]. 兰州. 兰州大学,2018.|
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