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岩石内部裂隙缺陷对新裂纹的萌生扩展有显著影响,导致岩石强度大幅降低甚至破坏.研究内置缺陷岩石裂纹的萌生、演化与微破裂分布,有助于揭示岩体渐进破坏规律,具有重要的工程意义.采用细观损伤数值方法对单轴压缩下内置裂隙岩石的破坏进行研究,再现不同均质度岩石微破裂萌生、发育、扩展、贯通直至破坏以及整个过程的声发射分布.将数值试验同物理实验比较,结合前人研究进行分析.结果表明,内置三维裂隙岩石裂纹扩展和破坏过程与相应物理实验总体上一致;在较均质岩石中观察到反翼型裂纹,揭示出反翼型裂纹主动偏向翼型裂纹扩展的现象;鱼鳍状裂纹在椭圆裂隙扩展试验中极易出现,并在均质岩石中表现为翼型裂纹与反翼型裂纹以卷曲面形式扩展形成包裹状破裂面;岩石非均匀性对其应力场,强度,声发射和破坏形式有显著影响,均质性差的岩石易沿着内置斜裂隙发生单截面剪切破坏;细观损伤数值方法可以模拟岩石破裂全过程并揭示微破裂空间位移、聚集规律,研究结果可为研究岩石破坏机理的物理实验和理论分析提供借鉴.
The internal fissure defects in the rock have a significant impact on the initiation and propagation of new cracks, resulting in the rock strength is greatly reduced or even destroyed.Study on the initiation, evolution and micro-fracture distribution of the built-in fault rock cracks is helpful to reveal the progressive failure of the rock mass and has important engineering Significance The damage of built-in fractured rock under uniaxial compression is studied by the numerical method of meso-damage, and the acoustic emission distribution of microcrack with different homogeneity is reproduced, developed, expanded, penetrated and destroyed as well as the whole process. The results show that the crack growth and failure process of the built-in three-dimensional fractured rock is generally in accordance with the corresponding physical experiment. In the more homogeneous rock, the back-crack is observed and the back-crack is revealed The prolapse tendency of the airfoil crack propagates proactively; the fish fin crack appears easily in the elliptical crack propagation test, and the airfoil crack and the anti-airfoil crack propagate in the homogeneous rock to form the parcel-like rupture surface; Rock inhomogeneities have significant effects on the stress field, intensity, acoustic emission and failure modes, rock with poor homogeneity Single-sectional shear failure along the swash fracture built; injury meso numerical method can simulate the whole process of rock failure microfracture and reveals the spatial displacement, accumulation law, the results can be analyzed to provide a reference for the mechanism of rock destruction of experimental and theoretical physics.