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利用数字图像处理技术表征岩石的非均匀性,并映射到有限元网格中,建立了能比较准确地反映岩石细观结构的数值模型。通过对花岗岩数字图像的处理,利用该模型进行花岗岩单轴压缩数值试验,研究花岗岩细观结构对其变形和强度的影响。研究表明,花岗岩细观结构对应力集中影响显著,在不同方向对花岗岩进行加载时,其抗压强度差异较大,表现出较强的各向异性行为,但对花岗岩弹性模量的影响很小。基于数字图像的数值分析方法为研究岩石细观力学性质提供了一种新的方法。
The heterogeneity of rock is characterized by digital image processing technology and mapped into the finite element grid. A numerical model that can accurately reflect the mesostructure of rock is established. Through the digital image processing of granite, numerical simulation of granite uniaxial compression is carried out by using this model to study the effect of granite mesostructure on its deformation and strength. The results show that the mesostructures of granite have significant influence on the stress concentration. When granites are loaded in different directions, the compressive strength of granite is quite different, showing strong anisotropic behavior, but little effect on the elastic modulus of granite . The numerical analysis method based on digital image provides a new method for studying the meso-mechanical properties of rocks.