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内尺度比是材料的最小结构和材料尺寸的比。在细观条件下,岩土材料可以看成是由不同尺度矿物颗粒组成的颗粒集聚体,含有不同尺度的天然缺陷。这些带有尺度特点的材料结构、构造特征无疑会影响岩土材料性质测试的结果和准确性,即岩土材料具有和金属材料一样的内尺度比。利用颗粒流软件fish语言编写程序虚拟实现了岩土材料单轴压缩试验,设计了0.05、0.10、0.20、0.40、0.60、0.80、1.00、1.20、1.40、1.60、1.80、2.00 mm等12种粒径数值试件,分别进行了单轴压缩试验。根据试件的破坏形态、应力-应变曲线,分析了内尺度比对测试结果的影响,发现:粒径小于0.40 mm之后,计算时间急剧增加,计算效率急剧减小;内尺度比小于0.01之后,材料的数值试验结果趋于稳定。这说明岩土材料也存在内尺度比,岩土体的物理力学参数的尺寸效应问题就是材料内尺度问题的一种表现形式。
The internal scale ratio is the ratio of the smallest structure of a material to the size of a material. Under meso-scale conditions, geomaterials can be regarded as agglomerates of particles of different scales and contain natural defects of different scales. These scale-structured material structures and structural features will undoubtedly affect the test results and accuracy of geomaterials, ie, geosynthetics have the same internal scale ratio as metallic materials. Using particle flow software fish language programming program to achieve a uniaxial compression test of geomaterials, 12 kinds of particle sizes of 0.05,0.10,0.20,0.40,0.60,0.80,1.00,1.20,1.40,1.60,1.80,2.00 mm were designed. Numerical specimens were uniaxial compression tests. According to the failure morphology and the stress-strain curve of the specimen, the effect of internal scale ratio on the test results is analyzed. It is found that when the particle size is less than 0.40 mm, the calculation time increases sharply and the calculation efficiency decreases sharply. When the internal scale ratio is less than 0.01, The numerical results of the material tend to be stable. This shows that there is also an internal scale ratio of geomaterials. The size effect of the physical and mechanical parameters of rock and soil mass is an expression of the internal scale problem in materials.