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最新研制了一种完全透明、较低温度下拉压比可达1/6.6的树脂,其与岩石特性的相似性较前人的研究有大幅度提高。制作了一组含三维内置平行双裂隙组的试件,详细描述并分析了单轴加载下试件的裂隙扩展与贯通过程,研究其产生的条件和机制。试验结果表明:试件的破坏大致经历4个阶段,三维裂隙组的断裂比二维情况复杂得多,产生了多种不同形态的裂纹。在FLAC3D软件框架内建立了一种新的弹脆性本构关系,并采用超细单元和合理形态的网格建模。将数值模拟结果与相关试验进行对比,相符程度良好,表明新数值模拟方法的有效性。当双轴加载时,模拟结果也与前人类似试验结果有很好一致性。
Newly developed a completely transparent, lower temperature and pressure ratio up to 1 / 6.6 resin, and its similarity to the rock properties than previous studies have greatly increased. A series of specimens with three-dimensional built-in parallel double fracture groups were fabricated. The crack propagation and penetration process of the specimens under uniaxial loading were described and analyzed in detail. The conditions and mechanism of the fracture propagation were studied. The experimental results show that the failure of the specimen goes through about four stages, and the fracture of the three-dimensional fracture group is much more complicated than the two-dimensional one, resulting in cracks of many different forms. A new elastic-brittle constitutive relation has been established in the FLAC3D software framework, and the use of ultra-fine elements and a reasonable shape of the grid modeling. The results of numerical simulation are compared with those of the related experiments. The results are in good agreement with each other, indicating the effectiveness of the new numerical simulation method. When biaxial loading, the simulation results are also in good agreement with the results of previous similar experiments.