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中文摘要：
基于胶结铝棒接触力学特性的系列室内微观试验,提出用于模拟岩石的微观胶结接触模型,并将该模型引入二维离散元商业软件PFC2D,模拟岩石室内单双轴压缩、直接拉伸和巴西试验,并将数值试验结果与室内试验实测结果进行对比分析,验证该数值方法在反映岩石基本力学特性方面的有效性,研究结果表明,基于水泥微观胶结模型的离散单元法能够合理地描述岩石的主要力学特性;通过胶结破坏数目与轴向应力之间的关系曲线可以识别岩石裂纹扩展的规律及各个阶段,并能够确定裂纹扩展过程中的起裂应力、裂纹损伤应力和峰值应力。
英文摘要：
Based on a series of microscopic mechanical tests on the bonded granules idealized by two glued aluminum rods,a microscopic bond contact model for rocks was proposed and implemented into a commercial distinct element code.The customized code was then used to simulate the uniaxial and biaxial compression tests,the direct tension test and the Brazilian test on rock.The numerical results were compared with available experimental data to verify the bond contact model.The results demonstrate that the distinct element method incorporated with the proposed model can capture the fundamental mechanical behaviors of rocks.The relationship curve between the bond broken number of bonds and the axial stress can be used to distinguish different stages of crack propagation and to predict the crack initiation stress,the crack damage stress and the peak stress.
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