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近年来频发的地质灾害使得深入研究大坝堆石体受力变形机制显得愈发迫切和重要。针对堆石颗粒具有形状极其不规则、咬合作用突出的特点,编写了一个简单易用的程序来随机生成形状不规则的数值颗粒。以正四面体为核,按照晶胞繁衍的方式,生成堆石的仿真颗粒集合体。模拟排水剪切条件下的大三轴试验,通过分析数值试验过程中细观参量的变化规律,探讨三轴剪切条件下堆石体变形的细观机制。分析表明,按照晶胞繁衍法生成的数值颗粒与圆颗粒相比能更好地模拟堆石,由颗粒簇形成的咬合力能形成更真实的力-变形关系;数值试验得到的应力-应变曲线和体变曲线与室内三轴试验结果基本一致;颗粒的破碎速率是联系堆石体宏、细观力学性质的重要纽带,通过分析堆石体颗粒破碎4个阶段细观参量的变化规律,深化了对堆石体变形机制的认识。
The frequent geological disasters in recent years make it more urgent and important to deeply study the mechanism of deformation and deformation of the rockfill dam. In view of the extremely irregular shape and prominent bite of rockfill particles, an easy-to-use program was written to randomly generate irregularly shaped numerical particles. With tetrahedrons as the nucleus, in accordance with the unit cell proliferation way to generate rock-filled simulation particle assembly. Under the condition of drained shear, a large-scale triaxial test is simulated. By analyzing the variation law of mesoscopic parameters during numerical test, the mesoscopic mechanism of deformation of rockfill body under triaxial shear is discussed. The analysis shows that the numerical particles generated by the unit cell propagation method can simulate the rockfill better than the circular particles, and the bite force formed by the particle clusters can form a more realistic force-deformation relationship. The numerical stress-strain curve And the body deformation curve is basically the same as the indoor triaxial test. The rate of particle crushing is an important link between macroscopic and meso-mechanical properties of rockfill. By analyzing the variation law of mesoscopic parameters in four stages of crushing of rockfill, Understanding of Deformation Mechanism of Rockfill.