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颗粒破碎是自然界中常见的物理现象。高应力水平作用下堆石坝料会发生严重的颗粒破碎。基于热力学和微极理论,建立了考虑颗粒破碎的微观力学模型。为了模拟颗粒体的破碎过程和侧向应力的影响,把胶结在一起的3个等粒径的颗粒体当作颗粒破碎体。通过引入颗粒破碎准则,并采用均匀化理论,建立了颗粒尺度的应力–应变关系,并模拟了加载过程中颗粒破碎发生时的应力和应变。计算结果表明所提出的微观力学模型可以模拟颗粒破碎前的应力逐渐增大和破碎时的应力跌落现象。
Particle crushing is a common physical phenomenon in nature. Under high stress level, rockfill dam material will have serious particle breakage. Based on thermodynamics and micropolar theory, a microcosmic mechanical model considering particle fragmentation was established. In order to simulate the impact of the crushing process and the lateral stress of the granule, the 3 granule with the same particle size cemented together are regarded as the crushed granule. By introducing the criterion of particle breakage and using the theory of homogenization, the stress-strain relationship of particle scale is established and the stress and strain of particle breakage are simulated. The calculation results show that the proposed micro-mechanical model can simulate the gradual increase of the stress before crushing and the stress drop during crushing.