三维粒状脆性材料颗粒破碎的数值三轴试验

Numerical Triaxial Test for Particle Breakage of Three-Dimensional Granular Brittle Materials

针对脆性材料颗粒破碎的三维力学问题,从细观力学角度,以颗粒极限拉应力作为颗粒破碎的判别标准,进行了考虑颗粒破碎的堆石料大三轴排水剪试验的数值模拟,直观揭示了堆石料在三轴应力状态下的变形过程和细观机理。结果表明,基于颗粒流方法的数值模拟可再现堆石料室内试验的应力—应变及体变曲线、围压依赖性、剪胀性及结构变化等。

Aiming at three dimensional spatial mechanics problem of particle breakage for granular brittle materials, based on micromechanics, the ultimate tensile stress of grain is taken as fragmentation criterion. And then it simulates the large scale triaxial drained shear test of rockfill materials by considering grain breakage. The deformation process and micro mechanism of rockfill body is revealed under triaxial stress status. The results show that numerical simulation based grain flow method can reappear indoor test of rockfill materials on stress strain and volumetric strain axial strain curves, dependency of confining pressure, shear dilatancy and change of micro structure.