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采用连续介质快速拉格朗日分析程序(FLAC),模拟了颗粒体材料在压缩位移控制加载条件下的力学行为及破坏过程。颗粒及它们之间的界面被离散为尺寸相同的单元。颗粒被视为各向同性的弹性材料,而界面被视为弹性-应变软化-理想塑性材料。界面完全破坏之后,其内聚力为零而内摩擦角不为零,因而适于模拟颗粒之间的摩擦行为。在双轴压缩条件下的计算结果表明,压应力通过颗粒之间的接触,以应力线的方式在试样的垂直方向上传递,最终形成了清晰、有序的图案,而剪切应变增量的高值区主要位于一些界面上。从剪切应变增量的高值区中能发现试样中的最薄弱环节。此外,还研究了试样两侧的压应力、界面的初始内聚力及内摩擦角对试样的应力—时步曲线的影响。
The continuous medium fast Lagrangian analysis program (FLAC) was used to simulate the mechanical behavior and failure process of granular materials under compressive displacement control loading. The particles and the interface between them are separated into cells of the same size. Particles are considered as isotropic elastic materials, and the interface is considered elastic - strain softening - the ideal plastic material. After the interface is completely destroyed, its cohesion is zero and the internal friction angle is not zero, so it is suitable to simulate the friction behavior between particles. Computation results under biaxial compression show that the compressive stress is transmitted in the vertical direction of the sample through the contact between the particles and the stress line, finally forming a clear and ordered pattern, while the shear strain increment The high value area is mainly located on some of the interfaces. The weakest link in the specimen can be found in the high-value zone where shear strain is incremented. In addition, the influence of the compressive stress on both sides of the specimen, the initial cohesion of the interface and the internal friction angle on the stress-time curve of the specimen was also studied.