三维梁-颗粒模型与岩石材料细观力学行为模拟

3-D BEAM-PARTICLE MODEL FOR SIMULATING MESO-MECHANICALBEHAVIOR OFROCK MATERIAL

建立了三维梁－颗粒模型， 用以模拟岩石材料的细观力学行为。在此模型中， 岩石材料被随机地离散成一系列的颗粒单元， 相邻颗粒单元的形心由弹脆性的梁单元连接， 以考虑材料的连续性。材料的无序性通过改变颗粒单元的尺寸、位置或梁单元的力学性质来实现。算例表明， 该模型能够较为真实地模拟出岩石材料性质对荷载－位移曲线的影响， 以及裂纹扩展过程中所伴随的损伤局部化现象。

The three dim ensionalbeam -particle m odelis developed to sim ulate the m eso-m echanicalbehavior ofrock m aterial. In the m odel, the m aterialis represented as a system ofdiscrete and interacting disks w ith theircentreslinked through a setofbrittlebreaking beam s. The initialdisorderorheterogeneity ofthe m ate- rialis im plem ented by varying the disk sizes and beam properties. Num ericalsim ulations show thatthe new m odelcan realistically captures the spread ofcracking and its localization.