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以砂岩的室内试验数据为参照,使用颗粒流数值程序PFC3D,建立刚性颗粒组成的模型。通过设置颗粒接触模量、颗粒刚度比和接触粘结强度等细观力学参数,得到有合适宏观力学反应的模型。通过数值模拟获得砂岩微裂隙发展的过程,得到不同围压下砂岩的应力-应变曲线,反应出砂岩试样的弹性模量随围压增大而增大的性质。结果表明,PFC3D程序能够较好地模拟荷载作用下岩石的细观力学特性和宏观力学反应。
Taking the experimental data of sandstone as a reference, the particle flow numerical program PFC3D was used to establish the model of rigid particle composition. By setting the micromechanics parameters such as the contact modulus of the particles, the stiffness ratio of the particles and the contact bonding strength, the model with suitable macroscopic mechanical response is obtained. Through the numerical simulation, the process of the development of sandstone microcracks was obtained, and the stress-strain curve of sandstone under different confining pressures was obtained, which reflected that the elastic modulus of sandstone samples increased with the increase of confining pressure. The results show that the PFC3D program can well simulate the meso-mechanics and macroscopic mechanical responses of rocks under loading.