A systematic approach for generating a stochastic void geometry with controllable shape features is proposed for more realistic numerical modelling of porous rock materials. The numerical model (a finite-discrete model) is established by integrating zero-thickness cohesive elements with finite solid elements, to trace the progressive fracturing and failure behaviours of porous rocks. A series of Brazil split tests are conducted on the synthetic specimens that are generated using 3D printing technique, to validate the proposed numerical model. By comparing fracturing patterns and load-displacement curves, it is demonstrated that the proposed hybrid numerical method has promising performances to capture the mechanical responses of porous rocks. In addition, the influences of void aspect ratio and orientation on the mechanical and fracturing responses of porous rocks are discussed. By counting the total damage proportion ($P_t$) and shearing damage ratio ($P_s$) of cohesive elements, the hybrid method offered a micro insight to reveal the mechanism of strength variation induced by different characteristics of void morphology. Modelling results demonstrate that better mechanical properties of porous rocks correspond to higher values of both $P_t$ and $P_s$. Comparison between modelling results and data from literature also validates the efficiency and accuracy of the proposed hybrid approach.

提出了一种用于生成具有可控形状特征的随机空隙几何形状的系统方法，用于更真实地对多孔岩石材料进行数值建模。通过将零厚度粘性单元与有限实体单元相结合，建立数值模型（有限离散模型），以跟踪多孔岩石的渐进式压裂和破坏行为。对使用 3D 打印技术生成的合成标本进行了一系列巴西分裂测试，以验证所提出的数值模型。通过比较压裂模式和荷载-位移曲线，证明了所提出的混合数值方法在捕捉多孔岩石的力学响应方面具有良好的表现。此外，还讨论了孔隙纵横比和方位对多孔岩石力学和压裂响应的影响。通过计算总伤害比例（${磷}_{吨}$) 和剪切损伤率 (${磷}_s$) 的粘性元素，混合方法提供了一个微观的洞察力来揭示由不同的空隙形态特征引起的强度变化的机制。建模结果表明，较好的多孔岩石力学性能对应于较高的两者值${磷}_{吨}$和${磷}_s$. 建模结果和文献数据之间的比较也验证了所提出的混合方法的效率和准确性。