A two-dimensional grouting model considering hydromechanical coupling and fracturing in fractured rock is proposed and implemented in an GPU parallel multiphysics finite element-discrete element software named MultiFracs. The model can simulate the grout flows in existing and induced fractures in the rock media. The fracture network is represented by broken joint elements, which is updated to simulate fracture initiation and propagation during grouting. Therefore, both the hydromechanical coupling effect and rock fracturing are considered in the grouting model. A single-fracture grouting example is presented to verify the grouting model. Finally, the model is used to simulate the grouting process in a rock mass with a complex fracture network. The effects of grout yield stress, amount of injection holes, injection pressure, aperture, and especially hydromechanical coupling on grout penetration are studied. The results show that the grouting model can simulate the interaction between grouting-induced fractures and pre-existed fractures.

提出了考虑裂缝岩石流体力学耦合和压裂的二维注浆模型，并在名为MultiFracs的GPU并行多物理场有限元-离散元软件中实现。该模型可以模拟岩石介质中现有裂缝和诱发裂缝中的浆液流动。裂缝网络由断裂的节点元素表示，该元素被更新以模拟灌浆过程中的裂缝萌生和扩展。因此，注浆模型同时考虑了流体力学耦合效应和岩石压裂。给出了一个单裂缝注浆实例来验证注浆模型。最后，该模型用于模拟具有复杂裂缝网络的岩体中的注浆过程。灌浆屈服应力、注入孔数量、注入压力、孔径、尤其是对灌浆渗透的流体力学耦合进行了研究。结果表明，注浆模型能够模拟注浆裂缝与预存裂缝之间的相互作用。