Grouting is a commonly used technique in rock engineering to enhance the joint strength and improve the stability of surrounding rock. Grout penetration characteristic is controlled by grouting parameters and has a significant role on practice. In the study, a numerical manifold method (NMM) for grout penetration process simulation in fractured rock mass is firstly proposed. The fluid flow behaviour of the grout is assumed to be a Bingham fluid and control equations are established using discrete fracture network model. The global discretization equation, element sub-matrixes and NMM simulation algorithm for grouting are presented. Then, numerical tests for grouting process in a single fracture and a regular fracture network are conducted firstly to verify the proposed NMM grouting model by comparing with analytical solutions and experimental results. Furthermore, the effects of mesh size, fracture and slurry parameters on the grouting performance are systematically investigated using a random fracture network example. The numerical results indicate that the grouted zone and propagation depth decrease as the mesh size of numerical model and yield strength increases, while it increases as initial fracture aperture and grouting pressure increases.

灌浆是岩石工程中常用的一种技术，可以提高接缝强度并改善围岩的稳定性。灌浆渗透特性受灌浆参数控制，在实践中具有重要作用。在研究中，首先提出了一种数值流形方法（NMM）来模拟裂隙岩体中的灌浆渗透过程。假设灌浆的流体流动特性为宾汉流体，并使用离散裂缝网络模型建立控制方程。提出了整体离散方程，单元矩阵和NMM灌浆模拟算法。然后，首先，通过对单个裂缝和规则裂缝网络的注浆过程进行了数值测试，通过与解析解和实验结果进行比较，验证了所提出的NMM注浆模型。此外，使用随机裂缝网络实例系统地研究了网眼尺寸，裂缝和泥浆参数对灌浆性能的影响。数值结果表明，灌浆区和传播深度随数值模型的网格尺寸和屈服强度的增加而减小，而随初始裂缝孔径和灌浆压力的增加而增加。