针对裂隙岩体灌浆数值模拟多采用固定的地下岩体压力以及地下水压力，裂隙网络建模精度较低，裂隙灌浆模拟结果与实际工程具有较大差异，提出了考虑地下压力梯度的三维随机裂隙网络灌浆数值模拟方法，将通过拉丁超立方抽样方法生成的三维裂隙网络进行了优化，通过实时观察统计裂隙网络的浆液压力场变化以及浆液流量变化，实现灌浆过程的精细模拟。并以石岛湾核电站工程帷幕灌浆区域某灌浆孔为例进行分析，结果表明，相较于传统的采用固定的地下压力的岩体灌浆数值模拟，考虑地下压力梯度的模拟方法最终形成的防渗帷幕更加完整，且灌浆量、灌浆时间更加接近实际工程，灌浆模拟精度有了明显提升。研究结果可为多裂隙的灌浆模拟和实际工程的灌浆效果预测提供参考依据。

In view of the low accuracy of fracture network modeling in the numerical simulation of grouting in fractured rock mass, and the large difference between the simulation results of fracture grouting and the corresponding actual project, a numerical simulation method of three-dimensional(3D) random fracture network grouting considering underground pressure gradient was proposed. By optimizing the 3D fracture network generated by Latin hypercube sampling method, the modeling accuracy of underground 3D fractured rock mass and the grouting simulation calculation speed were improved. Through real-time observation and statistics of the changes of grout pressure field and grout flow in the fracture network, the fine simulation of the grouting process was achieved. Taking a grouting hole in the curtain grouting area of a hydropower project as an example, the simulated grouting volume and grouting time were compared with the actual grouting volume and grouting time. The results show that compared with the traditional numerical simulation of grouting in fractured rock mass with segmented fixed pressure, the simulation method considering the underground pressure gradient proposed is smoother in the pressure field during the slurry diffusion process, and the slurry diffusion distance is farther. The final grouting curtain is more complete, and the grouting volume is close to the real engineering grouting volume. The research results can provide reference basis for grouting simulation with multiple cracks and prediction of grouting effectiveness in practical engineering.