为合理确定深埋水沟排水方式下隧道注浆圈特征参数，以某岩溶富水区隧道工程为依托，采用FLAC3D软件建立流固耦合计算模型，针对其注浆圈参数进行合理探讨，研究注浆圈厚度、注浆圈渗透性对隧道涌水量、衬砌水压力、结构安全性的影响规律。研究结果表明： 增加注浆圈厚度或降低注浆圈渗透性可降低衬砌水压、控制涌水量、保障结构安全，但并不代表实际工程中注浆参数需要追求最值，而应兼顾安全性和经济性，选取相对合理的注浆参数；结合模拟计算结果与同类工程案例，建议依托工程注浆圈厚度以5～6 m、渗透性比值以注浆前的1/50（渗透系数为2×10-6 cm/s）为宜，并应结合实际进行技术经济对比，合理确定现场注浆参数。

In order to rationally determine the characteristic parameters of tunnel grouting circle under drainage mode of deep ditch, the rationality of the grouting circle parameters of a tunnel in waterrich karst area is discussed by a fluidsolid coupling calculation model based on software FLAC3D, and the influencing laws of thickness and permeability of grouting circle on water gushing volume, water pressure of lining structure and structural safety are studied. The study results show that: (1) The water pressure of lining and the water gushing volume can be reduced, and the structural safety can be guaranteed by rationally increasing the thickness of the grouting circle or reducing the permeability of the grouting circle. (2) According to the simulation results and similar projects, the thickness of grouting circle of 56 m and the permeability coefficient of 2×10-6 cm/s are recommended, respectively; and the grouting parameters should be rationally determined according to actual technoeconomic comparison results.