关角隧道为青藏铁路西（西宁）格（格尔木）二线控制工程。为了更好地解决关角隧道富水区防排水问题，以关角隧道水文地质为工程背景，采用有限元方法建立地下水注浆控制排放模型，对三叠系砂岩富水段进行模拟分析。分别分析了注浆止水圈渗透系数与厚度、节点流量的变化关系，得知富水区隧道注浆圈的控制参数具有其经济适用范围，并不是越大越好或越小越好；根据流量的变化过程验证了隧址区地下水位的变化情况；最后得出对于富水区隧道修建，取注浆圈厚度为3 m，渗透系数控制在2.1×10-3 m/d较为经济合理。研究成果对富水区隧道控制地下水排放、减轻对环境水资源的破坏具有一定的借鉴作用和指导意义。

Guanjiao tunnel is the key works of the Second XiningGeermu Railway. The control and discharging of the groundwater is modeled and the sandy waterrich ground section is simulated by means of finite element method, so as solve the waterproofing and drainage problem of the waterrich section of Guanjiao tunnel. The relationship among the permeability coefficient of the waterstop circle, the thickness and the node flow amount is analyzed. Conclusions drawn are as follows: the parameters of the grouting circle in the waterrich section should be controlled in a certain range; the situation of the groundwater is verified by the node flow variation process; in the construction of tunnel in waterrich section, the thickness of the grouting circle should be 3 m and the permeability coefficient should be 2.1×10-3 m/d. The paper can provide reference for the control and release of the groundwater in tunneling so as to minimize the impact on the water resource environment.