为提升盾构主驱动密封系统的密封性能和使用寿命，在分析盾构主驱动密封常见失效形式和失效原因的基础上，针对现有盾构密封系统的布局、结构设计和安装工艺的不足，总结提出密封安装结构设计优化和密封安装工艺优化的方案，以提升主驱动密封系统的密封性能，保障盾构施工安全稳定。以目前广泛应用的唇形密封为例，就工作压力对密封系统的影响规律进行建模分析。研究发现： 1）密封唇口的变形量主要受压力差影响； 2）密封隔环设置支撑对密封的承压能力、使用寿命和防止密封翻转有改善作用； 3）通过构建背压，形成合理的压差，能够提高密封系统整体的承压能力； 4）并联安装中间环的方法，可有效解决因外载压力过大导致密封翻转、进而密封系统整体失效的问题。

To improve the seal performance and service life of the main drive seal system of shields,   the common failure forms and reasons in main drive seal systems are investigated and the design optimization of a seal installation structure is performed. Further, the seal installation process based on the deficiencies of the layout, structural design, and installation process of existing seal systems is optimized to improve the seal performance of the main drive. The lip seal, which is widely used currently, is considered as a case study, and the influence of working pressure on the seal system is modeled and analyzed. It is found that (1) the deformation of the seal lip is mainly affected by the pressure difference on seal; (2) the support of the sealspace ring can improve the pressurebearing capacity and service life and prevent overturning of the seal; (3) the pressurebearing capacity of the entire seal system can be improved by generating back pressure and forming a reasonable pressure difference; and (4) the parallel installation of the intermediate ring can effectively prevent the overturning of the seal induced by excessive externalload pressure, thereby preventing the failure of the entire seal system.