引红济石调水工程深埋输水隧洞外水压力计算探讨

外水压力是深埋隧洞衬砌设计中的重要荷载，且往往难以确定，结合引红济石调水工程隧洞排水系统的设计对常用外水压力计算方法进行了探讨，并提出了采用渗流理论简化计算外水压力的有效方法，得出合理的设置排水系统及进行围岩灌浆是减少衬砌外水压力和维持地下水系平衡的有效措施。

Study on the Exterior Water Pressure of Deep Embed Tunnel of the Water Transfer Work from the Hongyan River to the Shitou River

The exterior water pressure is a major load for the design of deep embed tunnel, and difficult to determine. In conjunct with water transfer work from the Hongyan River to the Shitou River, the calculation methods of exterior water pressure commonly used in design of tunnel drainage system were expounded, and the simplified calculation method based on filtration theory was put forward. The proposed method can achieve rational design of drainage system and curtain grouting to lower down the exterior water pressure, and is the effective measure for maintaining the groundwater balance.