大断面导流洞进出口开挖支护设计与施工

Support Design and Excavation for the Inlet and Outlet Section of Large Cross-section Diversion Tunnel

随着水电开发建设的加速,在水电工程中出现的大断面导流洞越来越多。在这些大断面导流洞的施工过程中,特别是导流洞的进口渐变段和出口段,容易出现安全问题甚至塌方事故。对目前国内部分已完工或正在施工的大断面导流洞进出口的开挖支护设计与施工方案进行了总结,并以在不同地质条件下的典型案例加以说明,可供类似工程参考和借鉴。

With the rapid development of hydropower project, there are more and more large cross-section diversion tunnels in engineering practice. The construction of this diversion tunnel is prone to lead safety problems, and even the collapse accident, especially in the transition inlet section and outlet section. The experiences on the support design and construction program of inlet and outlet sections of large across-section diversion tunnels in some hydropower projects in operation or under construction in China are summarized herein, and explained by the engineering practices of typical projects under different geological conditions. These experiences can be as reference to similar projects.