1 前言 1994年10月28日,密云水库九松山隧洞进口岩塞爆破成功,作为第九水厂的首都工程,次年投入运行。第九水厂是北京市最主要的供水水厂,九松山隧洞已成为首都政治、经济、生活不可或缺的重要建筑之一。 九松山隧洞岩塞口成型准确,周壁光洁稳固,从岩塞 1 Introduction On October 28, 1994, the rock plug explosion at the entrance of the Miyun Reservoir in Miyun Reservoir was successful. As the capital project of No.9 Water Works, it was put into operation the following year. Ninth Water Works is the most important water supply plant in Beijing. The Jiu Song Shan Tunnel has become one of the most important buildings in the capital’s political, economic and livelihood. Nine Matsuyama tunnel rock plug mouth forming accurate, smooth and steady peripheral wall, from the rock plug