Abstract: It is urgent to improve the level of tunnel waterproof and drainage technology and realize the quantitative design of spraytype waterproof. As a result, taking Donghuayuan Tunnel of BeijingZhangjiekou Highspeed Railway as an example, the influencing factors such as the thickness of spraytype waterproof coating, including the engineering waterproof grade, design service life, groundwater condition, tunnel longitudinal slope direction, tunnel environment, spraying construction method, etc., are analyzed. The quantitative design method of waterproof is proposed, which is based on the basic value and recommended value of spray layer thickness at different parts of the tunnel, and the thickness of waterproof layer is finally determined by weighted correction. A fullyclosed spraytype quick setting rubber asphalt waterproof system suitable for opencut tunnel is proposed, which has been successfully applied to the Donghuayuan Tunnel waterproof design. The tunnel automatic spraying waterproof equipment is developed, and the spraying waterproof construction automation is realized through the computercontrolled running device and spraying manipulator, which can replace the traditional manual spraying method. The practice shows that the mechanical spraying efficiency is 4 times of that of the manual spraying, and the qualified rate of waterproof inspection reaches 100%.

Key words: BeijingZhangjiakou Highspeed Railway, spraytype quick setting rubber asphalt, fullyenclosed waterproof, opencut tunnel, new waterproof material, waterproof design