摘要
Abstract
The study area is located in the hilly area,vegetation development,mainly composed of three sections of the tunnel,1#tunnel length 2 068.0 m,2#tunnel length 290.0 m,3#tunnel length 541.0 m,between the tunnel through the surface conveyor belt connection.This project mainly adopts comprehensive survey methods such as engineering geological mapping,drilling and in-situ test,and finds out the engi-neering geological conditions,hydrogeological characteristics and geotechnical engineering characteristics of the site where the tunnel is loca-ted.The research shows that the surrounding rock of the entrance and exit sections of 1#tunnel and most of the tunnel sections is in an unstable state,and the unstable section accounts for 69.35%.The entrance and exit sections of 2#tunnel are in an unstable state,and the unstable sec-tion accounts for 35.19%.The surrounding rock grade of the tunnel body section is grade Ⅲ,which is in a relatively stable state.The en-trance and exit of 3#tunnel and the tunnel section are in an unstable state.The stability of surrounding rock in the entrance and exit sections of the three-section tunnel is poor.During the excavation of the cavern,the roof is prone to collapse and the side wall is prone to instability.Sup-port should be strengthened during excavation.关键词
隧道/工程地质条件/围岩等级Key words
Tunnel/Engineering geological conditions/Surrounding rock grade分类
交通工程
