Abstract:

Along with the development of mining works, transportation works and hydropower works, many tunnels are built in high groundstress area. Especially where the tunnel passes through squeezing and fractured ground, instabilities of the tunnel and the working face are subject to occur, which will result in serious impact on the construction safety and construction progress. In the article foreign judging methods on squeezing and fractured ground in high groundstress area are described, and preliminary discussions are made on the design and construction method and ground preconsolidation technologies of tunnels located in squeezing and fractured ground in high groundstress area.

Key words: high ground-stress, squeezing and fractured ground, deformation of tunnel, excavation and reinforcement