Abstract: The paper presents the research results based on failure mechanism and control countermeasures by numerical analysis and engineering tests. It shows that with the increase of buried depth, ground stress, and especially the influence of the horizontal tectonic stress, the surrounding rock of tunnels performs large asymmetric deformation under the original supporting conditions, and the key parts of failure are at the cross section of roadway layer and rock tendency layer; dislocation deformations such as shearing slip deformation between different layers and extrusion deformation of soft rocks by the influence of asymmetry structure of surrounding rocks will also occur. Combined with field engineering geological conditions, the asymmetric coupling support countermeasures by using bolt-mesh- anchor and anchor in corner to strengthen key parts supports are put forward, which shows good effect in field applications on asymmetric deformation and dislocation deformation controlling, and surrounding rock stabilities are improved.

Key words: deep layers tunnel, asymmetric deformation, numerical modeling, failure mechanism, control countermeasure