The ultimate displacement situation of tunnel and underground engineering surrounding rocks is analyzed,combining with Wushaoling tunnel under soft wall rock,the numerical simulation of the weak adjacent formation tunnel stability is analyzed by ANSYS,and explained simulates the tunnel limit displacement with the limit analytic method is one kind has the future computational method very much.

Conclusion shows that the rhelogical characteristics of soft rock is a marked factor to tunnel stability.

The basic characteristics of the expansive rock are expounded,as well as its effect on the tunnel stability.

The artificial neural network provides us a new theoretical method on the stability classification of roadway surrounding rock.

Mechanism and classification criterion for large deformation of squeezing ground tunnels;

Large section cavern excavation support and surrounding rock stability analysis;

Improved B-P calculation method and application in the classification of surrounding rock stability;

Assessment of surrounding rock stability based on set pair analysis;