Investigation on Control Mechanism of Balanced and Coordinated Deformation of Tunnel Surrounding Rock and Application in Engineering

The characteristics of underground engineering balance theory were further analyzed from the three aspects of the load-support balance of tunnel surrounding rock, coordinated control of surrounding rock support and deformation, and rock conservation of energy in order to solve the problem of tunnel rockburst and large deformation of soft rock under high stress. According to surrounding rock grades, the theoretical characteristic curves of tunnel support structure resistance and surrounding rock deformation based on the equilibrium and stability theory of underground engineering were described; and the corresponding construction suggestions were also proposed. The suggested coordinated control method for the surrounding rock balance and support structure deformation was developed by evaluating the variation law of effective load and energy conversion characteristics of the surrounding rock and support structure. A new tunnel surrounding rock support device characterized as "energy absorption and pressure release, support and resist compression" was designed by combining with the high strain energy absorbing material. Finally, the application in engineering showed that the application of the new technology used in rockburst and soft rock large deformation tunnels reduced the surrounding rock pressure by about 28.09% and ensured the safe and efficient construction of the tunnel.