Abstract:

The author expounds the definition, engineering property, grade classification, type classification, postexcavation dynamics and assessment method of surrounding rocks; The author discusses the stability of the surrounding rock after tunnel excavation, believing that the curved tunnel face is more helpful to the stability of the tunnel face, however, so far it is difficult to form curved tunnel face by conventional machinery and equipment, and some tunnellers pay attention to the curved tunnel face and are making trials; The tunneling is developing in the trend of large crosssection excavation under the condition of actively reinforced surrounding rock; The author finally presents the classification of soft surrounding rock and special surrounding rock, to which attention should be paid during the design and construction of tunnels. The author believes that most surrounding rocks have selfsupport capability; poor surrounding rocks can be utilized in tunneling after reinforcement; the load of the surrounding rock is controllable; the dynamics of different surrounding rocks are different. In general, the tunneling technology develops based on the abovementioned purposes.

Key words: tunneling, mining method, surrounding rock, stability, dynamic classification, soft surrounding rock, special surrounding rock