Abstract:The Sichuan-Tibet railway faces the most complicated engineering geological conditions in the world. Affected by deep environment and engineering disturbance, the instability and catastrophe of rock masses surrounding deep-buried tunnels along the line became prominent; the analysis and research on surrounding rock catastrophe that accord with the deep characteristics are not only a major practical need for the safe construction of deep-buried and long tunnels along the Sichuan-Tibet Railway, but also the key to improving the development capabilities of deep engineering under special geological conditions. Therefore, taking “the analysis of deep surrounding rock catastrophe” as the research core, starting with the in-situ geological environment and engineering disturbance effect of deep surrounding rock catastrophe, this paper focuses on the study and thought on theory and method of deep surrounding rock quality classification, large deformation identification and rockburst disaster. Firstly, the in-situ geological environment characteristics of deep surrounding rock disaster in Sichuan-Tibet railway were summarized, and the engineering disturbance effect on deep surrounding rock disaster gestation was revealed from two aspects of experimental simulation and theoretical analysis; furthermore, based on the revised BQ method, a classification method of surrounding rock quality which can comprehensively reflect the influence of in-situ stress, geothermal and groundwater was developed, which was preliminarily applied to the classification of tunnel surrounding rock quality under the deep multi-field coupling environment on Sichuan-Tibet railway; finally, aiming at the two typical forms of surrounding rock disaster (e.g., large deformation and rockburst) of deep-buried tunnels along Sichuan-Tibet railway, the multi-factor stepwise evaluation method of large deformation classification of surrounding rock, as well as the research idea and prediction model and comprehensive prediction method of deep rockburst were proposed. The relevant research results and academic ideas can provide a reference for the disaster analysis and stability research of surrounding rock of deep tunnels along Sichuan-Tibet railway.