Key techniques for the analysis and evaluation of high rock slopes

The problem of high steep rock slopes along the planned Sichuan-Tibet Railway is prominent and directly affects the construction and safe operation of the railway. Accurate numerical models and evaluation techniques for these high rock slopes are urgently being discussed and developed. The main key technical solutions involve numerical models for the potential sliding surface of rock slopes, simulation models for prestressed anchor cables, and stability analysis assessment methods of high rock slopes under natural conditions, earthquakes or blasting loads. Based on previous numerical analyses and slope engineering investigations, for high rock slopes, a friction-contact interface element model of the potential sliding surface is introduced, a new numerical model for the prestressed anchor cable is proposed, a method to calculate the slope safety factor via the finite element direct method is recommended, and some new ideas regarding the dynamic analysis of high rock slopes are shared. Finally, these key techniques are applied to the left bank slope of the Nu River Bridge of the Sichuan-Tibet Railway to comprehensively analyse and evaluate the slope stability. These key techniques may contribute to improving and facilitating the safe construction and safe operation of the Sichuan-Tibet Railway project.