Abstract:Experience-based engineering analogy method is widely used in tunnel support design now. The reason lies in the uncertainty of engineering geology, and at the same time, the corresponding calculation of surrounding rock pressure is also difficult to be precise. Several existed calculation methods of surrounding rock pressure in tunnel are studied, and the model mechanism is analyzed so as to obtain the applicable conditions and limitations of the calculation formula. The calculation results of the calculation formula are compared and analyzed from the perspectives of cohesion and burial depth factors. The variation law of surrounding rock pressure calculation is obtained, and the segmented expression formula of surrounding rock pressure is proposed. The research results can provide reference for the design of tunnel support and the selection of safety control measures.
