The lithology of the entrance segment is weathered metasandstone

existing shallow and unsymmetrical pressure

constructing with three-pilot drift method. The construction process of Fuxi shallow multi-arch tunnel under unsymmetrical pressure using special-purpose analysis program of fast Lagrangian analysis of continua in 3-dimension is analyzed. Comparing excavated shallow-buried tunnel with excavated deep-buried tunnel

the changes of tunnel deformation

and stresses and displacements of middle-wall and supporting structure in different construction stages are obtained. By comparison actual tunnel construction orders are optimized. Comparing to monitored and measured data in site

the analysis results provide a scientific basis and technical guidance for construction of Fuxi shallow multi-arch tunnel under unsymmetrical pressure.