When tunnels are through waterbearing section of fractured rock mass

a complex interaction process between rock mass deformation and fluid transportation is one of the most important reasons for water gushing

water bursting and mud bursting.To study the rock mass deformation and fluid transportation in tunnel excavation under complex geological conditions

a hydraulic model of complex crack rock mass was established from the relationship between the crack growth degree of surrounding rock in deep buried tunnel and the engineering scale

with which fracture network of different levels in rock mass could be considered simultaneously.Furthermore

a computer Fortran program was put forward to simulate the solidfluid coupling of excavation process of a deep buried tunnel.And it was found that the principal fractures had strong flowing action and network fractures had storage function and lag effect in seepage area.And the yield area of surrounding rock was increased under the coupling of seepage field and stress field.