Research of permeable lining structure for high pressure tunnel

Based on the surface force theory and body force theory of water load,formulas considering cracking property of concrete and excavation disturbed zone of surrounding rock are deduced according to axisymmetric computational models.Then corresponding computer program is compiled.Simulation of permeable lining is also carried out based on the universal finite element program.The results show that when body force theory is adopted,calculated reinforcement stresses and crack width are obviously smaller than surface force theory as the most part of water load is carried by surrounding rock,which fully embodies the design idea that surrounding rock is the key structure of tunnel in load carrying.When condition of partial surrounding rock is poor,raising the reinforcement in concrete lining alone can not effectively reduce the seepage quantity of tunnel.Partial excavation for replacement of surrounding rock would be a better way.