Analysis On Damage Reason And Reinforcement Effect Of Highway Tunnel Structure

This paper relies on the Science and Technology foundation item "reserch to the repair and reinforcement of road tunnel structure" in Guizhou province,and it explains the present situation of theoretical study and practice about the repair and reinforcement of road tunnel structure in our country, the destruction features and classification of road tunnel structure, the cause of the damage to road tunnel structure(external force,material degradation,design defects and so on),the methords to repair and reinforce the road tunnel structure( grouting reinforcement, protective net, sprayed concrete, anchor reinforcement,water drainage,the replacement of lining and so on).This paper did finite element analysis useing the load-structure model.Based on the load-structure model calculation mode,tunnel lining has three structure models at present:insufficient of the lining thickness,vacancy between lining and surrounding rock,material degradation.This paper only analyze the material degradation model,to the deep tunnel’s secondary lining under the condition of Ⅳ,Ⅴtype rock,this paper analyzed the internal force in the five conditions:degradate the meterial properties by0%,20%,40%,60%,80%,figured out the internel force of road tunnel’s secondary lining and it also analyzed the safety ofsecondary lining.