From Zichang To An'sai Research On Crack Formation Mechanism And Regulation Measures In Tunnel Lining Of Secondary Highway

China's tunnel development is closely linked with China's economic development.Especially after the reform and opening up,China's tunnel development tunnel has been greatly improved.In this process,it is inevitable that the early geological and hydrogeological surveys of the tunnel are not accurate enough,and the design and construction methods are not reasonable enough.It often causes lining cracking after some construction or during operation,icing,rock burst,large displacement collapse of rock and soil,freezing and thawing,ground subsidence,ground collapse,ground crack etc,lining structure deformation,cracking,wrong Table,leakage,corrosion and other diseases.Among them,cracks are a common disease,but different cracks have different effects on tunnels.How to distinguish this phenomenon requires specific analysis of tunnel cracks.There are many reasons for the cracks in the tunnel lining.Domestic and foreign scholars have also conducted different depth studies in different research methods.This paper will analyze the on-site observation and numerical simulation of tunnel lining cracks based on the hydrogeological conditions and topography of the Ya pinggou tunnel.Three kinds of treatment methods were adopted for the lining crack treatment of the Ya pinggou tunnel.The numerical analysis was carried out to analyze the cracks and structural stress of the lining structure strengthened by the tunnel lining cracks.The following rules can be obtained:This paper mainly studies the related causes of the tunnel lining cracks.Firstly,the force deformation and cracking characteristics of the tunnel lining structure are classified,and some characteristics of the tunnel lining cracks are obtained.Then the related causes of tunnel cracks are analyzed,mainly for lining.The structure itself,the lining structure stress and the reasons caused during the tunnel construction.By understanding the related causes of tunnel cracks,three measures for renovating the tunnel lining cracks are proposed: inlaid tunnel lining crack reinforcement,concrete arch reinforcement,embedded tunnel lining cracks and concrete arch reinforcement treatment,in principle,the third The tunnel is the safest and most durable way to renovate tunnel lining cracks.Through numerical analysis of three measures for treating tunnel cracks by numerical analysis software MIDAS/GTS NX,it is found that the effect of these three rectification tunnel lining cracks is getting better and better,and the settlement of tunnel lining cracks is gradually reduced after rectification,tunnel structure The force received is gradually reduced.Among them,the effect of using the embedded tunnel lining crack and concrete arch reinforcement is the most obvious.The final treatment of the lining trench lining crack treatment method is to use the embedded tunnel lining crack and concrete arch reinforcement.