The Reliability Analysis Based On Durability Performance Degradation About The Existing Tunnel Lining Structure

Entering the 21 st century,China's transportation and engineering construction builds a new chapter.Tunnel as an underground engineering building,has the incomparable advantage over some other engineering.the tunnel.The construction of the tunnel is booming and more and more tunnels are integrated into the transportation network,making great contributions to the transportation industry.However,the safety of the tunnel cannot be ignored and has attracted the attention of most countries at the same time.The aging problem of service tunnels has become increasingly serious,showing a very significant deterioration of durability and structural damage.Therefore,the durability and safety of the service tunnel structure have gradually attracted the attention of more scholars.The lack of structural durability will lead to deterioration of structural performance and decrease of structural reliability.It is necessary to use scientific and reliable research methods to evaluate the durability of the structure.Although many scholars have made a lot of valuable research,they mainly focus on thinking about ground architecture.As a special structural body,the force and surroundings of the tunnel is more complex and severe than the ground structure.Therefore,to study the reliability of the tunnel structure can not simply draw lessons from some of the research results of the ground structure.In this paper,some studies and explorations have been made on the reliability of the deterioration of durability of lining structures in service tunnels based on the reliability of engineering structures.First,we will sort out the current domestic and foreign research status,and summarize the problems and existing problems.Then sort out relevant knowledge and calculation methods of structural reliability.In addition,the lining structure's deteriorating effect is analyzed according to the special underground environment of the tunnel.Based on the above research work,considering the influence of various factors such as time,mechanics,etc.A prediction formula for the erosion depth model of erosion materials was established by combining experimental data with theoretical derivation.Finally,a degradation degree function is introduced.Based on the established degradation degree model and the limit state method,the durability degradation degree of the carbonization depth is used as an method to obtain a calculation method for the reliability of the lining structure in service.