Study On Health Assessment Of Shield Metro Tunnel During Operation Period Based On Internet Of Things

The interconnection of all things is the inevitable trend of the development all the time,it is also the inevitable result of the progress of science and technology,and the only way to the intelligent world.The emergence and development of Internet of things is a pioneering feat in the network world.With the advent of 5Gera,a more rapid,comprehensive and convenient social environment is bound to come.As the basis of all things,Internet of things will cover all areas of the human world.In the field of underground engineering,the health problem of subway and tunnel during operation has always been a widespread concern in the academic world.The damage phenomena such as water leakage,lining crack deformation,uneven settlement and so on are widespread,especially in the shield tunnel,with assembled structure form greatly reduces the integrity of the whole underground pipeline and can be potential risks.Based on the technology of Internet of things,this paper studies the health status of shield tunnel during operation,meanwhile the theory of tunnel health is raised,this paper also proves the feasibility and importance of the theory in tunnel health by using previous research and engineering practice.Based on the existing Internet of things health monitoring network,tunnel health theory is made by two parts:structural health and hidden health.Through the method of hierarchical clustering,the evaluation indexes of structural health are selected,at the same time the probability of hidden indexes is evaluated by Bayesian network so as to explain the importance of hidden indexes;the evaluation rules of structural indexes are formulated by referring to the existing rules;evaluation criteria of tunnel health are proposed by the way,with improved fuzzy evaluation method of AHP is used to evaluate the tunnel health to get an accurate result.In order to ensure the objectivity and accuracy of tunnel health evaluation,BP neural network is used to learn the evaluation process and results of tunnel health evaluation,and then to replace the weight and expert evaluation.The theory of tunnel health evaluation is based on a large number of measured data from the selection of health indicators to the detailed rules of the evaluation.With the further development and popularization of the Internet of things technology,the theory of tunnel health will be more abundant and the health problems of the tunnel will eventually be solved.