# Risk Assessment Method and Application for Tunnel Lining Demolition Construction
## 5 Conclusions  
This article takes the risk assessment of local demolition construction of tunnel lining as the research object and explores the safety risk assessment and its application to local demolition construction of tunnel lining. We mainly studied the risk influencing factors, risk assessment index system, risk assessment model, and evaluation criteria for local demolition construction of tunnel lining. Finally, we applied the research results to a certain tunnel in Qinghai for risk assessment of local demolition construction of tunnel lining. The main achievements are as follows:(1) The dismantling and replacement of tunnel lining is one of the important measures to solve the hazards existing in tunnel construction. Currently, there is no clear and systematic mechanism research, and most of them rely on empirical design and construction. During the local demolition construction process of a tunnel lining, it is difficult and risky. Due to the complexity and uncertainty of tunnel lining demolition construction, the geological conditions of tunnel lining demolition construction are complex, the engineering strength is high, the construction organization is difficult, and there are many construction risks. Ensuring construction safety is the key and difficult point.  
(2) A risk assessment model for tunnel lining demolition construction is established based on fuzzy hierarchical comprehensive evaluation and expert survey. The fuzzy hierarchical comprehensive evaluation method is used to evaluate the probability level of tunnel lining demolition construction risk, and an expert questionnaire survey is used to evaluate the risk loss level of tunnel lining demolition construction.  
(3) Applying research results to carry out risk assessment of lining demolition construction in a certain tunnel in Qinghai, it was found that the overall risk level of lining demolition construction in a certain tunnel in Qinghai belongs to \"V3\". The evaluation results are consistent with the risk assessment results of tunnel lining demolition carried out by experts organized by the design unit and construction unit. No construction accidents occurred during the tunnel construction process, verifying the rationality of the evaluation method. At the same time, it provides a reference for the application of risk assessment and control technology in tunnel lining demolition construction in practical engineering.  
(4) The risk assessment model for tunnel lining demolition construction facilitates risk mitigation, decision optimization, resource allocation efficiency, and enhanced safety. Through quantitative analysis and comprehensive evaluation, this assessment tool provides reliable data support to ensure the smooth implementation and successful completion of tunnel lining demolition projects.  
Conceptualization, L.L. and J.Z.; methodology, L.L.; software, X.F.; validation, L.L., J.Z. and X.F.; formal analysis, X.F.; investigation, X.F.; data curation, J.Z.; writing--original draft preparation, J.Z.; writing--review and editing, X.F.; visualization, L.L.; supervision, L.L.; project administration, L.L.; funding acquisition, L.L. All authors have read and agreed to the published version of the manuscript.  
This research was funded by Fundamental Research Funds for the Central Public Interest Scientific Institutes, grant number 2021-9046.  
Data Availability Statement: Data sharing is not applicable.  
The authors acknowledge the financial support provided by the Fundamental Research Funds for the Central Public Interest Scientific Institutes (Grant No. 2021-9046).  
The authors declare no conflict of interest.