Structure Health And Safety Assesment Of Operational Tunnel

Urban subway tunnel is always built underground,tunnel structure will damage in the dual role of long-term natural environment and use conditions; what's more, its use function also gradually weakens; tunnel safety accidents occur due to structural reasons more and more frequently. Therefore, defining key factors that influence the health and safety of structure and evaluating operational health and safety of the tunnel structure comprehensively have important theoretical significance and engineering value. They can provide decision support for the safe operation and management of subway tunnel.Based on reading literature related to the health and safety of tunnel structure,combining with existing engineering practices,this paper identifys the major factors that affect the health and safety of tunnel operation. from external loads, the t unnel structure stress and deformation, material deterioration and leakage level and son on four areas. Then this paper builds operational tunnel structure health safety assessment system,and the various factors are classified and the key elements is digged out;at last, it establishs 19 evaluation indicators and defines their integration weights; at the same time, it makes use of optical fiber sensing technology to obtain monitoring datas of these 19 indicators,on the basis,it comprehensively evaluates operational health and safety situation of tunnel structure combining with Monte Carlo method. At the end of this paper,it takes four operational ubway tunnels in Wuhan for exempals, uses Monte Carlo method to assess the level of structure health and safety of these projects, and find key factors by sensitivity analysis. It also gives corresponding security maintenance measures for subway operation. The result shows it provides a new thinking way ofhe subway tunnel management.