Research On Risk Evaluation And Control Of Tunnel Construction Based On Entropy-Ahp And Unascertained Measure Method

As our country’s traffic engineering industry enters a period of rapid development,in order to reduce the traffic time and cost of crossing complex terrain,more and more tunnel projects are put into construction,so it is very important to ensure the safe construction of tunnel projects.On the one hand,tunnel construction risk depends on the complexity of objective factors such as geological conditions and design conditions,and on the other hand,it also depends on subjective factors such as the level of construction technology,the ability to detect hazards,and the ability to organize and coordinate on the construction site.Compare each other.Based on this,we need to carry out risk assessment research on tunnel construction,analyze the risk factors that affect the safety of tunnel construction,determine the construction risk level,and propose control measures for risk points,so as to ensure the safety of tunnel construction.The main research work in this paper is as follows:(1)Build a tunnel construction risk assessment index system.In this paper,after extensive statistical investigation of the accidents that have occurred in tunnels at home and abroad and analysis of relevant construction measures,the influencing factors of tunnel construction safety are analyzed in detail.The 6 main factors of team management level and monitoring and measurement organization ability are subdivided into 23 secondary influencing factors as evaluation indicators,which are used to evaluate the safety status of tunnel construction.(2)Introducing the unascertained measure theory,combining the analytic hierarchy process and the entropy weight method to determine the index weight,establishing a tunnel construction risk assessment model,quantifying the index,and quantitatively assessing the tunnel construction risk.The multi-index undetermined measurement vector is determined,and the risk level of tunnel construction is obtained in combination with the confidence criterion,and the risk is ranked according to the undetermined importance.(3)This set of risk assessment system is applied to the construction risk assessment of a highway tunnel in Shenzhen,and the project is divided into 13 sections for risk assessment work according to the different characteristics of geological and design conditions.According to the indicators with different weights of evaluation indicators and higher risk scores,the risk points in tunnel construction are analyzed,and improvement measures and construction suggestions are put forward in a targeted manner.On the basis of on-site rectification,the model is used to evaluate again until the risk is reached to an acceptable level.Engineering practice shows that this method achieves ideal risk control effect.