Risk Analysis For Construction Of Highway Tunnel With Gas

In recent years,with the increase of investment in transportation infrastructure,highway and railway projects have been launched in succession or are in the stage of preparation.Tunnel is an important structure in the construction of highway engineering,also related to people’s livelihood and image of the region..It is unavoidable that more and more gas tunnels which across the seam are under construction.Gas tunnel accidents include gas asphyxiation,gas explosion,coal and gas outburst.Once the disaster occurs,it will bring great loss to people’s life and property,resulting in adverse social impact.Thus,it is especially important for improving the traffic safety situation to control the gas safety work in tunnel construction.This thesis relies on the project of tunnel of Tianchengba which lies on the Zhengan-Xishui highway in Guizhou Province of China,aimed at the risk analysis for the construction process of high gas tunnel project.The main research contents are as follows:1.This paper analyzes the situation of coal mine gas accidents in the past five years,putting forward the importance and necessity of the tunnel risk research and introducing the research status of gas tunnel risk analysis at home and abroad.2.This paper introduces the concept,origin and characteristics of gas,combined with the analysis of the accidents of gas accidents in coal mines in the past five years and the typical gas disasters at home and abroad.3.The risk is identified and the risk evaluation index system is established by using decision tree and expert analysis.4.Combined with the risk evaluation index system,the judgment matrix is determined by the form of issuing the questionnaire to the experts,and using the Yaahp software to establish the hierarchical model to obtain the weight of each index factor.5.The construction risk probability of tunnel of Tianchengba is finally obtained the weight of each index by AHP to calculate the proportion through the three stage evaluation,combined with fuzzy comprehensive evaluation method.The risk level of tunnel of Tianchengba high gas tunnel is determined according to the relevant regulations.6.Combined with the engineering examples,the paper puts forward the measures to deal with the risk,which is to control the risk and minimize the loss caused by the risk.The gas accidents occur in coal mine frequently,thus it becomes more and more improved for the technical regulations for the coal mine industry.Relevant information on the railway tunnel although is not more detailed than coal mine,but it has some regulations to follow,while the highway gas tunnel has no clear regulations,mostly references the relevant documents of railway.In this paper,according to the relevant provisions of the relevant technical guidelines issued by the Guizhou provincial highway tunnel,the fuzzy AHP comprehensive evaluation is analyzed,more in line with the actual situation of the project.