Studies On The Security Risk Management And Its Application In Gas Tunnels

Along with the implementation of the development of the west regions, many gas tunnel is being and to be constructed. In order to ensure the safety of these gas tunnels’ construction, there is a necessity to study on the security risk management and its application in gas tunnels.Closely related to the construction of Xiao Jialiang tunnel, this thesis summarizes the theory of the origin, storage, movement and outburst of gas in coal-bearing strata and non-coal strata, and their hazards to tunnel projects; studies the theory and method of security risk’s analysis, evaluation, control and monitoring in gas tunnels’construction; investigates the regional geological environment in the nearby area of Xiao Jialiang tunnel, in this environment, transported along the tectonic fissures into the tunnel, meeting the condition of formation of gas tunnel; makes a comparative analysis of the risk factors of gas tunnel in non-coal strata gas tunnels, makes and coal-bearing strata of in tunnels and risk management, and assesses the risk of Xiao Jialiang tunnel by adopting fuzzy comprehensive evaluation method; through the fieldwork in Xiao Jialiang tunnel an integrated disaster prevention technology system, consists of gas monitoring, enhanced ventilation, gas isolation, the transformation of mechanical equipment, etc, is introduced.The main innovations points of this thesis are:1. This thesis summarizes the studies on the definition of non-coal strata gas tunnel; demonstrates that gas explosion, combustion, and outburst exist in both coal-bearing strata gas tunnel and non-coal strata gas tunnel; suggests that during the construction of a project, a concept of enhancing the security risk management in order to control the gas hazards must be built.2. By referring to the risk management theory, based on the field investigation, theoretical analysis and fuzzy mathematics judgment method, this thesis analyses and assesses the security risk of gas tunnel during the construction, and successfully applies it in the construction of Xiao Jialiang tunnel.3. Through the practice of the constriction of Xiao Jialiang tunnel, this thesis summarizes an integrated disaster prevention technology system, which has important reference value for future gas tunnel construction.