Research On Reliability Of Personnel Safe Evacuation Under High-speed Railway Super-long Tunnel In Fire

Tunnel structure parameters,fire's three-dimensional development characteristics and personnel temporal and spatial changes influence the evacuation safety straightly.These three factors make the evacuation safety become uncertain most time.To determine a personnel evacuation is safe or not,a judgment criteria is needed.Presently,comparison of available evacuation time and required evacuation time acts as that criteria well.However,few studies of reliably methods to obtain the available evacuation time and required evacuation time have been done.In view of that,the calculation method of available and required evacuation time of personnel evacuation in fire situation for high-speed railway tunne had been studied in this dissertation,which is of great theoretical and practical significance.The research methods of the dissertation include model test,field test,theoretical derivation,theoretical programming,numerical simulation and data research are all used,studies of calculation method for safe evacuation reliability of special long high-speed railway tunnel,calculation model for available evacuation time and required evacuation time,design method for safe personnel evacuation and its engineering applications have all been carried out.The main conclusions are as follows:Clear judgment criteria of personnel evacuation safety has been obtained,personnel safety evacuation reliability index and failure probability calculation method are introduced Based on orthogonal test design method,method and principle of stochastic model for available safety egress time for high-speed railway tunnels are established.Based on evacuation characteristics of high-speed railway tunnels and the composition of required safety egress time,the method of calculating the required safety egress time has been put forward.The laws of fire smoke flow and temperature distribution in high-speed railway tunnel are revealed.Reliability of three-dimensional fire dynamic simulation technology calculation results has been verified.A flue gas control mode in high-speed railway tunnel emergency rescue station(tunnel emergency rescue station,tunnel emergency rescue station),emergency exit and shelter has been came up with.Combine the impact of design parameters including structural design parameters,flue gas control mode and the amount of flue gas emission in high-speed railway tunnel,a time random model of emergency rescue station has been established.The characteristics of personnel evacuation mode,evacuation speed and evacuation time under the high-speed railway tunnel emergency rescue station(tunnel emergency rescue station,tunnel emergency rescue station),emergency exits and shelters were revealed.Calculation parameters including evacuation speed,sex and age composition ratio are obtained.With a combination of evacuation time composition,personnel spatial distribution form and tunnel structure parameters in high-speed railway tunnel,a safety egress time random model suits for emergency rescue station and emergency exits has been established.Considering the effects of evacuation panic on evacuation speed in fire,the increase coefficient of single person evacuation speed in panic has been abtained.Finally,a panic coefficient range and standard of affect population evacuation efficiency in fire has been put forward.Based on personnel safety evacuation guidelines,a reliability analysis model of personnel evacuation in emergency rescue station,emergency exit,refuge was established With the first-order moment method and the Monte Carlo method,a personnel evacuation reliability index and failure probability in the emergency rescue station(smoke and non-exhaustive models)and the emergency exit(shelter)has been calulated.Based on personnel safety evacuation reliability,a design method of structure and flue gas control parameters in high-speed railway tunnel disaster prevention and rescue evacuation facilities was put forward.