An Ant Colony Algorithm Based Research On Human Evacuation Of High-Speed Trian During Section Tunnel Fire

With the rapid development of China's high-speed railway,the importance of high-speed railway tunnel operation has become increasingly prominent.At present,most researchers at home and abroad is inclined to study the evacuation of personnel from the macro level,and for the fire products,for the evacuation of the impact of personnel to consider less,just consider the fire products for personnel damage,split the fire products will affect the evacuation.The choice of path will also cause the actual situation of casualties.In this paper,based on the working condition of the emergency stop in the middle of the train,the improved ant colony algorithm is used as the research tool,the basic environmental data of the smoke field and the temperature field are obtained by numerical simulation,the evacuation of smoke field,temperature field and personnel interaction was studied.Through the numerical simulation method,the distribution of the temperature field and the smoke field of the cars and tunnels under the condition of fire emergency stop in the middle of the train are studied,and the fire smoke field,temperature field and so on are evacuated in each ventilation condition.Just considering the temperature and the smoke,the results show that the optimal ventilation scheme of the main tunnel wind speed is 4m/s and the transverse channel wind speed is 2m/s.Based on the improved ant colony algorithm,the ant colony algorithm model of tunnel personnel evacuation is considered for the first time,such as the composition of the personnel and the key traffic capacity of the node,to consider the shortest evacuation time in the external environment and the crowding degree of smoke field and temperature field in order to optimize the target and take the capacity of the key node as the constraint condition,the procedure of evacuation optimization model considering the external environment and personnel relationship of smoke field and temperature field is prepared,which provides the basis for the subsequent ventilation control and personnel evacuation research.Based on the above basis,taking the common damage value of CO and temperature as the criterion,six kinds of ventilation schemes were calculated and six kinds of evacuation schemes were used to calculate the casualties of each scheme under 36 kinds of combination schemes,get reasonable ventilation and personnel evacuation plan.The results show that: transverse channel control wind speed should not be less than 1.5m / s,the main tunnel control wind speed should not be less than 3m/s,to ensure the safety of all train personnel evacuation;train under the wind,As far as possible from the nearest side of the train to avoid the evacuation,as far as possible to avoid downstream of the cross-channel evacuation;in the outlet of the staff,it is recommended along the tunnel axis direction away from the direction of fire evacuation,if the fire is small,Consider crossing the fire area.