Research On Key Technologies For Ventilation Of Urban Extra Long Tunnels

Since China’s reform and opening up to the outside world,many large and medium-sized cities have invested in the construction of tunnels within the city’s scope because of the rapid pace of urban construction.The tunnel is a relatively independent transportation mode.Compared with other modes of transportation,it has less impact on the surrounding traffic.At the same time,the tunnel is also not affected by bad weather.Due to these advantages of the tunnel,many cities have priority.Selection,especially when it is necessary to cross the big river.However,due to the large number of construction and use of urban tunnels,the problems associated with tunnel ventilation and smoke exhaust and tunnel fire safety have escalated,posing hidden dangers to the lives and property of the people.So far,China has not formulated an operating standard that can guide tunnel ventilation and smoke exhaust design and construction in all directions.The management department of the tunnel does not have a complete set of regulatory basis,leaving the design,construction,and management of tunnel ventilation and smoke exhaust.Blind area.Due to the large scale,constrained conditions,and high technical content of the city’s long tunnels,it is of great theoretical significance to study them.Based on the analysis of the research status at home and abroad,it is found that there are still some problems in the design of ventilation and smoke extraction for the city’s long tunnels.For example,there are shortcomings and shortages in the design concentration of CO and fumes in the domestic city’s long tunnels and the calculation method standards,and they are not fully utilized.The advantages of natural ventilation and exhaust fumes,and not considering the influence of ventilation and smoke exhaust design in the tunnel on the surrounding environment,and other issues.In order to solve these problems,the paper relies on the Wuhan East Lake Project as a support project to carry out research on the key technologies for ventilation and smoke extraction of the city’s long tunnels,formulate a design scheme for ventilation and smoke extraction suitable for this project,propose improvement measures,and guide the practice.Based on the field investigation and research of this project,based on the predicted recent and long-term traffic volume,this paper analyzes the influence of traffic volume,weather,and surrounding environment on the design of ventilation and smoke exhaust intunnels.The analysis and research on the design of ventilation and smoke exhaust for the long tunnels and the safety of evacuation of tunnel personnel were carried out.In response to the above-mentioned problems,related improvement measures were proposed,such as referring to the relevant regulations,combined with domestic vehicle conditions,road conditions,and traffic conditions,and Concentrations of smoke and design are required to be properly improved,and the advantages of natural ventilation vents and exhaust fumes are utilized in a special geographical environment,and air purification systems are used to purify pollutants.The emission of CO and smoke in the tunnel,the amount of CO and fumes needed to dilute the tunnel,the ventilation and smoke emission program were determined,the safety of the evacuation of the tunnel personnel was simulated,and the innovation proposed the rational use of natural ventilation to the special tunnel in the special traffic environment in China.The effective function of ventilation and smoke exhaust,and through the use of computer numerical simulation to develop the best solution for tunnel fire extinguishing systems and monitoring systems,and to analyze the safety of people evacuation.In this paper,according to the specific environment and conditions of the project in the scenic area,a ventilation and smoke exhaust design scheme suitable for China’s special traffic environment has been designed.It can provide reference for similar projects in the country,make full use of the advantages of natural ventilation ventilating and smoke exhaustion in special geographical environment,and effectively combine natural ventilation and other various methods of ventilation and smoke exhaustion in the later project research.The purification system purifies the pollutants to solve the problems of ventilation and smoke exhaust design and environmental impacts of the city’s long tunnels.