Research On Fire Safety Design Of Sub-safety Zone Of Underground Space Based On Emergency Evacuation

With the large-scale construction of underground space,various types of underground space accidents and disasters have grown synchronously with the scale of their development.Once underground space suffers from disasters or accidents,how to evacuate people safely and effectively has become to minimize the impact of disasters and reduce casualties The key.The evacuation design of underground buildings and above-ground buildings is quite different.Conventional evacuation methods of above-ground buildings are not operable in underground spaces.Some engineering practice cases of underground spaces of different depth levels adopt the concept of stage evacuation and use sub-safe areas Establish a temporary evacuation system to solve evacuation problems.As an important space node of the temporary evacuation path,the sub-security zone needs to ensure its smoothness,continuity,integrity and safety.The existing research on the fire safety design of sub-safety zones in underground spaces mainly relies on specific project practices to conduct point studies,the relationship between sub-safety zones and evacuation systems in underground spaces,strategies for evacuation organizations in underground spaces based on sub-safety zones,and ensuring sub-safety zones Issues such as fire safety design strategies for evacuation safety have not been systematically developed.With the large-scale,comprehensive and deep development of urban underground space,the research on the above issues will provide a certain reference for the evacuation design of underground space in the early stage of the design to ensure the safety of life and property of evacuees in underground space.First of all,the article sorts out and defines the relevant research background,research purpose,research significance,research status,research content,research boundary,etc.;it explains the definition,related concepts and types of sub-safety zones in underground space.Secondly,the basic research on the fire safety design of the sub-security zone of underground space based on emergency evacuation was analyzed.At the theoretical level,the relationship between building safety design theory,safety science and other related theories and this research is combed;the objective and subjective influencing factors of emergency evacuation of underground space are analyzed,and the six essential characteristics of sub-safety areas are combined With the establishment conditions,the design elements of fire safety in the sub-safe area of underground space based on emergency evacuation are proposed.Then,based on the development status and trends of layered development and deepening of underground space,the main functions and spatial forms of underground spaces of different depth levels are analyzed,and on the basis of this,the difficulty of evacuation of underground spaces of different depth levels is combined.The use of sub-safety zones in the underground space is preliminary analyzed.Furthermore,the analysis of the use cases of sub-safe areas in underground spaces of different depth levels mainly includes the basis of case selection,the evacuation design difficulties of cases,the evacuation organization model based on sub-safe areas,and the fire safety design strategies of sub-safe areas.As a practical basis for the fire safety design strategy of sub-safety zone in underground space.Finally,a comprehensive comparative analysis of the current norms in developed countries,academic research results at home and abroad,and specific strategies of related cases,the fire safety design strategies for sub-safe areas of underground spaces of different depth levels are proposed.Based on the practical cases of relevant projects,domestic and foreign norms and academic research results,this paper combines the development status and trends of stratified development and deepening of underground space,from the perspective of emergency evacuation,fire prevention of sub-safety zones of underground space of different depth levels.The safety design has been studied,and its research results have certain significance for ensuring the safety of life and property of evacuees in underground space,promoting the construction of underground space,and promoting the construction of related laws and regulations.