Research on the Site Selection of Sub-safety Zones in Deep Underground Spaces Based on Node Importance
To mitigate and address the safety risks associated with deep underground evacuations,the concept of sub-safety zone is introduced,establishing temporary shelters equipped with safety features and evacuation buffering func-tions in deep underground space.By abstracting the deep underground space model into a topological network and calculat-ing the importance of each network node and based on the characteristics of deep subsurface evacuations and the results of node importance ranking,the criteria for selecting and grading sub-safety zones are established.The findings indicate that the bottom of the primary vertical evacuation structure directly connected to the surface serves as an important evacua-tion node and should be designated as a primary sub-safety zone;nodes ranked in the top 7.0%in terms of importance are mostly located at the intersections of horizontal evacuation channels in the stairwell front room,designated as second-ary sub-safety zones;nodes ranked between 7.0%and 18.4%in importance are mostly located in the stairwell front room within the tunnel,designated as third-level sub-safety zones.The proposed location selection of deep sub-safety zones can effectively ensure the evacuation safety of crowds in deep underground spaces,providing theoretical foundation and technical support for establishing a safe evacuation system for underground spaces.
deep underground spacesub-safe zonenode importancetopological networksite selection
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