Research on evacuation simulation of underground commercial street based on reciprocal velocity obstacle model

The current study evaluates the influence of different exit quantity and location on evacuation efficiency of underground commercial street, and analyzes the difference of evacuation efficiency. The author selected the same underground commercial street design, with different locations layout of various exports. The improved RVO is used to generate the regional evacuation path tree according to the evacuation hierarchy of underground commercial street. A node monitoring mechanism is introduced to calculate and store the evacuation path of personnel nodes to prevent "penetration" and simulation stagnation. This paper analyzes the influence of the number and location of evacuation exits on evacuation efficiency by comparing the evacuation time of personnel, and puts forward relevant design principles. The experimental results show that under the same condition of layout and the total width of the outlet, simply increasing the number of outlets cannot effectively improve the fire evacuation efficiency of the underground commercial street. With the same number of exits, symmetrical distribution of both sides with the exit location is more conducive in improving the evacuation efficiency. This paper is expected to provide suggestions for the design of the number and location of the underground commercial street exit.