Abstract: Abstract: In order to improve the understanding of the fire smoke spread law of multi-point entry and exit urban underground expressways, and enrich the domestic research on the escape and evacuation of urban underground expressways, this paper first determines the available evacuation time through the fire smoke simulation test, and then uses numerical simulation to establish the simulation model of the escape passage of Shanghai Beiheng passage. By combining different escape passage door widths and spacings, a total of 416 different schemes are designed to study the personnel evacuation effect of different escape passage design schemes. The results show that under the most unfavorable fire scenario of the multi-point access urban underground expressway, the evacuation efficiency of the escape passage is continuously improved with the decrease of the escape passage spacing and the increase of the door width, but when the door width increases to 1.4 m, the evacuation efficiency is basically no longer improved. In combination with the actual scene study, the design of escape passage spacing in the specification should be shortened, and the design of escape passage door width should be increased, and the recommended design scheme of escape passage in Luding Road hub section of Shanghai Beiheng Passage is given.

Key words: Key words: underground expressway, escape efficiency, door wide, spacing