Study on the Connectivity Reliability of Underground Road System

The problems in connectivity of underground road system deepens the impact from disastrous emergencies. The more reliable connectivity calls for less time for emergency evacuation from underground road. Based on the summary analysis of urban underground road network, connectivity reliability is well defined and its calculation models are established in the article. Additionally, the evaluation is made of the reliability of different connectivity in different urban underground road system and the ways to improve are correspondingly recommended.