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  A Preliminary Study on the Comprehensive Evaluation of the Disaster Prevention System of Large Urban Underground Space

  Urban underground space has been explored and used as basement, passageway, metro tun-nel and parking garage for a long time. The development of relatively shallow underground space is the primary stage, during which the mentioned underground structures are relatively small in scale, span length and depth. People usually go into these places only for passing by, they don’t like to stay in these kind of underground space. Nowadays, the advanced technology makes it possible to build underground structures with a larger size and more comfortable environment such as ventilation and lighting. Generally, large urban underground space should meet the index shown in table 1. They are now used as restaurant, theatre and shopping center. People can stay in these places for a period and really enjoy the time. Just as each coin has two side, disasters in these large underground space will then course even larger loss and danger in human lives. It is very important to evaluate the disaster prevention design of each large underground structure.

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