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土地是不可再生的资源,随着土地资源日益匾乏和人们对环境的要求日益突出,人们越来越热衷于地下空间资源的开发利用。自1863年伦敦建成第一条地下铁道以来,世界许多国家都在开发利用地下空间的领域做出了成功的尝试。地下交通建设地下铁道是缓解城市交通拥堵,改善城市环境的有效措施。世界最庞大的地铁网在纽约。纽约现有地下铁道273.5英里,地铁站486个。地下交通具有高速、不受干扰的优越性。英法两国联合在英吉利海峡海底40—50米深处
Land is a non-renewable resource. With the increasing scarcity of land resources and people’s increasing demands on the environment, people are more and more interested in the development and utilization of underground space resources. Since the first underground railway was built in London in 1863, many countries in the world have made successful attempts to develop and use underground space. Underground Traffic Construction Underground railways are effective measures to ease urban traffic congestion and improve the urban environment. The world’s largest subway network is in New York. New York has 273.5 miles of underground railways and 486 subway stations. Underground traffic has the advantages of high speed and freedom from interference. British and French joint 40-50 meters deep at the bottom of the English Channel