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随着国家交通基础建设投资力度的加大和人们对环境保护的日益重视,隧道工程建设呈现较大增长趋势。据有关资料显示,我国已建成铁路隧道5300余座,总长度约4000km;公路隧道1800余座,总长度约750km,是世界上隧道工程最多的国家。其特点主要表现在单孔隧道长度纪录不断被刷新;施工技术难度和技术含量不断加大;大断面、多孔连拱和小净距
With the increase of investment in national transportation infrastructure and people’s increasing emphasis on environmental protection, the construction of tunnel projects shows a large growth trend. According to relevant information, China has built more than 5,300 railway tunnels with a total length of about 4000km. There are more than 1,800 road tunnels with a total length of about 750km. It is the country with the largest tunneling projects in the world. Its characteristics are mainly reflected in the continuous record of the length of the single-hole tunnel being refreshed; the technical difficulty and technical content of the construction technology are constantly increasing; large cross-sections, porous arches and small spacing