文档介绍：新奥法英文文献翻译 NATM tunnel design principle in the construction of major and Construction Technology NATM Design Principle design and construction of two major theoretical and development process Since the 20th century, human space on the ground floor of the growing demand, thus the underground works of the study ofa rapid development. Ina large number of underground engineering practice, it is generally recognized that the tunnel and underground cavern project, the core of the problem, all up in the excavation and retaining two key processes. How excavation, it will be more conducive to the stability and cavern facilitate support : For more support, supporting how they can more effectively ensure stability and facilitate the cavern excavation. This is the tunnels and underground works two promote each other and check each other's problems. Tunnels and underground caverns, and focusing on the core issues with the above practice and research, in different periods, People of different theories and gradually established a system of different theories, Each system includes theory and resolve (or are studying the resolution) from the works of understanding (concept), mechanics, engineering measures to the construction methods (Technology), a series of engineering problems. A theory of the 20th century the 1920s the traditional "load relaxation theory." Its core content is:a stable rock self-stability, no load : unstable rock may have collapsed. need shoring structure to be supported. Thus, the role of the supporting structure of the rock load is within a certain range may be due to relaxation and collapse of rock gravity. This isa traditional theory, and their representative is Taishaji and Principe's and others. It works similar to the surface issues of the thinking is still widely used to. Another theory of the 20th century made the 1950s the modern theory of timbering or "rock for the theory." Its core content is: rock stability is clearly bearing rock to th