Abstract: In recent years, the world has witnessed a rapid development of tunneling technology, and many great tunnel projects have been built with technological breakthroughs. The apparent development trend is that the tunneling projects are becoming more safe, economical, green, and artistic. In many aspects, significant progress has been made, such as theoretical research, engineering design, energy saving and emission reduction, application of new materials, and other fields. The main development and progress of world tunneling technology are summarized as follows. (1) The mechanized fullface excavation of a soft rock tunnel is realized by providing advanced reinforcement. (2) A singlelayer concrete lining can be applied to the hard rock or even soft rock tunnels with good geologies. (3) The reinforced concrete segments can be partly or fully replaced by fiber concrete ones. (4) Tunnels with multiple functions, such as drainage plus highway tunnels and metro plus highway tunnels, can be realized. (5) Tunnels can supply heat for surrounding buildings. (6) Tunnels and underground works should be designed according to the surrounding environment, and any extra decoration should be reduced to realize perfect matching between concrete structures and facilities based on artistic design. It is suggested that China′s tunneling advantage in the quantity of tunnels built should be made use of to achieve advantages in quality, innovation, and costeffectieness, thus transforming the "highspeed" development to "highquality" development.

Key words: world tunneling, lining, large crosssection excavation, fiber concrete segment, multifunctional tunnel, energy tunnel