Abstract:

The development of tunnel and underground works in China in recent two years is summarized as follows: 1) The quantity and total length of railway tunnel, highway tunnel, Metro tunnel and water supply tunnel increase rapidly. 2) Some of the key and difficult tunnels and underground works, i.e. Guanjiao Tunnel on QinghaiTibet Railway, Qilianshan Tunnel on LanzhouXinjiang Highspeed Railway, Muzhailing Tunnel on LanzhouChongqing Railway, Underground Watersealed LPG Cavern in Yantai and Tianping Tunnel on LanzhouGuiyang Highspeed Railway, have been completed; and some, i.e. immersed tunnel of Hong KongZhuhaiMacao Bridge, Songhua River Water Conveyance Tunnel, Hanjiang RiverWeihe River Water Conveyance Tunnel, Yangtze Rivercrossing Tunnel on Sanyang Road in Wuhan, Gaoligongshan Tunnel on DaliRuili Railway, Badaling Underground Station of BeijingZhangjiakou Highspeed Railway, underground watersealed oilstorage cavern in Huizhou, underground watersealed oilstorage cavern in Zhanjiang and underground utility tunnel in Hengqin District in Zhuhai, are under construction. Technologies, i.e. construction technologies for superlong mountaincrossing tunnel, control technologies for large deformation of soft rock tunnel, construction technologies for tunnel with high gas concentration, countermeasures for rockburst and design and application of large crosssection rectangular pipe jacking and shield, and mechanized construction level have reached great achievement. The construction technologies for tunnels and underground works in China are advanced 〖HJ2.1mm〗internationally. New requirements have been proposed by new urbanized construction, new round of Western Development, the Belt and Road, the Sponge City, urban underground utility tunnel, urban rail transit, coordination development of Beijing, Tianjing and Hebei, the Yangtze River Economic Zone and the Pearl River Delta Economic Zone. Finally, the author provides the developing directions of tunnels and underground works in China, which are construction technologies for superlong tunnel, control technologies for large deformation of high ground stress and soft rock tunnel, construction technologies for high water stress and large crosssection underwater tunnel, construction technologies for tunnels with high ground temperature and high geothermy, construction technologies for tunnels in sections with high seismic intensity and active tectonic zone, operation, maintaining and management technologies for tunnels and development and application of new materials.

Key words: tunnel, underground works, railway tunnel, highway tunnel, Metro tunnel, water supply tunnel, underground station, underground energy storage cavern, urban underground utility tunnel, mountaincrossing tunnel, large deformation of soft rock, gas tunnel, rockburst, rectangular pipe jacking, rectangular shield, river/seacrossing tunnel, urban rail transit, deepburied tunnel