According to the Yangzhou network reported: in the national 5A level Shu gang - the core area of the Slender West Lake scenic area of Yangzhou Slender West Lake tunnel length of 3.6 kilometers, design into 2 layers of two-way four lane, with large section shield machine construction of up to 14.93 meters in diameter, is the largest span in the world single hole double layer of highway tunnel. From the song clip travel time from the ruins of the ancient city of West Lake, from the past half hour shortened to 3 minutes, to become a "center line" through the ancient city of Yangzhou things, greatly ease the traffic pressure of tourism scenic area.
Chinese Railway Construction Bureau Group fourteen Slender West Lake tunnel project commander Dai Hongwei, the equivalent of five storey super large diameter shield machines through commonly known as the "old clay" section of the whole hard plastic clay layer, particles less than 0.5 microns in soil accounted for more than 90%, the formation of water easily on the cutter head into the mud cake, cause the mud pipe is blocked, if the down time is too long, easily causing the collapse of engineering technical difficulty and the risk of rare in the world.
