1.3　Structure of CRTS Ⅱ Slab Ballastless Track in Tunnel

The track structure in tunnel is 779mm high（top inner rail surface to bottom base surface）；the design thickness of cement emulsified asphalt mortar is 30mm；all the track slabs are standard track slab with 6450mm long and 2550mm wide，and shall continuously laid；the structure of supporting layer is the same as that of subgrade，its thickness is 300mm in straight line section，and the height in curve section is determined by ultrahigh value；false suture（expansion joint）shall be set on supporting layer，and the false suture spacing is about 5m.Drainage ditches shall be set in lines and at both sides of the line；the drainage shall be realized by line longitudinal slope and water collecting well.The track structure of straight line section（without inverted arch）in tunnel is shown in Figure 3.