The seismic wave caused by blasting in new tunnel’s construction will influence safety and stability of adjacent existing tunnel lining structures. Combining new construction of Bi Ji Guan tunnel project and use strain sensors on 15 fiber Bragg gratings（ FBG） surface to monitor strains

which caused by 8 times of blasts and 3 times of train gets through respectively of Bijiguan tunnel lining surface of the blasting side. Influence of blasts on strain surface of adjacent tunnel lining structures is also studied. On June 23

2010

explosive is 129 kg which is medium

and blasts produced obvious fluctuations about strains on the surface of lining structures and caused data mutation in the sensors after

blasting

and the maximum mutation is between 35 × 10- 6

43 × 10- 6. When the train is passing through the tunnel

the maximum mutation is between 9 × 10- 6

12 × 10- 6.