Abstract:

The station of Passenger Railway Station on line 3 of Chongqing MRT system is located near existing railways and structures. In the paper, the author describes in detail the countermeasures adopted to minimize the blasting vibration velocities and flying rocks during the construction of the foundation pit of the MRT station, which include layerbylayer excavation by means of shorthole minivibration blasting technology, drilling additional vibrationreducing holes around the foundation pit, preserving smoothblasting layers, working area covering and protection. Furthermore, monitoring and observation are made on the vibration velocities during blasting. Due to the countermeasures adopted, the requirements of the construction schedule are satisfied and the safety of the structures is guaranteed.