既有线构(建)筑物旁控制爆破技术

Controlled Blasting near Existing Railway Buildings and Structures

重庆轻轨三号线一期工程火车客站紧邻铁路既有线建筑物,详细介绍了基坑施工中采用浅孔微震爆破进行分层开挖、周边增打减震孔、预留光爆层、再辅以覆盖和围档等降低爆破震速和防止爆破飞石的工程措施,并在爆破中进行了震动速度的监测和观测。既满足了施工进度又确保了建筑物的安全。

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-bylayer 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.