紧邻既有公路隧道进行新建铁路隧道的爆破掘进时,爆破对既有隧道衬砌等建筑设施造成危害,从而影响了公路隧道的安全运营.本项目施工时对控制隧道掘进爆破振动的技术措施进行了研究及探索,通过采用中空大直掏槽眼、调整开挖顺序、微差爆破、预裂切缝等减振技术及方法,并对爆破震动进行严密监测,以确保既有公路隧道的结构安全.%In excavation blasting construction of railway tunnel adjacent to the existing highway tunnel,blasting will harm existing tunnel lining and other construction facilities,thus affecting the safe operation of highway tunnel In the construction of this project,technical measures to control the blasting vibration in tunnel excavation are studied and explored,through the use of a large hollow straight cut hole,adjusting the excavation sequence,millisecond blasting,presplit seam mitigation and other techniques and methods for vibration attenuation,close monitoring of blasting vibration has been taken to ensure the safety of the existing highway tunnel structure.
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