闹市区大断面地铁车站钻爆开挖及振动控制

Drill-blast Excavation and Vibration Control of the Large-section Metro Station in Urban Areas

城市地区地铁车站钻爆法开挖施工,将对周边建筑物和人员产生较大影响甚至造成危害。文章以重庆轨道交通环线洪湖东路车站钻爆法施工为例,详细阐述了爆破方案及爆破参数的设计,通过采用断面分部开挖、三级楔形掏槽、预裂爆破和逐孔爆破网路等技术措施,最大限度减少地表沉降和爆破地震强度对周边环境的影响。实践表明,地铁车站开挖采用本文提出的综合技术措施能显著降低爆破振动,减少钻爆施工对围岩的扰动,确保周边建筑物和人员安全。

Drill and blast construction of the metro station in urban areas has large effect and even damage on surrounding buildings and personnel.Taking the drill and blast excavation of the Honghu East Road station of Chongqing rail transit loop line as an example,the blasting scheme and design parameters were described in detail,main technical measures of partial excavation,three-stage wedge-shaped cut,pre-splitting blasting and hole-by-hole initiating network were taken in order to reduce effects of ground settlement and blasting vibration on surroundings to the maximum extent.Practice shows that the comprehensive technical measures for construction of the metro station can significantly reduce the blasting vibration and disturbance of surrounding rock,guaranteeing the safety of surrounding buildings and personnel.