重庆轨道交通五号线石新路站—石桥铺站区间隧道属矿山法小净距双洞隧道，下穿众多建筑物。采用节能环保水压爆破技术，辅以分部、分次施工方法，结合延时爆破控制技术，通过不断优化钻爆设计参数，加密减振孔数量或加大直径，利用水压爆破降尘减振优点，采取信息化监测技术手段，控制爆破振动对环境影响。通过优化钻爆设计，有效控制爆破振速，现场监测结果表明，爆破振速达标可控。为解决隧道下穿建筑物爆破振速控制技术难题，采用减振孔+水压爆破+延时爆破技术，得出结论即最大振速集中在掏槽眼，其中3个方向振速垂向最大、径向次之、切向最小，且隧道下穿后比建筑物正下方振速大，采用水压爆破比常规爆破振速降低13%～22%，增设减振孔比水压爆破振速降低16%～28%。

The mined small clear spacing twintube tunnel on Shixinlu StationShiqiaopu Station on Line No. 5 of Chongqing railway transit crosses many buildings. The influence of blasting vibration on environment is studied; and a series of technologies, such as energy conservation and environmental protection hydraulic blasting, step by step construction, millisecond controlled blasting, blasting parameter optimization, vibration reduction hole increasing and enlarging and informationization monitoring, are adopted. The blasting vibration velocity has been brought under effective control by optimizing drilling and blasting parameters. Some conclusions are drawn as follows: 1) The blasting vibration velocity at the cut eye is the largest; the vibration velocity along longitudinal direction is the largest, followed by that along radial direction, and that along tangent direction is the smallest; and the blasting vibration velocity before tunnel crosses underneath building is smaller than that after tunnel crosses underneath buildings. 2) Compared to traditional blasting, the blasting vibration velocity induced by hydraulic blasting can be reduced by 13%-22%; compared to hydraulic blasting, the blasting vibration velocity induced by increasing vibration reduction hold method can be reduced by 16%-28%.