土岩组合地层矿山法隧道下穿建筑群施工技术

Construction technology of mining tunnels passing through under building group in the combination of soil and rock layer

以青岛地铁3号线五四广场车站—江西路车站区间段为例,解决隧道下穿建筑群施工难度大的问题.采用矿山法施工,根据不同围岩情况,分别采用大直径中空孔减震爆破技术控制爆破振速、全断面深孔超前注浆止水预加固技术控制地表沉降等技术措施,解决了复杂地质条件下矿山法隧道下穿建筑群的施工安全问题.研究结果可为类似地铁、城市隧道等穿越工程提供有益借鉴和参考.

The difficulties of tunnel construction under building can be solved based on Metro Line 3 from May Fourth Square Station to Jiangxi Road Station in Qingdao. The mining method is adopted to solve the safety problems about mining tunnel construction under the complex geological condition. Absorbing blasting technology of large-diameter hollow and full-face deep hole advanced grouting consolidation technology are used to control the blas-ting vibration speed and surface sinking, respectively,according to different surrounding rock conditions. The research results can provide useful reference for similar projects such as subway and urban tunnel.