浅埋暗挖地铁隧道下穿建筑物施工工法研究

在浅埋暗挖隧道施工中,以超前地质预报和钻探为基础,洞内超前深孔注浆、地面袖阀管注浆加固为核心,严格控制开挖进尺与爆破振速,施工中对地表沉降、建筑物沉降、拱顶沉降、净空收敛等项目持续监测,各监测项目变形均在允许的范围之内,施工技术可为类似工程的施工提供参考。

Construction Techniques of a Shallow Buried Metro Tunnel under Passing the Existing Buildings

This paper presents a case history of the excavation techniques of a shallow buried metro tunnel under passing the ex- isting building. Based on the geological condition prediction and the test boring information, the tunnel excavation utilizes the deep hole grouting at the excavated face and sleeve-valve-pipe grouting at the ground surface. Both the excavated dimension and the vibration peak particle velocity from the blasting are strictly controlled. In addition, the deformations at different locations, such as, ground surface, crest of the excavated tunnel, as well as the net clearance within the tunnel, are monitored during the excavation. The results indicate that the deformations are well under the permissible values.