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依托济南市轨道交通R1线玉符河站-王府庄站区间隧道浅覆土长距离穿越城市主干道(刘长山路)工程,提出了一种无碍交通、节能环保、产业化水平高、环境污染小的绿色快速装配式区间隧道施工新方法——桩洞法,并详细研究了采用围岩自稳放坡+机械护盾支撑的掌子面变形控制方案.研究结果表明:不同的放坡角度工况下,掌子面安全性能指数不同;随着放坡角度从40°增至45°、50°、60°,最危险滑动面安全系数从1.649逐渐减至1.528、1.408、1.221;随着护盾前插长度的增加,坡体安全系数、坡顶沉降和坡面水平位移变化不敏感.当放坡角度为60°+护盾前插深度为1.0m时,掌子面变形安全系数为1.19,确保了掌子面开挖的安全可控;研究成果可为类似条件下掌子面稳定控制提供依据.
Relying on the project of Jinan Fuyuanhe Railway Station - Wangfuzhuang Station Tunnel with Overlying Subsoil Crossing the Urban Main Road (Liu Changshan Road) for a long time, this paper puts forward a project that is free from traffic, energy saving and environmental protection, with high level of industrialization and environmental pollution Small green rapid assembly interval tunnel construction new method - pile-hole method, and a detailed study of the use of self-stabilizing rock slope + mechanical shield support face deformation control program.The results show that: different grazing angle Under the working conditions, the safety performance index of the face is different. As the grading angle is increased from 40 ° to 45 °, 50 ° and 60 °, the safety factor of the most dangerous sliding surface is gradually reduced from 1.649 to 1.528, 1.408 and 1.221; When the grazing angle is 60 ° and the pre-shield depth is 1.0m, the safety factor of face deformation is 1.19 to ensure the safe controllability of the excavation of the face; the research results can provide the basis for the stable control of the face under similar conditions.