卵石-漂石地层盾构隧道穿越铁路编组工程技术研究  

Research on the Technology for the Shield Tunnel Crossing the Railway Marshalling Station in the Pebble-boulder Stratum

作　　者：刘招伟 LIU Zhaowei(China Railway Electrification Engineering Group Co.,Ltd.,Beijing 100036)

机构地区：[1]中铁电气化局集团有限公司,北京100036

出　　处：《现代隧道技术》2022年第4期226-233,共8页Modern Tunnelling Technology

摘　　要：在卵石-漂石地层中修建盾构隧道下穿运营铁路线路时,需要采取安全防护措施来减小对正常铁路运营的影响。依托北京地铁16号线榆-宛区间隧道穿越丰西铁路编组工程实例,系统分析了施工中的难点,阐述了盾构隧道穿越铁路编组时采取的刀具优化改造、渣土改良方案和掘进参数优化设置等措施,介绍了对铁路采取注浆加固、线路扣轨等防护措施的要点和工艺流程,并使用FLAC 3D模拟了盾构隧道穿越的全过程,对工程防护措施的有效性和必要性进行了分析。结果表明:对盾构隧道穿越区域铁道下方的土层进行注浆加固能有效阻隔盾构施工扰动向上传递,加固后地表垂直变形明显减小,铁路线路变形控制在安全范围内,验证了工程防护措施的有效性。When a shield tunnel crossing under an operating railway line is constructed in the pebble-boulder stratum, safety protection measures shall be taken to reduce the impact on the normal operation of the railway. Taking the running tunnel project from Yushuzhuang Station to Wanpingcheng Station in Line 16 of the Beijing Subway crossing Fengtai West Railway Marshalling Station as an example, the difficulties in construction were systematically analyzed, the measures for the shield tunnel crossing the railway marshalling station(e.g. cutter optimization and modification, muck conditioning scheme, and setting of tunneling parameters) were described, the key points and technological processes of protective measures for the railway(e.g. grouting reinforcement and rail fastening) were introduced, FLAC 3D was used to simulate the full process of shield tunnel crossing, and the effectiveness and necessity of engineering protection measures were analyzed. The calculation results showed that the grouting reinforcement that was carried out for the soil layer above which the shield tunnel crossed the regional railway could effectively block the upward transfer of shield construction disturbances, and after reinforcement, the vertical surface deformation was significantly reduced, and the railway line deformation was controlled within the safety range, which verified the validity of engineering protection measures.

关 键 词：盾构隧道 穿越施工 掘进参数 铁路编组 工程措施 数值模拟 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]