摘要
针对硬岩地铁隧道在TBM(Tunnel Boring Machine)施工过程中穿越破碎带等不良地质体,易导致TBM卡机、冒顶垮落和突涌水等问题,以青岛地铁某区间穿越李村河下破碎带段为工程背景,采用数值模拟、数据统计与现场监测数据验证相结合的研究方法,分析隧道穿越破碎带时的围岩变形规律,优化设计破碎带注浆加固方案。同时,基于施工统计数据确定TBM施工控制参数,最后结合监测数据验证“地面深孔全断面注浆+精细化掘进参数控制”方案的可靠性。应用FLAC~(3D)数值分析软件,研究TBM穿越河下破碎带围岩力学响应,分析围岩稳定性,破碎带区域以外的围岩变形很小,而破碎带以内围岩产生了较大的变形,其中拱顶沉降最大可达11.82 mm,超出施工预警要求。提出破碎带地表深孔注浆加固方案,注浆体驱替破碎带内的地下水使得TBM穿越破碎带时不易产生突涌水等灾害,确定最优注浆加固范围为10.3 m,河流破碎带下注浆选用水泥-水玻璃双液浆,注浆压力为1.5 MPa,水泥浆水灰比为1∶1。根据统计分析得出了TBM穿越河流破碎带时的掘进参数变化规律,结合试掘进监测数据确定了合理的双护盾TBM掘进控制参数。最终监控量测结果表明,最大地表沉降值为3.75 mm,该施工方案有效保障了双护盾TBM穿越大范围河流破碎带区域的施工安全。研究结果可为类似下穿河流的盾构隧道提供理论指导。
In response to the challenges posed by adverse geological formations such as broken zones during TBM construction in hard rock subway tunnels,which can lead to problems such as TBM jamming,roof collapse,and water influx,this study focused on the Li Village River crossing broken zone section of Qingdao Metro as the engineering background.It adopted a research method that combines numerical simulation,data statistics,and field monitoring data verification to analyze the deformation characteristics of the surrounding rock when crossing the broken zone,optimized the grouting reinforcement scheme for the broken zone,and determined the TBM construction control parameters based on construction statistics.Finally,the reliability of the“deep-hole full-section grouting+refined excavation parameter control”scheme was verified based on monitoring data.By using FLAC3D numerical analysis software,the mechanical response of the surrounding rock when the TBM crosses the river under the broken zone was studied.The stability of the surrounding rock was analyzed.The deformation of the surrounding rock outside the broken zone was minimal,while significant deformation occurs inside the broken zone,with a maximum arch settlement of up to 11.82 mm,exceeding the construction warning requirements.A grouting reinforcement scheme for the broken zone was proposed,where the grout displaced the groundwater inside the broken zone,making it less prone to disasters such as water influx during TBM crossing.The optimal grouting reinforcement range was determined to be 10.3 m.Cement-sodium silicate dual-fluid grout was generally used for grouting under the river broken zone,with a grouting pressure of 1.5 MPa and a water-cement ratio of 1:1.The variation of excavation parameters when the TBM crosses the river broken zone was determined through statistical analysis.The reasonable control parameters for the double-shield TBM were determined based on trial excavation monitoring data.The final monitoring results show that the maximum ground settlem
作者
李志军
王明年
于丽
张霄
王志龙
上官宇文
LI Zhijun;WANG Mingnian;YU Li;ZHANG Xiao;WANG Zhilong;SHANGGUAN Yuwen(Key Laboratory of Tunnel Engineering of the Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Tunnel Group Co.,Ltd.,Guangzhou 511458,China)
出处
《铁道科学与工程学报》
EI
CAS
CSCD
北大核心
2024年第11期4612-4623,共12页
Journal of Railway Science and Engineering
基金
山东省自然科学基金资助项目(ZR2021QE187)。
关键词
TBM施工
下穿河流
破碎带
注浆加固
掘进控制参数
tunnel boring machine construction
undercrossing river
fracture zone
grouting reinforcement
driving control parameters
