软土地层盾构隧道结构整体抬升实践

发布时间：2018-08-18 12:16

【摘要】：软土地层盾构施工易沉降过大导致轴线偏差,出现调坡困难,甚至影响后期列车运行速度,注浆抬升是轴线偏差治理的一种方法。宁波轨道交通某区间在施工过程中因对地层变化理解不彻底,导致沉降过大,调坡困难,为了不造成结构破坏,不影响工程工期,使隧道线型得到改善,对隧道结构整体抬升进行了实践。通过对地质情况分析,结构验算,注浆工艺研究,提出了下部注浆,内部支撑,实时监控,即时调整的思路,在注浆过程及时调整浆液。经过精细化管理,该区间最大稳定抬升量达3 cm。工程实践表明,注浆工艺和内部支撑对抬升阶段通用环管片结构安全起到重要作用,浆液的选择对后期稳定非常重要。该工程探索了软土地层盾构隧道不均匀沉降治理、控制措施,可为其他盾构隧道沉降治理提供参考和抬升设计提供依据。
[Abstract]:The settlement of shield tunneling in soft soil is easy to cause axis deviation, which makes it difficult to adjust slope, and even affects the train running speed in the later stage. Grouting uplift is a method to control the deviation of axis line. During the construction of a certain section of Ningbo rail transit, due to the incomplete understanding of the formation changes, the settlement is too large and it is difficult to adjust the slope. In order not to cause structural damage and not to affect the construction period, the tunnel alignment is improved. The whole uplift of tunnel structure is put into practice. Based on the analysis of geological conditions, structural calculation and grouting technology research, this paper puts forward the idea of lower grouting, internal support, real-time monitoring and immediate adjustment, and adjusts the slurry in time during the grouting process. After fine management, the maximum stable uplift of the interval is 3 cm. Engineering practice shows that grouting technology and internal support play an important role in the safety of general annular segment structure in uplift stage, and the selection of slurry is very important for later stability. The project explores the uneven settlement treatment and control measures of shield tunnel in soft soil, which can provide reference for other shield tunnel settlement control and design of uplift.
【作者单位】：宁波市轨道交通集团有限公司;同济大学交通运输工程学院;
【分类号】：U455.43

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