| 盾构隧道平行侧穿诱发的建筑纵向沉降实测与模拟分析 |
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| 引用本文： | 戴轩,郭旺,程雪松,霍海峰,刘国光.盾构隧道平行侧穿诱发的建筑纵向沉降实测与模拟分析[J].岩土力学,2021(1):233-244. |
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| 作者姓名： | 戴轩 郭旺 程雪松 霍海峰 刘国光 |
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| 作者单位： | ;1.中国民航大学机场学院;2.天津市市政工程设计研究院;3.天津大学滨海土木工程结构与安全教育部重点试验室 |
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| 基金项目： | 国家自然科学基金项目(No.51808548);中央高校基本科研业务费项目(No.3122018C017);天津市企业科技特派员项目(No.20YDTPJC00750)。 |
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| 摘 要： | 当盾构隧道平行侧穿建筑物时,大多关注建筑物的横向沉降规律,对其纵向沉降关注较少。为此,针对盾构隧道平行侧穿建筑物引发的空间变形开展研究。首先,对天津地铁6号线平行侧穿四座结构形式相近的砖混建筑的实测数据进行分析,得到建筑物基本变形模式;基于工程实测并考虑土体的小应变硬化特性建立三维有限元数值分析模型,研究了盾构侧穿引发的建筑物纵向挠曲、土体变形与应力变化规律,并分析了不同建筑平面长宽比的影响。结果表明,盾构隧道平行侧穿将诱发平面长宽比较大的建筑出现"下凹式"挠曲变形,纵墙中部沉降最大可为其角点沉降的2倍,平行侧穿并不能简化为平面应变问题进行分析。建筑物修建和盾构开挖将导致隧道上方土体经历较为复杂的应力变化过程,并可划分为6个阶段。沿建筑纵向基础中部的土体与边缘土体相比,其首先经历更大的压缩变形(建筑施工导致),在盾构穿越后又产生了更大的卸荷变形。当建筑平面长宽比小于2时,盾构开挖导致的纵向挠曲变形将显著减小。
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| 关 键 词： | 盾构隧道 侧穿 建筑沉降 有限元法 小应变硬化模型 |
Field measurement and numerical analysis for evaluating longitudinal settlement induced by shield tunneling parallel to building |
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| DAI Xuan,GUO Wang,CHENG Xue-song,HUO Hai-feng,LIU Guo-guang.Field measurement and numerical analysis for evaluating longitudinal settlement induced by shield tunneling parallel to building[J].Rock and Soil Mechanics,2021(1):233-244. |
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| Authors: | DAI Xuan GUO Wang CHENG Xue-song HUO Hai-feng LIU Guo-guang |
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| Institution: | (College of Airport Engineering,Civil Aviation University of China,Tianjin 300300,China;Tianjin Municipal Engineering Design and Research Institute,Tianjin 300392,China;MOE Key Laboratory of Coast Civil Structure Safety,Tianjin University,Tianjin 300072,China) |
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| Abstract: | The transverse settlement induced by the construction of a parallel shield tunnel alongside the building has raised considerable attention, whereas few studies focus on the longitudinal settlement. Therefore, the spatial deformation of ground developed from this tunneling form is investigated. In this study, some field measurements from the shield tunnel section of Tianjin Metro Line 6 parallel to four similar masonry buildings in vicinity are analyzed first, and the deformation pattern is established. Then, a hardening soil model calibrated against field measurement, considering small strain stiffness, is implemented in a three-dimension finite element simulation to evaluate the longitudinal deflection of the buildings, the ground deformation, and the soil stress distribution. Additionally, the effect of building aspect ratio is discussed. The simulation results show that tunneling-induced sagging deformation develops along the longitudinal direction of the building, and the settlement at the middle of a longitudinal wall is twice of that at the corners. Therefore, the study of tunneling parallel to buildings cannot be simplified to a plane strain problem. The building construction and tunneling activity result in the soil above the tunnel crown experiencing a complicated stress history, which can be divided into six stages. In longitudinal direction, compared with the part below the building foundation corners, the soil in the middle initially behaves larger compressive deformation due to building construction, followed by greater unloading deformation caused by tunnel excavation. In addition, the longitudinal sagging is significantly reduced for the buildings with aspect ratio less than 2. |
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| Keywords: | shield tunneling parallel tunneling building settlement finite element method(FEM) HS-Small model |
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