Influence of ground-surface deformation in pipe jacking construction with parallel differential section
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摘要: 城市地下空间开发和交通的发展促使大断面顶管技术在城市隧道建设中得到了广泛推广应用，其中并行顶管隧道的功能要求不同，因此其断面形状和尺寸也各有差异。基于城市下穿主干道的双线并行差异大断面顶管隧道工程，建立有限元三维计算模型进行系统分析，同时结合现场顶管项目的实测成果，研究并行顶管差异断面及不同工序情况下地表变形的特性及其影响因素。研究结果表明并行差异断面顶管施工引起的地表变形曲线呈"Ⅴ"形，地表变形曲线的峰值点由大断面矩形顶管轴线逐渐转移至两管中心；小断面矩形顶管轴线左侧的地表沉降值较轴线右侧大；先施工大断面矩形顶管更有利于地表变形的控制；断面尺寸的变化对地表变形的影响幅度为30%，工序差异对地表变形的影响幅度为8%，断面尺寸差异对地表变形的影响比工序差异的影响大。并行差异断面顶管施工对地表变形影响研究可为今后相关并行大断面顶管工程提供理论基础和经验借鉴。Abstract: The development of urban underground space and traffic promotes the wide application of large section pipe jacking technology in urban tunnel construction.The functional requirements of parallel pipe jacking tunnel are different, so shapes and sizes of the section are also different.Based on the double-line parallel pipejacking tunnel with difference large section under through the main road in the city, a three-dimensional finite element calculation model is established for systematic analysis.At the same time, combined with the measured results of the field pipe jacking project, the characteristics and influencing factors of ground-surface deformation under different sections and different construction sequence of parallel pipe jacking are studied.The results show that the surface deformation curve caused by parallel differential section pipe jacking construction is Ⅴ-curve, and the peak point of the surface deformation curve gradually shifts from the large section rectangular pipe jacking axis to the two pipe centers.The surface settlement on the left side of the axis of the small section rectangular pipe jacking is larger than that on the right side of the axis.Construction of large section rectangular pipe jacking on the left line is more beneficial to control surface deformation.The influence of section size change on surface deformation is 30%, and the influence of process on surface deformation is 8%.The influence of section size difference on surface deformation is greater than that of process difference.The study on the influence of parallel differential section pipe jacking construction on surface deformation can provide theoretical basis and experience for future related parallel large section pipe jacking projects.
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图 7 两种工序下的横向地表变形曲线
Figure 7. Curves of transverse surface deformation under two construction sequences
图 8 双管贯通时的竖向位移云图
Figure 8. Vertical displacement cloud map with double pipe transfixon
图 12 横向地表变形模拟值与实测值对比
Figure 12. Comparison between simulated value and measured values of transverse surface deformation
表 1 土层力学参数
Table 1. Mechanical parameters of soil layer
地层名称 地层厚度/m 重度/(kN·m-3) 弹性模量/MPa 泊松比υ 黏聚力/kPa 内摩擦角φ/(°) 杂填土 3.1 17.0 15.0 0.35 10.0 10.0 淤泥 10.0 15.9 10.5 0.38 10.9 5.4 中砂 2.9 18.0 30.0 0.27 3.0 20.0 
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表 2 模型中其他材料参数
Table 2. Other material parameters in the model
材料名称 重度/(kN·m-3) 弹性模量/103 MPa 泊松比υ 顶管管节 25 34.5 0.2 顶管机 78 200 0.2
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表 3 模拟施工参数
Table 3. Simulating construction parameters
顶管类型 开挖面支护力/MPa 注浆压力/MPa 大矩形顶管 0.12 0.05 小矩形顶管 0.16 0.05
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