施有志, 王晨飞, 赵花丽, 等. 2021. 海底盾构隧道掘进过程数值模拟研究[J].工程地质学报, 29(6): 1887-1897. doi: 10.13544/j.cnki.jeg.2021-0165.
    引用本文: 施有志, 王晨飞, 赵花丽, 等. 2021. 海底盾构隧道掘进过程数值模拟研究[J].工程地质学报, 29(6): 1887-1897. doi: 10.13544/j.cnki.jeg.2021-0165.
    Shi Youzhi, Wang Chenfei, Zhao Huali, et al. 2021. Numerical simulation of subsea shield tunneling process[J].Journal of Engineering Geology, 29(6): 1887-1897. doi: 10.13544/j.cnki.jeg.2021-0165.
    Citation: Shi Youzhi, Wang Chenfei, Zhao Huali, et al. 2021. Numerical simulation of subsea shield tunneling process[J].Journal of Engineering Geology, 29(6): 1887-1897. doi: 10.13544/j.cnki.jeg.2021-0165.

    海底盾构隧道掘进过程数值模拟研究

    NUMERICAL SIMULATION OF SUBSEA SHIELD TUNNELING PROCESS

    • 摘要: 为精确模拟海底盾构隧道掘进过程的施工力学效应,以厦门地铁2号线海底盾构段工程为依托,建立盾构机-注浆体-围岩-海水相互作用的三维数值模型,全面考虑施工影响因素,如开挖面泥水压力、千斤顶推力、盾构机超挖、机身与土体相互作用、注浆压力、海水压力、壁后注浆的时空变化性质等,通过计算结果与实测的验证后,对开挖面支护压力、地层损失率、注浆压力和千斤顶力等4种因素进行参数变化分析。结果表明:初期管片水土压力受到的施工扰动较为强烈,之后先大幅快速下降,降幅在100kPa左右,再缓慢降低,降幅在20kPa左右,最后趋于稳定;开挖面支护压力设为320kPa左右最为合理,增大支护压力,仅对开挖面前方一定范围内土体变形有影响,由于埋深较大,对地表竖向位移基本没有影响;地层损失率对地层沉降、管片上浮及管片内力的影响较大,随着地层损失率增大1%,地表沉降增大241.3%,管片上浮量降低38.2%,弯矩减少23.9%;注浆压力对管片上浮和管片内力有较大影响,注浆压力增大10%,管片上浮量增大32.1%,弯矩增大24.3%;千斤顶力主要对沿隧道轴向的管片轴力有一定影响,对管片上浮和管片弯矩影响很小。研究成果可为管片结构设计及海底盾构施工参数控制提供更加合理的参考建议。

       

      Abstract: To accurately simulate the construction mechanical effects of the subsea shield tunneling process, this study develops a three-dimensional numerical model of shield machine-grouting body-surrounding rock-seawater interaction based on the subsea shield section of Xiamen Metro Line 2. By validating the analysis results with measured data of the project, the effects of four main factors(excavation face support pressure, formation loss rate, grouting pressure, and jacking force) are further investigated. The results show that the water and soil pressure of the segment is strongly disturbed by the construction at the initial stage, and then decreases sharply and rapidly at a decrease of about 100kPa, and then decreases slowly at a decrease of about 20kPa, and finally tends to be stable. It is most reasonable to set the support pressure of the excavation face at about 320kPa. The increase of the support pressure only affects the soil deformation within a certain range in front of the excavation. Due to the large buried depth, the vertical displacement of the surface is basically not affected. The ground layer loss rate has a great influence on ground settlement, segment buoyancy, and segment internal force. As the stratum loss rate increases by 1%, the surface subsidence increases by 241.3%, the segment buoyancy decreases by 38.2% and the bending moment decreases by 23.9%. The grouting pressure has a great influence on segment buoyancy and internal force. The grouting pressure increases by 10%, segment buoyancy increases by 32.1%, and bending moment increases by 24.3%. The study also demonstrates that the jacking force has a certain influence on the axial force of the segment along the tunnel axis but has little influence on the segment floating and bending moment. This research provides a reliable analysis of the construction mechanical effects of the subsea shield tunneling process, which has an in-depth influence on the segment structure design and subsea shield construction parameter control.

       

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