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    既有建筑对极软岩地层中土压盾构的施工影响

    王晓睿 蔡松 杨伟 郑培信

    王晓睿, 蔡松, 杨伟, 郑培信, 2022. 既有建筑对极软岩地层中土压盾构的施工影响. 地球科学, 47(4): 1483-1491. doi: 10.3799/dqkx.2020.326
    引用本文: 王晓睿, 蔡松, 杨伟, 郑培信, 2022. 既有建筑对极软岩地层中土压盾构的施工影响. 地球科学, 47(4): 1483-1491. doi: 10.3799/dqkx.2020.326
    Wang Xiaorui, Cai Song, Yang Wei, Zheng Peixin, 2022. Influence of Existing Buildings on Construction of Earth Pressure Shield in Extremely Soft Rock Stratum. Earth Science, 47(4): 1483-1491. doi: 10.3799/dqkx.2020.326
    Citation: Wang Xiaorui, Cai Song, Yang Wei, Zheng Peixin, 2022. Influence of Existing Buildings on Construction of Earth Pressure Shield in Extremely Soft Rock Stratum. Earth Science, 47(4): 1483-1491. doi: 10.3799/dqkx.2020.326

    既有建筑对极软岩地层中土压盾构的施工影响

    doi: 10.3799/dqkx.2020.326
    基金项目: 

    河南省科技攻关项目 182102210062

    河南省交通运输厅横向项目资助 2020J5

    详细信息
      作者简介:

      王晓睿(1975-),男,教授,主要从事数值计算的研究及其岩石裂纹扩展方面的应用.ORCID:0000-0001-5686-4332. E-mail:wxrui203@163.com

    • 中图分类号: P642

    Influence of Existing Buildings on Construction of Earth Pressure Shield in Extremely Soft Rock Stratum

    • 摘要: 基于土压盾构在极软岩地层中近距离下穿既有建筑的背景,采用ABAQUS有限元数值模拟与现场实测相结合的方法,从地表和建筑物竖向位移变化及其控制的角度出发研究既有建筑对盾构施工的影响.实测结果表明:地表和建筑物在盾构下穿过程中会呈现出先隆起后沉降的趋势,其中在盾尾脱出阶段地表和建筑物会产生较大速率的沉降.数值模拟结果表明:建筑物改变了地层原有的应力场,使地表最终沉降峰值向靠近建筑物方向偏移并增大,沉降槽宽度也在一定程度上增大.本研究对于土压盾构穿越地层敏感区域具有较强的理论指导意义.同时,在工程实践方面,也对土压盾构采用施工参数调节与补强注浆来进行沉降控制提出了具体的指导方案.

       

    • 图  1  隧洞与建筑物平面关系示意(单位:m)

      Fig.  1.  Schematic diagram of the plane relationship between the tunnel and the building (unit: m)

      图  2  隧洞与建筑物剖面关系示意(单位:m)

      Fig.  2.  Schematic diagram of the cross-sectional relationship between the tunnel and the building (unit: m)

      图  3  观测方案平面示意图(单位:m)

      Fig.  3.  Schematic diagram of the plane of the observation project(unit: m)

      图  4  观测方案剖面示意图(单位:m)

      Fig.  4.  Schematic diagram of the cross-section of the observation project(unit: m)

      图  5  地表竖向位移实测历程曲线

      Fig.  5.  The monitoring process curve of the vertical displacement of the ground surface

      图  6  盾构穿越段的5个特征位置

      Fig.  6.  Five characteristic positions of shield tunneling

      图  7  不同特征位置处的现场实测值

      Fig.  7.  On-site monitoring values under different characteristic positions

      图  8  计算模型网格

      Fig.  8.  Computational model grid

      图  9  建筑物存在时的平衡应力场(a)和无建筑物存在时的平衡应力场(b)

      Fig.  9.  The equilibrium stress field when the building exists (a) and the equilibrium stress field when there is no building (b)

      图  10  建筑物存在时的地表竖向位移云图(a)和无建筑物存在时的地表竖向位移云图(b)

      Fig.  10.  Cloud map of surface vertical displacement when buildings exist (a) and when there is no building (b)

      图  11  P-P'断面地表竖向位移对比分析曲线

      Fig.  11.  Comparative analysis curve of surface vertical displacement of P-P' section

      图  12  建筑物竖向位移动态变化对比分析曲线

      Fig.  12.  Comparative analysis curves of the dynamic change of the vertical displacement of the building

      表  1  模型材料参数

      Table  1.   Material parameters of the model

      材料名称 密度(g/cm3 弹性模量(GPa) 泊松比$ \mu $ C(kPa) φ(°) 厚度(m)
      人工填土 1.75 0.02 0.18 5 10 0.50
      粉质黏土 1.90 0.05 0.32 30 16 5.50
      极软岩1 2.10 0.30 0.30 50 22 18.40
      极软岩2 2.20 0.50 0.31 65 19 15.60
      注浆层 1.90 9×10-4 0.40 0.10
      盾壳 7.50 205.00 0.30 0.10
      衬砌 2.10 28.00 0.30 0.35
      条形基础 2.50 20.00 0.20 2.00
      下载: 导出CSV
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    出版历程
    • 收稿日期:  2020-09-30
    • 网络出版日期:  2022-04-29
    • 刊出日期:  2022-04-25

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