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矩形顶管管周差异摩阻力对地层纵向水平位移的影响

兰彬 张鹏 张云龙 闫雪峰

兰彬, 张鹏, 张云龙, 闫雪峰. 矩形顶管管周差异摩阻力对地层纵向水平位移的影响[J]. 地质科技通报, 2022, 41(3): 215-221. doi: 10.19509/j.cnki.dzkq.2022.0031
引用本文: 兰彬, 张鹏, 张云龙, 闫雪峰. 矩形顶管管周差异摩阻力对地层纵向水平位移的影响[J]. 地质科技通报, 2022, 41(3): 215-221. doi: 10.19509/j.cnki.dzkq.2022.0031
Lan Bin, Zhang Peng, Zhang Yunlong, Yan Xuefeng. Influence of differential frictional resistance around rectangular pipe jacking on longitudinal horizontal displacement of strata[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 215-221. doi: 10.19509/j.cnki.dzkq.2022.0031
Citation: Lan Bin, Zhang Peng, Zhang Yunlong, Yan Xuefeng. Influence of differential frictional resistance around rectangular pipe jacking on longitudinal horizontal displacement of strata[J]. Bulletin of Geological Science and Technology, 2022, 41(3): 215-221. doi: 10.19509/j.cnki.dzkq.2022.0031

矩形顶管管周差异摩阻力对地层纵向水平位移的影响

doi: 10.19509/j.cnki.dzkq.2022.0031
基金项目: 

国家自然科学基金项目 52008383

中央高校基本科研业务费专项资金项目 CUG190605

详细信息
    作者简介:

    兰彬(1997—),男,现正攻读土木水利专业硕士学位,主要从事非开挖顶管方向的研究工作。E-mail: LanBin0820@163.com

    通讯作者:

    张鹏(1988—),男,副教授,主要从事非开挖领域的科研和教学工作。E-mail: cugpengzhang@163.com

  • 中图分类号: TB22

Influence of differential frictional resistance around rectangular pipe jacking on longitudinal horizontal displacement of strata

  • 摘要:

    矩形顶管施工过程中管周摩阻力是引起周围土体扰动的重要影响因素。为了更加准确地预测矩形顶管施工对地层位移的影响,结合管节受力分析和泥浆运动规律,假定“U”字形泥浆套状态,基于弹性力学Mindlin解建立土体水平位移计算公式,对正面附加应力、管周摩阻力等因素引起的地层纵向水平位移进行计算,最后与苏州某矩形顶管工程实测值进行对比分析。结果表明:在顶管机头顶进穿过某一断面前,正面附加应力对周围土体的影响大于管周差异摩阻力,而在穿过该断面后,由于管节数量的增多以及已穿过部分的管节管周摩阻力产生的“拉力”作用,后者的累计影响占比逐渐大于前者;管周差异摩阻力情况下比管周均一摩阻力情况下的计算值更贴近实测值,预测效果更好。

     

  • 图 1  管浆土接触状态示意图

    μ1μ3分别为管节顶、底部摩擦系数

    Figure 1.  Schematic diagram of the contact state of pipe slurry soil

    图 2  管节外壁所受摩擦力示意图

    h1, h2分别为管节底部、顶部所处深度位置

    Figure 2.  Schematic diagram of the friction on the outer wall of the pipe

    图 3  力学及计算模型简图

    f0.机头各个侧面与土体摩擦力(kPa);f1.管节顶面与土体摩擦力(kPa);f2.管节左(右)侧面与土体(及泥浆)摩擦力(kPa);f3.管节顶面与泥浆摩擦力(kPa);p0.正面附加应力(kPa);A.顶管在水平方向的长度(m);B.顶管在垂直方向的长度(m);L0.机头长度(m);L1.后续管节总长度(m); h0.管节轴线与地表的距离(m)

    Figure 3.  Schematic diagram of the mechanics and calculation model

    图 4  机头穿过监测面前、后上覆土体受力情况示意图(K为监测断面里程)

    pf为2号土体单元所受3号土体单元提供的反力

    Figure 4.  Schematic diagram of the stress situation of overlying soil in front and after the machine head passing through monitoring

    图 5  各因素引起纵向水平位移累计占比变化图

    Figure 5.  Variation in the cumulative proportion of longitudinal and horizontal displacements caused by various factors

    图 6  两种工况下的地层纵向水平位移计算值与实测值对比

    Figure 6.  Comparison of teh calculated values and measured values of the vertical horizontal displacement of the strata under two working conditions

    表  1  地层参数一览

    Table  1.   List of strata parameters

    岩土类别 土层厚度/m 天然密度(kN·m-3) 压缩模量/MPa 孔隙比 压缩系数/MPa-1 内摩擦角/(°) 含水率/% 渗透系数/(cm·s-1)
    素填土 2.3 19.2 6.1 0.865 0.33 16.8 30.4 4.4×10-6
    黏土 3.3 19.9 7.4 0.737 0.24 15.7 26.2 1.9×10-7
    粉质黏土夹粉土 1.4 19.2 6.5 0.841 0.29 22.7 30.0 7.2×10-6
    粉砂夹粉土 3.0 19.1 9.4 0.836 0.20 31.4 30.2 2.9×10-3
    粉砂 5.4 19.4 9.7 0.789 0.19 33.4 28.9 3.8×10-3
    下载: 导出CSV

    表  2  计算参数汇总

    Table  2.   Summary of the calculation parameters

    平均重度γ/(kN·m-3) 侧向土压力系数k 泊松比μ 内摩擦角φ/(°) 黏聚力c/kPa
    19.4 0.45 0.3 27.2 19.9
    机头断面尺寸A0×B0×L0 管节断面尺寸A×B×L1 管节轴线埋深h/m 管节壁厚t/m 后续管节总长度L1/m
    9.12 m×5.52 m×6.14 m 9.1 m×5.5 m×1.5 m 11.75 0.65 0~255
    正面附加应力p0/kPa 顶管机与土体摩擦系数μ0 顶部管土摩擦系数μ1 底部管土摩擦系数μ3 压缩模量Es/MPa
    52 0.6 0.35 0.15 7.4
    下载: 导出CSV
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  • 收稿日期:  2021-07-20

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