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基于透明土技术的桩后土拱效应特征分析

陈强 董桂城 王超 朱宝龙 赵晓彦

陈强, 董桂城, 王超, 朱宝龙, 赵晓彦. 基于透明土技术的桩后土拱效应特征分析[J]. 西南交通大学学报, 2020, 55(3): 509-517. doi: 10.3969/j.issn.0258-2724.20190744
引用本文: 陈强, 董桂城, 王超, 朱宝龙, 赵晓彦. 基于透明土技术的桩后土拱效应特征分析[J]. 西南交通大学学报, 2020, 55(3): 509-517. doi: 10.3969/j.issn.0258-2724.20190744
CHEN Qiang, DONG Guicheng, WANG Chao, ZHU Baolong, ZHAO Xiaoyan. Characteristics Analysis of Soil Arching Effect Behind Pile Based on Transparent Soil Technology[J]. Journal of Southwest Jiaotong University, 2020, 55(3): 509-517. doi: 10.3969/j.issn.0258-2724.20190744
Citation: CHEN Qiang, DONG Guicheng, WANG Chao, ZHU Baolong, ZHAO Xiaoyan. Characteristics Analysis of Soil Arching Effect Behind Pile Based on Transparent Soil Technology[J]. Journal of Southwest Jiaotong University, 2020, 55(3): 509-517. doi: 10.3969/j.issn.0258-2724.20190744

基于透明土技术的桩后土拱效应特征分析

doi: 10.3969/j.issn.0258-2724.20190744
基金项目: 国家自然科学基金(41672342,41672295)
详细信息
    作者简介:

    陈强(1967—),男,教授,博士,研究方向为岩土体稳定性及工程建设项目管理,E-mail:827348075@qq.com

    通讯作者:

    朱宝龙(1976—),男,教授,博士,研究方向为岩土体稳定性,E-mail:zhubaolong@126.com

Characteristics Analysis of Soil Arching Effect Behind Pile Based on Transparent Soil Technology

  • 摘要: 为研究圆桩后土拱效应的特征及演化过程,从细观角度开展了基于透明土技术的桩土相互作用试验研究. 首先开展了透明土配比试验,获取物理力学性质适宜的土体;其次设计了试验系统并得到透明土与桩相互作用的散斑场图像;最后通过particle image velocimetry (PIV)技术分析得到位移矢量图,进一步分析得到透明土位移变化规律. 研究结果表明:通过位移矢量图可以得到圆桩作用下土体运动趋势及土颗粒的位移特征,并可进一步解译得到位移等值线构成的拱形结构,即桩后土拱结构,呈现出抛物线形,其范围与桩径、桩间距及深度有相关性;桩径越大,土拱区域越大,桩径30 mm时,土拱高达100 mm,桩土相互作用的影响范围越大;桩间距越大拱高最大值越大,桩间距80 mm时,土拱高也达100 mm;不同深度下土拱拱高在变化趋势上有较大的相似性,深度越深,土拱的最大拱高越小,深度50 mm时,拱高60 mm;通过拟合公式得到,土拱最大拱高沿桩身方向从桩顶至桩底呈逐渐减小趋势,同时随土体位移增加,表现出先增大,后趋于一稳定值的特征,其稳定值的大小与桩径呈正相关、桩间距呈正相关及深度呈负相关.

     

  • 图 1  熔融石英砂粒径级配曲线

    Figure 1.  Grading curve of fused silica sand particle size

    图 2  试验装置

    Figure 2.  Experimental setup

    图 3  透明土形成的散斑场

    Figure 3.  Speckle field formed by transparent soil

    图 4  不同位移条件下变形矢量图

    Figure 4.  Deformation vector under different displacements

    图 5  位移云图

    Figure 5.  Displacement images

    图 6  土拱桩土作用区域划分

    Figure 6.  Division of soil arch

    图 7  不同桩径及模型箱移动条件下土体位移变化

    Figure 7.  Soil particle displacement changes under different pile diameters and model box moving conditions

    图 8  不同桩径下的拱高对比

    Figure 8.  Comparison of arch elevations with different pile diameters

    图 9  不同桩间距拱高对比

    Figure 9.  Comparison of arch elevations with different pile spacing

    表  1  透明土合成材料折射率

    Table  1.   Refractive index of transparent earth composite

    材料折射率
    熔融石英砂 (SiO2 1.458 3
    正十二烷 (C12H26 1.442 0
    食品级15号白油 1.465 0
    下载: 导出CSV

    表  2  混合液配比表

    Table  2.   Mixed liquid ratios

    正十二烷/ml15号白油/ml体积比混合液折射率
    8 92 1.0∶11.5 1.463 1
    20 80 1.0∶4.0 1.460 5
    24 76 1.0∶3.2 1.459 5
    28 72 1.0∶2.5 1.458 5
    30 70 1.0∶2.3 1.458 0
    下载: 导出CSV

    表  3  不同相对密度下透明土物理参数

    Table  3.   Physical parameters of transparent soil with different relative densities

    相对密度 Dr/%孔隙比干密度/(g•cm−3试样质量/g
    85 0.630 1.381 82.73
    60 0.723 1.312 78.63
    35 0.816 1.238 74.21
    下载: 导出CSV

    表  4  不同桩径试验参数

    Table  4.   Test parameters with different pile diameters mm

    桩径桩间距层面深度桩长
    10 60 10 160
    20 60 10 160
    30 60 10 160
    下载: 导出CSV

    表  5  不同桩间距试验参数

    Table  5.   Test parameters with different pile spacing mm

    桩径桩间距层面深度桩长
    20 40 10 160
    20 60 10 160
    20 80 10 160
    下载: 导出CSV

    表  6  不同深度试验参数

    Table  6.   Test parameters with different depths mm

    桩径桩间距层面深度桩长
    20 60 10 160
    20 60 30 160
    20 60 50 160
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-08-06
  • 修回日期:  2019-10-30
  • 网络出版日期:  2020-04-28
  • 刊出日期:  2020-06-01

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