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层状黏性土中静压桩贯入特性颗粒流的数值模拟

王永洪 桑松魁 刘雪颖 张明义 白晓宇

王永洪, 桑松魁, 刘雪颖, 张明义, 白晓宇. 层状黏性土中静压桩贯入特性颗粒流的数值模拟[J]. 西南交通大学学报, 2021, 56(6): 1250-1259. doi: 10.3969/j.issn.0258-2724.20200072
引用本文: 王永洪, 桑松魁, 刘雪颖, 张明义, 白晓宇. 层状黏性土中静压桩贯入特性颗粒流的数值模拟[J]. 西南交通大学学报, 2021, 56(6): 1250-1259. doi: 10.3969/j.issn.0258-2724.20200072
WANG Yonghong, SANG Songkui, LIU Xueying, ZHANG Mingyi, BAI Xiaoyu. Numerical Simulation of Particle Flow Characteristics of Jacked Pile Penetration in Laminated Clay Soil[J]. Journal of Southwest Jiaotong University, 2021, 56(6): 1250-1259. doi: 10.3969/j.issn.0258-2724.20200072
Citation: WANG Yonghong, SANG Songkui, LIU Xueying, ZHANG Mingyi, BAI Xiaoyu. Numerical Simulation of Particle Flow Characteristics of Jacked Pile Penetration in Laminated Clay Soil[J]. Journal of Southwest Jiaotong University, 2021, 56(6): 1250-1259. doi: 10.3969/j.issn.0258-2724.20200072

层状黏性土中静压桩贯入特性颗粒流的数值模拟

doi: 10.3969/j.issn.0258-2724.20200072
基金项目: 国家自然科学基金(51778312);山东省重点研发计划(2018GSF117010)
详细信息
    作者简介:

    王永洪(1984—),男,讲师,博士,研究方向为地基基础及桩基础,E-mail:hong7986@163.com

  • 中图分类号: TU473

Numerical Simulation of Particle Flow Characteristics of Jacked Pile Penetration in Laminated Clay Soil

  • 摘要:

    为深入探讨层状黏性土中静压桩的贯入机制,结合离散元PFC2D软件在处理大变形、非线性等问题的优势,考虑到接触黏结模型对模拟土体的优越性,建立了静压桩贯入层状黏土中的离散元模型,实现了离散元中静压桩的贯入过程;探讨了静压桩贯入过程中压桩力、桩端阻力、桩侧摩阻力以及桩侧径向压力随贯入深度的变化规律,从细观层次上分析了不同桩径的静压桩贯入层状土中土体接触力链的分布特征,明确了沉桩过程中土体位移的变化规律. 试验结果表明:随着桩径的增大,土层的变化对压桩力的影响逐渐减小;桩侧摩阻力和桩侧径向土压力的变化规律相似,在同一贯入深度处均出现明显的退化现象;不同土层接触力链的表现形式不同,桩端位于粉质黏土层时,桩端的影响范围约为7DD为桩径),桩端位于粉土层时,桩端的影响范围约为9D;粉质黏土中土颗粒主要以径向位移为主,而在粉土层中土颗粒位移受其上下土层的软硬程度制约.

     

  • 图 1  生成土样

    Figure 1.  Generated soil sample

    图 2  桩体的组成

    Figure 2.  Composition of pile body

    图 3  压桩力对比分析曲线

    Figure 3.  Comparative analysis curves of pile pressure

    图 4  不同桩径下附带土颗粒形式

    Figure 4.  Soil particle forms under different pile diameters

    图 5  桩端阻力对比分析曲线

    Figure 5.  Comparative analysis curves of pile resistance

    图 6  径向土压力随贯入深度变化曲线

    Figure 6.  Curves of radial earth pressure changing with penetration depth

    图 7  沉桩过程

    Figure 7.  Pile penetration process

    图 8  侧摩阻力随贯入深度的变化曲线

    Figure 8.  Curves of lateral friction changing with penetration depth

    图 9  Meyerhof桩端土的滑动面

    Figure 9.  Sliding surface of soil at Meyerhof pile end

    图 10  不同桩径下力链变化

    Figure 10.  Force chain changes with different pile diameters

    图 11  贯入不同深度时力链变化图

    Figure 11.  Force chain changes at different penetration depths

    图 12  桩周土变化

    Figure 12.  Soil changes around pile

    图 13  不同土层位移

    Figure 13.  Displacement of different soil layers

    表  1  土层细观参数

    Table  1.   Soil microscopic parameters

    土层土层名称土层厚度/
    cm
    密度/
    (kg•m−3
    法向接触刚度/
    (×107 N•m−1
    切向接触刚度/
    (×107 N•m−1
    法向黏结强度/N切向黏结强度/N摩擦系数
    1回填土(深黄色)52720115002500.270
    2粉土(深红色)52710555002500.756
    3粉质黏土(深蓝色)527201110005000.320
    4粉质黏土(深棕色)527201110005000.460
    5粉土(深灰色)52710555002500.790
    6粉质黏土(绿色)527201110005000.502
    7粉土(黑色)52710555002500.780
    8~12砂土(橙色、紫色、青色、浅灰色、浅黄色)25265080800.500
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  • 收稿日期:  2020-03-05
  • 修回日期:  2020-06-29
  • 网络出版日期:  2020-07-07
  • 刊出日期:  2020-07-07

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