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硫酸盐渍土热-质迁移试验与耦合模型

罗崇亮 余云燕 张璟 崔文豪 杜乾中 丁小刚

罗崇亮, 余云燕, 张璟, 崔文豪, 杜乾中, 丁小刚. 硫酸盐渍土热-质迁移试验与耦合模型[J]. 西南交通大学学报, 2023, 58(2): 470-478. doi: 10.3969/j.issn.0258-2724.20220633
引用本文: 罗崇亮, 余云燕, 张璟, 崔文豪, 杜乾中, 丁小刚. 硫酸盐渍土热-质迁移试验与耦合模型[J]. 西南交通大学学报, 2023, 58(2): 470-478. doi: 10.3969/j.issn.0258-2724.20220633
LUO Chongliang, YU Yunyan, ZHANG Jing, CUI Wenhao, DU Qianzhong, DING Xiaogang. Heat-Mass Transfer Test and Coupling Model of Sulfate Saline Soil[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 470-478. doi: 10.3969/j.issn.0258-2724.20220633
Citation: LUO Chongliang, YU Yunyan, ZHANG Jing, CUI Wenhao, DU Qianzhong, DING Xiaogang. Heat-Mass Transfer Test and Coupling Model of Sulfate Saline Soil[J]. Journal of Southwest Jiaotong University, 2023, 58(2): 470-478. doi: 10.3969/j.issn.0258-2724.20220633

硫酸盐渍土热-质迁移试验与耦合模型

doi: 10.3969/j.issn.0258-2724.20220633
基金项目: 甘肃省科技计划资助(22JR5RA325); 甘肃省优秀研究生“创新之星”资助(2022CXZX-528)
详细信息
    作者简介:

    罗崇亮(1992—),男,博士研究生,研究方向为特殊土工程性质与工程应用,E-mail:18219719756@163.com

    通讯作者:

    余云燕(1968—),女,教授,博士生导师,研究方向为岩土与地下工程、土-结构耦合动力学,E-mail:yuyunyan@mail.lzjtu.cn

  • 中图分类号: TU445

Heat-Mass Transfer Test and Coupling Model of Sulfate Saline Soil

  • 摘要:

    为研究西部寒旱区盐渍土传热传质行为,首先,在无压补给条件下进行非饱和硫酸盐渍土的单向冻结试验;其次,考虑结晶潜热、结晶阻抗及结晶消耗等因素,建立非饱和硫酸盐渍土水-热-盐三场耦合模型;最后,采用COMSOL Multi-physics对耦合模型进行数值模拟,将模拟结果与试验数据进行对比分析. 研究结果表明:盐渍土内温度随冻结时长呈三阶段发展,逐步形成上冷下暖的温度梯度;在温度梯度和基质吸力双重驱动下,水、盐向冻结锋位置迁移,冻结锋位置水、盐含量出现峰值,峰值含水率、含盐量相较初始值分别增加2.16%和0.28%;冻结锋沿冻结温度线移动,形成冻结锋面;土柱最大冻结深度约为15.5 cm.

     

  • 图 1  设备装置

    a.冷浴;b.温控箱;c.数据采集仪;d.计算机系统;e.水盐传感器;f.位移计;g.温度传感器;h.马氏瓶无压补给系统;i.盐渍土.

    Figure 1.  Equipment installation

    图 2  溶液补给量变化曲线

    Figure 2.  Variation curve of solution recharge

    图 3  盐渍土柱不同位置温度时程曲线

    Figure 3.  Temperature-time history curves of saline soil samples at different locations

    图 4  不同时刻盐渍土柱等温线分布

    Figure 4.  Isotherm distribution of saline soil columns at different moments

    图 5  冻结96 h土柱含水率分布状况

    Figure 5.  Water content distribution of soil column frozen for 96 h

    图 6  冻结96 h土柱含盐量分布状况

    Figure 6.  Salinity distribution in soil columns frozen for 96 h

    图 7  数值模拟计算程序

    Figure 7.  Calculation program for numerical simulation

    图 8  温度模拟结果与实测值对比

    Figure 8.  Comparison of simulated and measured temperature values

    图 9  导热系数空间分布特征

    Figure 9.  Spatial distribution characteristics of thermal conductivity

    图 10  不同时刻样品模型中温度分布云图

    Figure 10.  Nephogram of temperature distribution in samples at different times

    图 11  土柱液态水含量模拟结果与实测值对比

    Figure 11.  Comparison of simulation and measured liquid water contents in soil columns

    图 12  不同时刻样品中结晶冰含量分布特征

    Figure 12.  Distribution characteristics of crystalline ice content in samples at different moments

    图 13  盐渍土柱不同高度位置浓度时程曲线

    Figure 13.  Time history curves of concentration at different heights of saline soil column

    图 14  不同时刻样品含盐量分布云图

    Figure 14.  Nephogram of salt content distribution of samples at different moments

    图 15  冻结速率和冻结深度时程曲线

    Figure 15.  Time history curves of freezing rate and freezing depth

    表  1  脱盐后土壤物理力学指标

    Table  1.   Physical and mechanical indexes of soil samples after desalination

    参数Gsρmax/(g·cm−3ωopt/%wL/%wP/%CuCc
    取值2.701.7813.725.3512.625.290.59
    下载: 导出CSV

    表  2  模型参数

    Table  2.   Model parameters

    参数数值参数数值
    a02Li/(kJ·kg−1334.6
    m0.15Lc/(kJ·kg−1210
    l0.5Cw/(J·(kg·℃) −14180
    ɵr0.002Ci/(J·(kg·℃) −12090
    ɵs0.397Cc/(J·(kg·℃) −11090
    ks/(m·s−110−6Cs/(J·(kg·℃) −1850
    B0.61λw/(W·(m·K) −10.58
    ρw/(kg·m−31000λi/(W·(m·K) −12.22
    ρi/(kg·m−3918λc/(W·(m·K) −10.14
    ρc/(kg·m−31460λs/(W·(m·K) −11.50
    ρs/(kg·m−32700D0/(m2·h−11.098 × 10−5
    ρd/(kg·m−31600a0.00261
    Mw/(g·mol−1180b10
    Mc/(g·mol−1322α/mm7.021
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-09-17
  • 修回日期:  2022-11-18
  • 网络出版日期:  2023-03-06
  • 刊出日期:  2022-12-01

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