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

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

罗崇亮^{1, 2,},
余云燕^1, ,,
张璟³,
崔文豪¹,
杜乾中¹,
丁小刚¹

1.
兰州交通大学土木工程学院，甘肃兰州 730070
2.
河西学院土木工程学院，甘肃张掖 734000
3.
中国科学院西北生态环境资源研究院，甘肃兰州 730000

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
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- 被引次数: 0
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

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

1.
School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
2.
School of Civil Engineering, Hexi University, Zhangye 734000, China
3.
Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China

摘要

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.
- 非饱和盐渍土 /
- 单向冻结试验 /
- 传热传质 /
- 耦合模型 /
- 数值模拟
Abstract:
In order to study the heat and mass transfer behavior of saline soil in western cold-arid regions, firstly unsaturated sulfate saline soil experienced unidirectional freezing tests with no pressure recharge. In addition, while the latent heat of crystallization, crystallization impedance and crystallization consumption are considered, a three-field coupling model of water-heat-salt for unsaturated sulfate saline soil is established. Finally, COMSOL Multi-physics is used to simulate the coupling model, the simulation results of which are then compared with the experimental data for analysis. The results show that the internal temperature of saline soils develops in three stages with the freezing time, gradually forming a temperature gradient of cold at the top and warm at the bottom. Driven by both temperature gradient and matrix suction, water and salt migrate to the freezing front position, and the water and salt contents reach peaks at the freezing front position, and compared with the initial values, the peak water content and salt content increase by 2.16% and 0.28%, respectively. The freezing front moves along the frozen temperature line, and forms a freezing front. The maximum freezing depth of soil column is about 15.5 cm.
- unsaturated saline soil /
- unidirectional freezing test /
- heat and mass transfer /
- coupling model /
- numerical simulation

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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

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图 2 溶液补给量变化曲线

Figure 2. Variation curve of solution recharge

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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

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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

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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

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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

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图 7 数值模拟计算程序

Figure 7. Calculation program for numerical simulation

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图 8 温度模拟结果与实测值对比

Figure 8. Comparison of simulated and measured temperature values

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图 9 导热系数空间分布特征

Figure 9. Spatial distribution characteristics of thermal conductivity

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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

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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

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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

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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

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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

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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

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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	G_s	ρ_max/（g·cm⁻³）	ω_opt/%	w_L/%	w_P/%	C_u	C_c
取值	2.70	1.78	13.7	25.35	12.62	5.29	0.59

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表 2 模型参数

Table 2. Model parameters

参数	数值	参数	数值
a₀	2	L_i/（kJ·kg⁻¹）	334.6
m	0.15	L_c/（kJ·kg⁻¹）	210
l	0.5	C_w/（J·（kg·℃） ⁻¹）	4180
ɵ_r	0.002	C_i/（J·（kg·℃）⁻¹）	2090
ɵ_s	0.397	C_c/（J·（kg·℃）⁻¹）	1090
k_s/（m·s⁻¹）	10⁻⁶	C_s/（J·（kg·℃）⁻¹）	850
B	0.61	λ_w/（W·（m·K） ⁻¹）	0.58
ρ_w/（kg·m⁻³）	1000	λ_i/（W·（m·K）⁻¹）	2.22
ρ_i/（kg·m⁻³）	918	λ_c/（W·（m·K）⁻¹）	0.14
ρ_c/（kg·m⁻³）	1460	λ_s/（W·（m·K）⁻¹）	1.50
ρ_s/（kg·m⁻³）	2700	D₀/（m²·h⁻¹）	1.098 × 10⁻⁵
ρ_d/（kg·m⁻³）	1600	a	0.00261
M_w/（g·mol⁻¹）	180	b	10
M_c/（g·mol⁻¹）	322	α/mm	7.021

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