基于介电理论的红黏土水分特征曲线评价模型研究

  • 王海军 ,
  • 徐兴倩 ,
  • 李丞 ,
  • 赵熹 ,
  • 马关宇 ,
  • 马方雯
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  • 1.云南农业大学 水利学院 昆明 650201;
    2.中国科学院、水利部成都山地灾害与环境研究所 成都 610299;
    3.中国科学院大学 北京 100049;
    4.凯里学院 贵州 凯里 556099;
    5.中国地质调查局昆明自然资源综合调查中心 昆明 650051
王海军(1996—),男,四川汉源人,博士研究生,主要从事岩土工程研究。E-mail:wanghaijun_6@163.com

修回日期: 2025-02-24

  录用日期: 2025-05-14

  网络出版日期: 2025-07-11

基金资助

国家自然科学基金项目(42367025,42307269); 云南省基础研究计划农业联合专项(202301BD070001-171); 云南省高层次人才培养支持计划“青年拔尖人才”专项(YNWR-QNBJ-2020-030)

Study on Evaluation Model of Laterite Water Characteristic Curve Based on Dielectric Theory

  • WANG Hai-jun ,
  • XU Xing-qian ,
  • LI Cheng ,
  • ZHAO Xi ,
  • MA Guan-yu ,
  • MA Fang-wen
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  • 1. College of Water Conservancy, Yunnan Agricultural University, Kunming 650201, China;
    2. Chengdu Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu 610299, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China;
    4. Kaili College, Guizhou Kaili 556099, China;
    5. Kunming General Survey of Natural Resource Center, China Geological Survey, Kunming 650051,China

Revised date: 2025-02-24

  Accepted date: 2025-05-14

  Online published: 2025-07-11

摘要

土体的水分特征曲线(SWCC)有效反映了土中水吸力(基质势)与水分含量的关系,但传统测试方法难以适用于原位水动力参数的标定。为探寻更便捷、经济和可靠的原位测试手段,推导提出了土体等效介电常数-基质吸力特征曲线(SEDCC)评价模型。本文通过重塑云南省6个地区红黏土的平均干密度(1.2g/cm3)进行模型验证,系统分析了红黏土SEDCC曲线的预测精度,并深入探讨了电磁波介电理论参数间接评价红黏土水分特征曲线的可行性。结果表明:不同地区红黏土水分特征曲线满足Fredlund模型关系,拟合精度具有地区性差异;不同地区红黏土等效介电常数与基质吸力的拟合精度均大于95%,且基质吸力理论反演曲线与介电理论预测曲线之间有较好的对称性;对比分析红黏土水分特征曲线计算值与实测值,发现两者变化趋势较为接近,平均相对误差为6.42%。因此,该模型应用于红黏土水分特征曲线评价具有较大潜力,可为拓展电磁波技术快速评价土体水力学特性研究提供理论模型参考。

本文引用格式

王海军 , 徐兴倩 , 李丞 , 赵熹 , 马关宇 , 马方雯 . 基于介电理论的红黏土水分特征曲线评价模型研究[J]. 长江科学院院报, 0 : 20250139 -20250139 . DOI: 10.11988/ckyyb.20250139

Abstract

The soil water characteristic curve ( SWCC ) effectively characterizes the relationship between matrix potential and water content, yet conventional testing methods present challenges for in-situ hydrodynamic parameter calibration. In order to explore a more convenient, economical and reliable in-situ test method, an evaluation model of soil equivalent dielectric constant-matrix suction characteristic curve ( SEDCC ) is proposed. In this paper, the average dry density ( 1.2g/cm3 ) of laterite in six regions of Yunnan Province was remodeled to verify the model. The prediction accuracy of SEDCC curve of laterite was systematically analyzed, and the feasibility of indirect evaluation of water characteristic curve of laterite by electromagnetic wave dielectric theory parameters is discussed. The results show that the water characteristic curve of laterite in different regions meets the Fredlund model relationship, and the fitting accuracy has regional differences. The fitting accuracy of equivalent dielectric constant and matric suction of laterite in different regions is greater than 95%, and there is a good symmetry between the theoretical inversion curve of matric suction and the prediction curve of dielectric theory. By comparing and analyzing the calculated value and measured value of the water characteristic curve of laterite, it is found that the change trend of the two is close, and the average relative error is 6.42%. Therefore, the model has great potential to be applied to the evaluation of the water characteristic curve of laterite, which can provide a theoretical model reference for the rapid evaluation of soil hydraulic characteristics by electromagnetic wave technology.

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