土的介电常数模型及其工程运用探讨

廖红建; 孙俊煜; 昝月稳; 朱庆女; 顾飞

doi:10.11779/CJGE2016S2006

土的介电常数模型及其工程运用探讨 English Version

1. 西安交通大学人居环境与建筑工程学院,陕西西安 710049;
2. 西南交通大学地球科学与环境工程学院,四川成都 610031

基金项目: 国家自然科学基金项目（51279155,41172276）

详细信息

作者简介:
廖红建(1962- ),女,博士,教授,博士生导师,研究方向为岩土工程数值分析。E-mail: hjliao@mail.xjtu.edu.cn。

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出版历程
- 收稿日期: 2016-05-18
- 发布日期: 2016-10-19

Dielectric constant model for soil and its application in engineering

1. School of Human Settlement and Civil Engineering, Xi’an Jiaotong University, Xi'an 710049, China;
2. School of Geosciences and Environment Engineering, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 土的介电常数模型反映了介电常数和体积含水率之间的关系,建立合理的介电常数模型,通过探地雷达技术测定介电常数就可以预测土的含水状态。而土的含水率与其工程物理特性密切相关,土的液塑限是划分土体工程状态的重要指标。因此,探讨不同土体的介电常数与含水率的关系,根据介电常数来直接判断土的软硬状态,可为岩土工程设计提供方便途径。通过一系列不同含水率的土体的介电常数室内试验,针对不同含砂量的黄土,系统分析和探讨体积含水率和介电常数之间的关系。结合黄土的工程特性,对Topp经验模型、扩散模型、体积混合模型,以及根据电磁场理论推导的多项介质混合模型等介电常数模型进行适用性分析。通过试验结果分析,建立了物理意义明确简化的土体介电常数模型,提出了依据土体介电常数对含水率变化的敏感程度系数来划分土体类别的建议,并通过试验进行了验证,表明结果相符。进一步根据试验结果,深入研究含水状态对土体工程特性的影响,分析并给出黄土的液塑限对应的介电常数,通过建立液性指数与介电常数的关系式,提出了依据介电常数来划分的黄土软硬状态评价指标的建议值。
- 黄土 /
- 含砂量 /
- 介电常数 /
- 体积含水率
Abstract: The dielectric constant model is the relationship between dielectric constant and volumetric water content. Using proper model, the water content can be predicted by the dielectric constant from GPR. The water content of soil is closely related to its physical properties in engineering. The engineering status of soil can be classified by its liquid limit and plastic limit. Therefore, the engineering status of soil may be judged by the dielectric constant directly based on the study on different soils, which can make geotechnical design be easier. The relationship between dielectric constant and volumetric water content is discussed based on a series of loess samples with different sand contents. The applicability of several models is analyzed according to the engineering properties of loess. Moreover, a dielectric constant model, which has clear meaning and concise form, is put forward. It is suggested that the soil should be classified according to the index of sensitive rate of dielectric constant to change of moisture. The results agree with the experimental data. Furthermore, the dielectric constant of loess at liquid limit and plastic limit and the expression for liquidity index and dielectric constant are given. The method to evaluate the engineering status of soil is proposed according to the dielectric constant.
- loess /
- sand content /
- dielectric constant /
- volumetric water content

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参考文献(14)

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