摘要
基于碳纤维加热光缆的分布式测温系统(简称C-DTS),提出了一种土壤含水率分布式测定方法。该方法采用C-DTS测试系统,对埋设在土壤中的碳纤维加热光缆的温度变化进行测定,利用其升温过程中的温度特征值与含水率之间的关系进行分布式测定土壤中的含水率。定义了温度特征值Tt,通过试验证明了Tt与含水率w之间存在线性关系,相关参数可通过标定试验确定。试验结果表明:采用碳纤维光缆人为加热的方法,可有效地测定土壤含水率;而DTS技术的应用,可实现土壤含水率分布式测量;此方法的测量精度与温度特征值的选取有关。
Based on the carbon-fiber-heating-cable distributed temperature sensing system (C-DTS), a new distributed method for measuring the moisture content of soils is proposed. The temperature of soil-buried-cable is measured by C-DTS in this method. The moisture content of soils is determined by the relationship between the temperature characteristic value (Tt) and the moisture content. Tt is defined, and it is proved that there is a linear relationship between the moisture content and Tt. The relevant parameters can be determined by calibration experiment. The experimental results show that the moisture content of soils can be measured effectively through artificial heating carbon-fiber-cable, and the usage of DTS provides distributed measurement. The accuracy of this method is related to the section of Tt. The success of the proposed method provides a very advanced distributed approach for measuring the moisture content of soils. Further improvement and popularization are required.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2014年第5期910-915,共6页
Chinese Journal of Geotechnical Engineering
基金
国家科技支撑计划项目(2012BAK10B05)
国家自然科学基金重点项目(41230636)
国家重点基础研究发展计划(973计划)项目(2011CB710605)
关键词
土壤
含水率
DTS
碳纤维加热光缆
分布式监测
soil
moisture content
DTS
carbon fiber heating optical cable
distributed sensing
