A distributed measurement method for in-situ soil moisture content by using carbon-fiber heated cable

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• 作者：Dingfeng Cao^aAuthor Vitae ; Bin Shi^a ; ^{shibin@nju.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Honghu Zhu^a ; ^{zhh@nju.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Guangqing Wei^b ; Shen-En Chen^c ; Junfan Yan^a
• 关键词：In-situ soil moisture content ; Distributed measurement ; Carbon-fiber heated cable (CFHC) ; Fiber-optic sensing
• 刊名：Journal of Rock Mechanics and Geotechnical Engineering
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：7
• 期：6
• 页码：700-707
• 全文大小：1944 K

文摘

Moisture content is a fundamental physical index that quantifies soil property and is closely associated with the hydrological, ecological and engineering behaviors of soil. To measure in-situ soil moisture contents, a distributed measurement system for in-situ soil moisture content (SM-DTS) is introduced. The system is based on carbon-fiber heated cable (CFHC) technology that has been developed to enhance the measuring accuracy of in-situ soil moisture content. Using CFHC technique, a temperature characteristic value (T_t) can be defined from temperature–time curves. A relationship among T_t, soil thermal impedance coefficient and soil moisture content is then established in laboratory. The feasibility of the SM-DTS technology to provide distributed measurements of in-situ soil moisture content is verified through field tests. The research reported herein indicates that the proposed SM-DTS is capable of measuring in-situ soil moisture content over long distances and large areas.