Abstract
The time domain reflectometry (TDR) method has been widely used to explore and track soil moisture. It is necessary to research mini-probes for reducing the influence of the transducer on soil measurement, which encountered many challenges, especially as the transducers are used for studying small-scaled laboratory tests of stiff clay. To overcome these problems, three-wire mini-probes were developed and applied in the present work. Initially, a two-dimensional (2D) weighting theory and numerical simulations were adopted to preliminarily determine the rod spacing (4–4.5 mm) and diameter (0.47–0.63 mm). Subsequently, needle and drill mini-probes were designed to conduct experimental calibration. It was reasonable to employ a 3 cm probe for measurement and a linear equation that related Ka1/2 with θ was obtained. Finally, mini-probes were applied to measure water content of compacted and intact stiff clay specimens during continuous desiccation and intact Téguline clay column during wetting, indicating that the mini-probes have the acceptable workability for measuring the moisture of compacted/intact stiff clay undergoing desiccation or wetting processes.
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Acknowledgements
The research described in this paper was financially supported by the Natural Science Foundation of China (Grant No. 41907239, 42177138 and 51878159) and the Project funded by China Postdoctoral Science Foundation (2020M680909) and the European Commission of the Marie Skłodowska-Curie Actions HERCULES—Towards Geo-Hazards Resilient Infrastructure under Changing Climates (H2020-MSCA-RISE-2017, 778360).
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Qin, P., Deng, Y., Cui, Y. et al. Development and Application of TDR Mini-Probes for Monitoring Moisture in Small-Scale Laboratory Tests. Int J Civ Eng 21, 905–914 (2023). https://doi.org/10.1007/s40999-022-00772-7
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DOI: https://doi.org/10.1007/s40999-022-00772-7