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Volume 40 Issue 3
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LI Jian, WANG Yong, KONG Ling-wei, WANG Ming-yuan, CHENG Peng, MA Yong-zheng. Development and preliminary application of a new temperature-controlled triaxial test system for unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(3): 468-474. DOI: 10.11779/CJGE201803010
Citation: LI Jian, WANG Yong, KONG Ling-wei, WANG Ming-yuan, CHENG Peng, MA Yong-zheng. Development and preliminary application of a new temperature-controlled triaxial test system for unsaturated soils[J]. Chinese Journal of Geotechnical Engineering, 2018, 40(3): 468-474. DOI: 10.11779/CJGE201803010
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Development and preliminary application of a new temperature-controlled triaxial test system for unsaturated soils

  • 1. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China;
    2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;
    3. Power China Huadong Engineering Corporation Ltd., Hangzhou 310012, China;
    4. Ningbo University of Technology, Ningbo 315016, China

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  • Received Date: June 10, 2017
  • Published Date: March 24, 2018
    Graphical Abstract
    • Abstract
  • In order to study the influence of temperature on the hydraulic, mechanical and acoustic properties of unsaturated soils, a temperature-controlled triaxial apparatus with the bender element system (BES) and precision volume change measurement is developed. The instrument can accurately control and measure temperatures by adding a temperature-controlled inner pressure chamber into the stress path unsaturated triaxial testing system of geotechnical digital systems. A differential pressure sensor and the temperature-controlled inner pressure chamber are combined to achieve the precision measurement of volume change of specimens under different temperatures, whilst the BES is equipped to perform the real-time wave velocity tests. A series of experiments are carried out on the sand in Hangzhou Bay, including the triaxial shear tests under four temperature levels and the wave velocity tests under the same temperature level. The results show that the new instrument can control the temperature stably and accurately measure the volume change and the real-time wave velocity of the specimens under different temperatures. The performance of the instrument is satisfactory. Additionally, the instrument has the advantages of simple integral structure, convenient assembly and disassembly, and the function to perform freely the switching tests between the conventional and the temperature-controlled for unsaturated (saturated) soils without mutual interference. The successful development of the instrument will provide a convenient and effective testing device for the study on the hydro-hydraulic-mechanical-acoustic coupling characteristics of unsaturated (saturated) soils.
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    • References (21)
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