Acknowledgement
This work was supported by the Open Research Fund of the State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences (Grant No. Z018019), the State Key Laboratory of Subtropical Building Science, South China University of Technology (Grant No. 2017KB16), and the National Key Scientific Instruments and Equipment Development Projects of China (Grant No. 41827807).
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