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Curing time effect on mesocosmic parameters of cemented paste backfill through particle flow code technique

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  • Available online: 11 February 2020
  • Several special mechanical properties such as the dilatancy and compressibility of cemented paste backfilll (CPB) are controlled by the internal microstructure and its evolution. To explore the mesocosmic structure changes of CPB during the development process. Based on the scanning electron microscopy (SEM) and mechanical test results of CPB, the particle size information of CPB was extracted, and a two-dimensional (2D) particle flow code (PFC) model of CPB was established to study the evolution rule of mesoscopic parameters during CPB development. The FISH language of the PFC was used to develop a program for establishing a PFC model according to SEM results. The mesoscopic parameters of CPB samples at different curing times, such as the coordination number (Cn), contact force chain, and rose diagram were obtained by recording and loading; these were used to analyze the intrinsic relationship between mesoscopic parameter variations and macroscopic mechanical response during CPB development. It is of great significance to establish the physical model of CPB by using PFC to reveal the mesoscopic structure of CPB.
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  • This research was supported by the National Natural Science Foundation of China (No. 51504182, 51674188, 51404191, 51405381), the Natural Science Basic Research Plan of Shaanxi Province of China (No. 2015JQ5187, 2018JQ5183, 2018JM5161), the Scientific Research Program funded by the Shaanxi Provincial Education Department (No. 15JK1466), the Project funded by China Postdoctoral Science Foundation (No. 2015M582685), and Outstanding Youth Science Fund of Xi’an University of Science and Technology (No. 2018YQ2-01). This research was also supported by the National Research Council of Science & Technology (NST) grant by the Korea government (MSIP) (No. CRC-16-38502-KICT).

     

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Curing time effect on mesocosmic parameters of cemented paste backfill through particle flow code technique

  • Corresponding author:

    Lang Liu    E-mail: liulang@xust.edu.cn

  • 1) Energy School, Xi'an University of Science and Technology, Xi'an 710054, China
  • 2) Key Laboratory of Western Mines and Hazards Prevention, Ministry of Education of China, Xi'an 710054, China
  • 3) School of Highway, Chang'an University, Xi'an 710064, China
  • 4) Beijing General Research Institute of Mining & Metallurgy, Beijing 100160, China
  • 5) Dept. of Civil Engineering, Inha University, Incheon 402-751, South Korea

Abstract: Several special mechanical properties such as the dilatancy and compressibility of cemented paste backfilll (CPB) are controlled by the internal microstructure and its evolution. To explore the mesocosmic structure changes of CPB during the development process. Based on the scanning electron microscopy (SEM) and mechanical test results of CPB, the particle size information of CPB was extracted, and a two-dimensional (2D) particle flow code (PFC) model of CPB was established to study the evolution rule of mesoscopic parameters during CPB development. The FISH language of the PFC was used to develop a program for establishing a PFC model according to SEM results. The mesoscopic parameters of CPB samples at different curing times, such as the coordination number (Cn), contact force chain, and rose diagram were obtained by recording and loading; these were used to analyze the intrinsic relationship between mesoscopic parameter variations and macroscopic mechanical response during CPB development. It is of great significance to establish the physical model of CPB by using PFC to reveal the mesoscopic structure of CPB.

Acknowledgements  This research was supported by the National Natural Science Foundation of China (No. 51504182, 51674188, 51404191, 51405381), the Natural Science Basic Research Plan of Shaanxi Province of China (No. 2015JQ5187, 2018JQ5183, 2018JM5161), the Scientific Research Program funded by the Shaanxi Provincial Education Department (No. 15JK1466), the Project funded by China Postdoctoral Science Foundation (No. 2015M582685), and Outstanding Youth Science Fund of Xi’an University of Science and Technology (No. 2018YQ2-01). This research was also supported by the National Research Council of Science & Technology (NST) grant by the Korea government (MSIP) (No. CRC-16-38502-KICT).
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