Geomechanics and Engineering

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Effects of interface angles on properties of rock-cemented coal gangue-fly ash backfill bi-materials

  • Yin, Da W. (State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology) ;
  • Chen, Shao J. (State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology) ;
  • Sun, Xi Z. (College of Civil Engineering and Architecture, Linyi University) ;
  • Jiang, Ning (State Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technology)
  • Received : 2020.08.25
  • Accepted : 2020.12.28
  • Published : 2021.01.10
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Abstract

Uniaxial compression tests were conducted on sandstone-CGFB composite samples with different interface angles, and their strength, acoustic emission (AE), and failure characteristics were investigated. Three macro-failure patterns were identified: the splitting failure accompanied by local spalling failure in CGFB (Type-I), the mixed failure with small sliding failure along with the interface and Type-I failure (Type-II), and the sliding failure along with the interface (Type-III). With an increase of interface angle β measured horizontally, the macro-failure pattern changed from Type-I to Type-II, and then to Type-III, and the uniaxial compressive strength and elastic modulus generally decreased. Due to the small sliding failure along with the interface in the composite sample with β of 45°, AE events underwent fluctuations in peak values at the later post-peak failure stage. The composite samples with β of 60° occurred Type-III failure before the completion of initial compaction stage, and the post-peak stress-time curve initially exhibited a slow decrease, followed by a steep linear drop with peaks in AE events.

Keywords

Acknowledgement

This work was supported by the National Key R&D Programme [grant number 2018YFC0604704], National Natural Science Foundation of China [grant numbers. 51904167, 52074169, 52004146; 51904149], Taishan Scholars Project, Taishan Scholar Talent Team Support Plan for Advantaged & Unique Discipline Areas, SDUST Research Fund, Open Research Fund of Key Laboratory of Safety and High-efficiency Coal Mining [grant number JYBSYS2019201], and Natural Science Foundation of Shandong Province [grant number 2019BEE013].

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