Structural Engineering and Mechanics

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Study on shear fracture behavior of soft filling in concrete specimens: Experimental tests and numerical simulation

  • Lei, Zhou (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University) ;
  • Vahab, Sarfarazi (Department of Mining Engineering, Hamedan University of Technology) ;
  • Hadi, Haeri (Department of Mining Engineering, Higher Education Complex of Zarand) ;
  • Amir Aslan, Naderi (Department of Mining Engineering, Hamedan University of Technology) ;
  • Mohammad Fatehi, Marji (Department of Mining Engineering, Yazd University) ;
  • Fei, Wu (State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University)
  • Received : 2022.09.16
  • Accepted : 2022.12.30
  • Published : 2023.02.10
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Abstract

In this paper, the shear behavior of soft filling in rectangular-hollow concrete specimens was simulated using the 2D particle flow code (PFC2D). The laboratory-measured properties were used to calibrate some PFC2D micro-properties for modeling the behavior of geo-materials. The dimensions of prepared and modeled samples were 100 mm×100 mm. Some disc type narrow bands were removed from the central part of the model and different lengths of bridge areas (i.e., the distance between internal tips of two joints) with lengths of 30 mm, 50 mm, and 70 mm were produced. Then, the middle of the rectangular hollow was filled with cement material. Three filling sizes with dimensions of 5 mm×5 mm, 10 mm×5 mm, and 15 mm×5 mm were provided for different modeled samples. The parallel bond model was used to calibrate and re-produce these modeled specimens. Therefore, totally, 9 different types of samples were designed for the shear tests in PFC2D. The shear load was gradually applied to the model under a constant loading condition of 3 MPa (σc/3). The loading was continued till shear failure occur in the modeled concrete specimens. It has been shown that both tensile and shear cracks may occur in the fillings. The shear cracks mainly initiated from the crack (joint) tips and coalesced with another one. The shear displacements and shear strengths were both increased as the filling dimensions increased (for the case of a bridge area with a particular fixed length).

Keywords

Acknowledgement

This work was financially supported by the Science and Technology Department of Sichuan Province (2023YFH0022), the National Natural Science Foundation of China (52204104), the Open Project of State Key Laboratory of Coal Mine Disaster Dynamics and Control (2011DA105287-FW201905), the Open Fund of Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province (20kfgk01), the Opening Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology (SKLGP2021K009), the Sichuan University postdoctoral interdisciplinary Innovation Fund.

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