Geomechanics and Engineering

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Interaction and mechanical effect of materials interface of contact zone composite samples: Uniaxial compression experimental and numerical studies

  • Wang, Weiqi (School of Resources and Environmental Engineering, Wuhan University of Science and Technology) ;
  • Ye, Yicheng (School of Resources and Environmental Engineering, Wuhan University of Science and Technology) ;
  • Wang, Qihu (School of Resources and Environmental Engineering, Wuhan University of Science and Technology) ;
  • Luo, Binyu (School of Resources and Environmental Engineering, Wuhan University of Science and Technology) ;
  • Wang, Jie (School of Resources and Environmental Engineering, Wuhan University of Science and Technology) ;
  • Liu, Yang (School of Resources and Environmental Engineering, Wuhan University of Science and Technology)
  • Received : 2019.09.25
  • Accepted : 2020.05.18
  • Published : 2020.06.25
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Abstract

Aiming at the mechanical and structural characteristics of the contact zone composite rock, the uniaxial compression tests and numerical studies were carried out. The interaction forms and formation mechanisms at the contact interfaces of different materials were analyzed to reveal the effect of interaction on the mechanical behavior of composite samples. The research demonstrated that there are three types of interactions between the two materials at the contact interface: constraint parallel to the interface, squeezing perpendicular to the interface, and shear stress on the interface. The interaction is mainly affected by the differences in Poisson's ratio and elastic modulus of the two materials, stronger interface adhesion, and larger interface inclination. The interaction weakens the strength and stiffness of the composite sample, and the magnitude of weakening is positively correlated with the degree of difference in the mechanical properties of the materials. The tensile-shear stress derived from the interaction results in the axial tensile fracture perpendicular to the interface and the interfacial shear facture. Tensile cracks in stronger material will propagation into the weaker material through the bonded interface. The larger inclination angle of the interface enhances the effect of composite tensile/shear failure on the overall sample.

Keywords

Acknowledgement

The authors acknowledge the financial support from the National Natural Science Foundation of China (Nos. 51704213 and 51574183), the Special Project of Central Government for Local Science and Technology Development of Hubei Province (2019ZYYD060) and the Open Fund of Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources in 2019 (No. 2019zy002).

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