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Research Article

Mechanical properties and energy evolution of jointed rock specimens containing an opening under uniaxial loading

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  • Received: 5 September 2020Revised: 2 December 2020Accepted: 8 December 2020Available online: 12 December 2020
  • For investigating the impact of an opening and joints with different inclination angles on the mechanical response behavior, the energy evolution characteristics and distribution law of granite specimens, uniaxial loading tests were performed on the parallel jointed rock samples with an opening. The results indicate that there is a trend of first decreasing and then increasing of the strength and deformation parameters with the increase of inclination angle, reaching the minimum values when the inclination angle was 45°. The evolution curves of the elastic strain energy and dissipated energy with strain of the samples show the characteristics of step-like gradual mutation. The peak total energy, elastic strain energy, dissipated energy, and total input energy during the failure of the samples showed significant nonlinear characteristics with increasing inclination angle. The opening and joints as well as the change of the inclination angle had significant influences on the proportion of the elastic strain energy of the samples prior to the peak, resulting in the difference of the distribution law of input energy. Moreover, the energy mechanism of the sample failure was discussed, and the energy release was the internal cause of the sudden destruction of the entire rock mass.
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Mechanical properties and energy evolution of jointed rock specimens containing an opening under uniaxial loading

  • Corresponding author:

    Fen-hua Ren    E-mail: renfh_2001@163.com

  • 1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 2. Key Laboratory of High-Efficient Mining and Safety of Metal Mines (Ministry of Education of China), University of Science and Technology Beijing, Beijing 100083, China
  • 3. Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing, Beijing 100083, China

Abstract: For investigating the impact of an opening and joints with different inclination angles on the mechanical response behavior, the energy evolution characteristics and distribution law of granite specimens, uniaxial loading tests were performed on the parallel jointed rock samples with an opening. The results indicate that there is a trend of first decreasing and then increasing of the strength and deformation parameters with the increase of inclination angle, reaching the minimum values when the inclination angle was 45°. The evolution curves of the elastic strain energy and dissipated energy with strain of the samples show the characteristics of step-like gradual mutation. The peak total energy, elastic strain energy, dissipated energy, and total input energy during the failure of the samples showed significant nonlinear characteristics with increasing inclination angle. The opening and joints as well as the change of the inclination angle had significant influences on the proportion of the elastic strain energy of the samples prior to the peak, resulting in the difference of the distribution law of input energy. Moreover, the energy mechanism of the sample failure was discussed, and the energy release was the internal cause of the sudden destruction of the entire rock mass.

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