Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (9): 2347-2359.doi: 10.16285/j.rsm.2021.6920

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Experimental study on influence of positional relationship between dynamic load and long axis on impact rockburst in an elliptical cavern

WANG Yang1, 2, 3, 4, LIU Dong-qiao4, REN Fu-qiang5, HU Tian-xiang4, HE Man-chao4   

  1. 1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China 2. Key Laboratory of Active Tectonics and Geological Safety, Ministry of Natural Resources, Beijing 100081, China 3. Research Center of Neotectonism and Crustal Stability, China Geological Survey, Beijing 100081, China 4. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China 5. School of Civil Engineering, University of Science and Technology Liaoning, Anshan, Liaoning 114051, China
  • Online:2022-10-24 Published:2022-10-31
  • Contact: LIU Dong-qiao, male, born in 1986, PhD, Associate Professor, mainly engaged in teaching and research of rock mechanics theory and engineering. E-mail:
  • About author: WANG Yang, male, born in 1991, PhD, Assistant Professor, research interest: deep rock mechanics.
  • Supported by:
    the National Natural Science Foundation of China(41941018, 52074299), the Fundamental Research Funds for the Central Universities(2021JCCXSB03) and the Fundamental Science Foundation of Institute of Geomechanics (DZLXJK202210).

Abstract: In order to explore the influence of the relative positional relationship between the dynamic load and the long axis of the elliptical cavern on the characteristics of impact rockburst, a cuboid sample with an elliptical hole is prepared. With two positional relationships of disturbance direction parallel or perpendicular to the long axis of the elliptical cavern, the elliptical cavern impact rockburst experiments are carried out. With the aid of video recording device, the characteristics of the impact rockburst of the elliptical cavern are discussed in terms of damage process of rockburst ejection, ejection speed, failure mode and fragment size. The experimental results show that the rockburst processes of the two samples with different positional relationships are the same, and the rockburst pits are all V-shaped. The initial failure stress, rockburst stress, rockburst ejection velocity, rockburst pit size, fragment mass and proportion of coarse-grained fragments of the samples whose disturbance direction is perpendicular to the long axis of the ellipse are smaller than those of the samples whose disturbance direction is parallel to the long axis. The fragment characteristics of the samples whose disturbance direction is perpendicular to the long axis of the ellipse are mainly presented as thin stripes. The samples whose disturbance direction is parallel to the long axis of the ellipse can significantly improve the bearing capacity of the cavern structure. However, the rockburst phenomenon is more severe and its debris characteristics are mainly of thick plate.

Key words: elliptical cavern, long and short axes, impact rockburst, ejection velocity, fragment characteristics