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

Authors

Yang WANG, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China
Dong-qiao LIU, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, ChinaFollow
Fu-qiang REN, School of Civil Engineering, University of Science and Technology Liaoning, Anshan, Liaoning 114051, China
Tian-xiang HU, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China
Man-chao HE, State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China

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.

Graphic Abstract

Recommended Citation

WANG, Yang; LIU, Dong-qiao; REN, Fu-qiang; HU, Tian-xiang; and HE, Man-chao (2022) "Experimental study on influence of positional relationship between dynamic load and long axis on impact rockburst in an elliptical cavern," Rock and Soil Mechanics: Vol. 43: Iss. 9, Article 1.
DOI: 10.16285/j.rsm.2021.6920
Available at: https://rocksoilmech.researchcommons.org/journal/vol43/iss9/1