Numerical Simulation Study of Catastrophe Process for Structural

Numerical Simulation Study of Catastrophe Process for Structural–Slip Rockburst

Guo, Jiaqi / Zhang, Hengyuan / Sun, Feiyue / Shi, Xiaoyan / Zhu, Binzhong / Guo, Peng

Abstract Structural–slip rockburst induced by structural plane slip are more strongly destructive than strain rockburst and pose a significant threat to the construction safety of deeply buried tunnels traversing faulted sections. In this paper, the three dimensional discrete element method and virtual joint technology are used to systematically study the structural–slip rockburst development process when the tunnel approaches and crosses a large structural plane. The visualization of energy and rockburst proneness is realized, and revealing the evolution law of multi-information such as displacement field, stress field, and rockburst proneness during the structural–slip rockburst. The results indicate that: the displacement of the surrounding rock near the tunnel profile gradually increases before and during the tunnel crossing large structural plane, and remains unchanged after the crossing process; the ejection of relatively large rock masses appears at the tunnel vault when the structural plane is being approached, and in the process of exposing the structural plane, many fissures and ejections of rock masses mixed with debris appear at the side walls first, followed by the surrounding rock slab at the spandrel cracked to form a thin rock slab and fell, in away from the structural plane, the arch bottom and side walls appear relatively more rock block ejection; before the tunnel reaches the structural plane the surrounding rock rockburst proneness gradually increased, during crossing the structural plane the rockburst proneness reached maximum, while away from the structural plane the rockburst proneness gradually decreased.