基于三维离散元的岩爆突变点处动力行为与能量演化研究

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中图分类号：TU457 文献标志码：A 文章编号：2096-6717（2025）03-0102-11

Dynamic behavior and energy evolution at rockburst mutation momentbasedon DEM

WEI Ruia， ZHAO Chengab，QIAN Yuana （a.College ofCivil Engineering;b.KeyLaboratoryofGeotechnical and Underground EngineeringofMinistryof Education，Tongji University，Shanghai 2Ooo92，P.R.China）

Abstract：The dynamic behavior and energy evolution of rockburst at the moment of sudden instabilityare the key to reveal rockburst formation mechanism.Based on the instability theory and stifness theory，a combination model consists of rockburst body and its surrounding rock was established using the three-dimension discrete element method （DEM）. With it the energy evolution process of the system is visualized through secondary development and the ejection phenomenon of rockburst is simulated successfully.Based on the numerical simulation，the tempo characteristics and energy evolution patterns of instability of the system are studied. The results show that the rockburst rock body reaches the peak stress slightly earlier than the surrounding rock body. The rupture and softening of the rockburst body after the peak stress results in the unloading of the surrounding rock body，and causes its stress change from increases to decreases.The surrounding rock mass then has a rapid rebound deformation to the rockburst body，and the elastic energy stored in the surounding rock body converges to the rockburst body.In this process，the positive feedback regulation mechanism formed by the interaction of the two subsystems accelerates the fracture process and finaly leads to dynamic instability. The research results can provide theoretical reference and technical support for further revealing the rockburst mechanism.

Keywords： rockburst； mutation moment; dynamic behavior; energy evolution; discrete element method

近年来，在“向地球深部进军”科技战略的指导下，深埋地下工程建设步入了新的高峰期。（剩余19263字）