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将时变结构力学理论应用于岩爆发生机制的研究,以一个新的角度对岩爆动力源进行分析。地下洞室的围岩存在具有承载能力的自稳结构,首次提出了“自稳时变结构”的概念,定性地分析了临近开挖洞室的围岩自稳时变结构的特点。应用质点系动量定理,分析了围岩自稳时变结构的动力学响应。围岩自稳时变结构的质量随时间发生变化时,系统会出现负阻尼的情况,会形成动力不稳定系统而诱发岩爆。建立了围岩自稳时变结构诱发岩爆的力学模型,由力学模型可得出岩爆发生的两个条件:①围岩承受的切向应力σθ应使岩石产生扩容;②围岩自稳时变结构的质量减少。研究表明:岩爆的发生机制可通过围岩自稳时变结构理论得到很好的解释。
The time-varying structural mechanics theory is applied to the research of rockburst mechanism, and a new perspective of rockburst power source is analyzed. The surrounding rock of underground caverns has a self-stabilizing structure with load-carrying capacity. The concept of “self-stabilizing time-varying structure” is proposed for the first time, and the characteristics of the self-stabilized time-varying structure of surrounding rock are analyzed qualitatively. Using the momentum theorem of particle system, the dynamic response of the time-dependent structure of the surrounding rock is analyzed. When the mass of the surrounding rock self-stable time-varying structure changes with time, the system will have negative damping situation, which will result in the dynamic instability system and the rock burst. The mechanical model of rockburst induced by time-dependent structure of surrounding rock is set up. Two conditions of rockburst can be obtained from the mechanical model: ① The tangential stress σθ of the surrounding rock should make the rock expand; The quality of time-varying structures decreases. The research shows that the mechanism of rockburst can be explained well by the theory of time-dependent structure of surrounding rock.