基于应力及能量条件的岩爆发生机理研究

Study on Rock Burst Mechanism Based on Geo-Stress and Energy Principle

为了研究深井硬岩巷道岩爆发生的机理,结合大台井玄武岩区岩爆工程实践,分析了区域构造应力场特征,研究了区域内煤岩体的弹性潜能分布特征。从构造应力和能量的角度出发,分析了具有岩爆倾向性的巷道围岩产生岩爆时应具备的应力条件和能量条件。研究结果表明,在具有岩爆倾向性的岩体中掘进巷道,岩爆的产生应同时具备所需的应力条件和能量条件,岩爆的位置和剧烈程度与最大主应力方向有关。研究成果将对大台井岩爆防治,深部开采的水平大巷布置和巷道支护等提供理论依据。

In this paper, to study the mechanism of rock burst in hard rock roadway of deep mine, combined with the engineering practice of rock burst in basalt area of Datai Mine, the characteristics of regional tectonic stress field is analyzed, and the elastic energy distribution characteristics of coal-rock body in this area is studied. Meanwhile, in the view of the tectonic stress and energy, both the stress and energy conditions of roadway surrounding rock with burst tendency are further studied when rock burst happening. The results show that the happening of rock burst must be satisfied with the stress and energy conditions simultaneously when excavating roadway in rock mass with burst tendency, and the rock burst location and intensity are related to the direction of maximum principal stress. The research results in this paper will offer theoretical basis to the rock burst prevention, horizon roadway layout in deep mining, and roadway supporting, et al, in Datai Mine.