Strain burst occurs within highly stressed hard rocks in underground excavations. A prerequisite for strain bursting is that excess energy exists to eject material after rock failure. Both the bursting rock and the surrounding rock mass will contribute to the excess energy. However, the proportion of the energy contributed from each is currently not well understood. This issue will be quantitatively investigated in this study. In this paper, the energy sources for strain bursting and the energy conversion during bursting are first illustrated in two conceptual models. The portions of the energy dissipated and released from the bursting rock and the surrounding rock mass are differentiated by means of numerical modeling. The numerical modeling shows that the proportion of energy released from the surrounding rock mass increases with increasing burst depth. Beyond a critical burst depth, the energy released from the surrounding rock mass becomes higher than the energy stored in the bursting rock. This concept was further verified by an analytical solution to the behavior of a circular opening when its radius is enlarged. Based on the study, it can be concluded that the magnitude of the burst is mainly determined by the strain energy released from the bursting rock itself in a shallow burst event, but it is more associated with the energy released from surrounding rock mass in a large scale burst event.

应变爆发发生在地下开挖的高应力硬岩中。应变爆发的先决条件是在岩石破坏后存在多余的能量来喷射材料。爆裂的岩石和周围的岩体都会产生多余的能量。然而，目前尚不清楚每种能量贡献的比例。这个问题将在本研究中进行定量研究。在本文中，首先在两个概念模型中说明了应变爆裂的能量来源和爆裂过程中的能量转换。通过数值模拟区分爆破岩体和围岩体耗散和释放的能量部分。数值模拟表明，围岩释放的能量比例随着爆裂深度的增加而增加。超过临界爆裂深度，从周围岩体释放的能量变得高于储存在爆裂岩石中的能量。通过对圆形开口半径扩大时的行为的解析解进一步验证了这一概念。综合研究可以得出结论，爆破的大小主要由浅层爆破事件中爆破岩石自身释放的应变能决定，但在大范围的爆破事件中更多与围岩释放的应变能相关。规模爆发事件。通过对圆形开口半径扩大时的行为的解析解进一步验证了这一概念。综合研究可以得出结论，爆破的大小主要由浅层爆破事件中爆破岩石自身释放的应变能决定，但在大范围的爆破事件中更多与围岩释放的应变能相关。规模爆发事件。通过对圆形开口半径扩大时的行为的解析解进一步验证了这一概念。综合研究可以得出结论，爆破的大小主要由浅层爆破事件中爆破岩石自身释放的应变能决定，但在大范围的爆破事件中更多与围岩释放的应变能相关。规模爆发事件。