Drift destressing in deep mines.

应变冲击是指在坚硬岩石的深部矿山中，从前进的巷道的工作面或侧壁上发生的不可预测的、经常是剧烈的岩石喷射。随着安大略省许多地雷埋深的增加，这些事件的发生率也在增加，这导致地雷人员受伤的风险增加。多年来，人们开发了减压技术来缓解这个问题，减压技术通常涉及爆破。应力爆破的目的是改变岩体的性质，从而降低开挖边界处的高应力。关于这一过程的机理（气体压力与新裂缝的产生）存在着相互矛盾的解释。这些机制没有通过测量清楚地确定，也没有确定会触发使用减压的条件。因此，目前减压爆破的设计完全是经验性的。

Strainbursting is the unpredictable and often violent ejection of rock from the face or sidewalls of advancing drifts in deep mines in hard rock. With the increasing depth of many mines in Ontario, the incidence of these events is increasing, which is leading to increasing risk of injury to mine personnel. Over the years, techniques known as destressing, which normally involve blasting, have been developed to alleviate this problem. The objective of destress blasting is to alter the properties of the rock mass in such a way that high stresses at the excavation boundaries are reduced. There are competing explanations for the mechanisms of how this works (gas pressure vs creation of new fractures). Those mechanisms have not been clearly identified through measurement, nor have the conditions been identified which would trigger the use of destressing. As a result, current design of destressing blasts is entirely empirical.