Drift destressing in deep mines.

应变爆裂是指在硬岩深矿井中，岩石从前进巷道的工作面或侧壁发生不可预测且经常剧烈的喷射。随着安大略省许多矿井深度的增加，这些事件的发生率也在增加，导致矿井人员受伤的风险不断增加。多年来，人们开发出了一种称为去应力的技术，通常涉及爆破，以缓解这个问题。去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。对于其工作机制（气体压力与新裂缝的产生）存在相互竞争的解释。这些机制尚未通过测量明确确定，也未确定触发使用减压方法的条件。因此，目前的减压爆炸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.