DYNAMIC FAILURES OF ROCKS SUBJECTED TO CONFINEMENTS

在世界范围内，增加岩石工程的作业深度是一个趋势。与深度相关的高地应力给岩石工程师带来了巨大的挑战。作为加拿大经济的主要参与者，采矿业和石油业因此非常需要了解高地应力对岩石力学特性的影响。针对高地应力对岩石动力响应的影响，本课题拟进行系统的实验研究。采用最新开发的创新围压单元模拟高地应力，采用最先进的分离式霍普金森压杆（SHPB）系统施加动载荷。利用申请人开发的创新测试方法，将对模拟高地应力的各种约束条件下岩石的动态岩石特性进行系统研究。首次研究了岩石在三轴约束、静水约束和预拉伸条件下的压缩、拉伸、剪切、弯曲和断裂等完整的动态特性。这项研究的结果将大大有利于加拿大与自然资源有关的经济。在这项建议中，将培训不同级别的高素质人员，他们将成为加拿大就业市场的宝贵贡献者。提出的前沿研究也将使加拿大成为地下岩石工程问题岩石动力学的领先国家。

There is a worldwide trend for the increase of the operation depth in rock engineering projects. The high in-situ stress associated with the depth poses grand challenges to rock engineers. As major economic players in the Canadian economy, mining and petroleum industries are thus in great need to understand the effect of high in-situ stress on the mechanical properties of rocks. To specifically address the effect of high in-situ stress on the dynamic responses of rocks, systematic experimental research is planned in this proposal. High in-situ stresses are simulated using a recently developed innovative confining cell and dynamic loads are exerted by a state of the art split Hopkinson pressure bar (SHPB) system. Using innovative testing methods developed by the applicant, systematic investigations on the dynamic rock properties of rocks under various confinements simulating high in-situ stresses will be carried out. Complete set of dynamic properties of rocks, including compression, tension, shear, bending, and fracture properties will be studied under triaxial confinement, hydrostatic confinement and pre-tension for the first time. The outcome of the research will significantly benefit the economy of Canada relevant to natural resources. In this proposal, highly qualified personnel of different levels will be trained and will be valuable contributors to the Canadian job market. The cutting-edge research proposed will also position Canada as the leading nation of rock dynamics in underground rock engineering problems.