High pressure / High Temperature Geomechanical Triaxial Test Cell with Integrated Pore Pressure Monitoring and Acoustic and Strain Transducer Arrays

将得到支持的研究项目是女王大学的Diederichs博士的项目，该项目涉及在受限高温载荷下对岩石进行早期损伤检测。这里要求的设备将成为与设计用于长期储存核废料的竖井、隧道和洞穴周围的挖掘破坏有关的试验工作的重要基石。这种储存库的围岩的长期稳定性和极限渗透性取决于在建造、运营期间和储存库的长期寿命期间控制开挖周围的损害发展水平。这一长期阶段包括温度和孔压的影响。块状岩石的长期下限强度与在走向最终破坏的过程中，在中等应力水平下观察到的可测量的损伤开始有关。这一损伤阈值和随后的损伤在样品中的传播可以在测试过程中通过高精度的应变测量或通过声学监测(“监听”与开裂相关的微声发射)来监测。然而，在基础研究方面特别令人感兴趣的是损伤起始应力阈值对岩石的围压、温度和孔压的依赖关系。在安大略省废物储存库的容器寿命期间，这些条件是可以预期的。可能的候选岩石包括花岗岩、石灰岩、页岩和可能的大型变质杂岩。预计这些岩石在预期的储存库条件下会有不同的表现，因此有必要对这里提出的类型进行调查。所要求的设备将所有监测需求整合到一个专门建造的系统中，并提供一个独特的、高度受控的测试环境。

The research program to be supported is that of Dr. Diederichs at Queen's University and involves early damage detection in rock under confined, high temperature loading. The equipment being requested here will form an important cornerstone in the experimental work related to excavation damage around shafts, tunnels and caverns designed for long term storage of nuclear waste. The long term stability and limiting permeability of the host rocks for such a repository depend on controlling the levels of damage development around the excavations during construction, operation and over the long term life of the repository. This long term phase includes temperature and porepressure influences. Long term lower bound strength of massive rock has been linked with the measurable onset of observed damage at intermediate stress levels enroute to ultimate failure. This damage threshold and the subsequent damage propagation within the sample can be monitored with highly accurate strain measurement during testing or with acoustic monitoring ("listening" for micro-acoustic emissions associated with cracking). Of particular interest in terms of fundamental research, however, is the dependency of damage initiation stress thresholds on confining stress, temperature and pore pressure of rocks. These conditions are to be expected during the containment lifespan of an Ontario-based waste repository. Possible candidate rocks include granitic rocks, limestones, shales and possibly massive metamorphic complexes. These rocks are expected to behave differently under the expected repository conditions, necessitating investigation of the type proposed here. The equipment requested integrates all of the monitoring needs into one purpose built system and provides a unique and highly controlled testing environment.