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

具有集成孔隙压力监测以及声学和应变传感器阵列的高压/高温地质力学三轴测试单元

• 批准号: 422900-2012
• 负责人: Diederichs, MarkStephen
• 金额: $ 10.93万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=495864
• 关键词: pressure; Temperature; Geomechanical; Triaxial; Test

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.

该研究项目由皇后大学的Diederichs博士资助，涉及在高温承压条件下对岩石进行早期损伤检测。这里所要求的设备将成为与长期储存核废料的竖井、隧道和洞穴周围挖掘损坏有关的实验工作的重要基石。对于这样的处置库，围岩的长期稳定性和极限渗透性取决于在施工、运行期间和处置库的长期寿命期间控制开挖周围的损害发展水平。这个长期阶段包括温度和孔隙压力的影响。大块岩石的长期下限强度与在中间应力水平下观察到的损伤的可测量的开始相关联，从而导致最终破坏。该损伤阈值和随后的样品内的损伤传播可以在测试期间通过高精度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感兴趣的是损伤起始应力阈值对岩石的围压、温度和孔隙压力的依赖性。这些条件是预期在安大略省的废物处置库的遏制寿命。可能的候选岩石包括花岗岩、石灰岩、页岩和可能的块状变质杂岩。预计这些岩石在预期的处置库条件下会有不同的表现，因此有必要对此处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用系统中，并提供一个独特和高度受控的测试环境。