MRI: Acquisition of Fiber Optic & Tiltmeter Systems for Measuring Deformations in Deep Underground Facilities

MRI：光纤采集

• 批准号: 0821788
• 负责人: Mary MacLaughlin
• 金额: $ 48.88万
• 依托单位: Montana Technological University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-15 至 2011-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0821788&HistoricalAwards=false
• 关键词: MRI; Acquisition; Fiber; Optic; &amp

This award will provide funding to acquire state-of-the-art fiber optic and tiltmeter sensor systems for monitoring deformations in deep underground facilities, such as tunnels, mines, and laboratories. The research facilitated by this acquisition will entail utilization of existing fiber optic technology, but in a relatively novel application and at a site (the proposed DUSEL site located at the former Homestake Mine in Lead, SD) that would provide exciting potential for building long-term research synergy. Fiber optic instruments have previously been used in other engineering applications, but this will be the first comprehensive study of their performance in the challenging underground environment of large excavations in rock. Measurements of rock deformation will be made and compared in different spatial and temporal scales, at sites with drastically different expected behavior. The distributed and localized strain measurements at the DUSEL site will provide a crucial infrastructure database for several geomechanics, hydrology, and geoengineering experiments. The large volume of coverage makes it ideal for calibrating a mine-scale finite element model of deformation; as such, the fiber-optic strain experiment will contribute to design and construction of large rooms and to mine safety. Specifically, the fiber optic network will contribute to: (1) understanding how rock masses deform as a function of spatial scale over long times, (2) interpreting mine seismicity experiments, (3) testing of the coupling between fracture flow and deformation, and (4) safety as it provides a large-volume indication of the mine ?breathing? and can be deployed with a common measurement protocol for cavern monitoring. While there is a focus on deploying the fiber optic instrumentation in the Homestake site as part of the DUSEL initiative, other sites will serve to develop deployment and interpretation techniques and as locations for comparative studies. These include a) Fermilab in Illinois, where a tiltmeter-based monitoring system is already in place and has produced a 2-year database of observations, and b) actively-deforming mines, both coal and hardrock, to allow evaluation of the performance of the monitoring systems in less than ideal working conditions, in which the rock is expected to undergo substantial movement. A comprehensive comparative study such as this will lead to much wider use of this technology in the mining and tunneling industries. Research focused on providing a safe working environment in the subsurface has been central to Montana Tech for its entire century of existence. The new equipment will allow Montana Tech to make substantial new contributions in this area, benefiting operation of subsurface facilities and those who work there. Acquisition of these monitoring systems will also provide an unprecedented and very exciting opportunity for Montana Tech faculty to collaborate with high level researchers from the premiere doctoral institutions in the U.S. DUSEL is an exceptional opportunity for university, industry, and national laboratory researchers to work in partnership on problems from construction to basic geoscience and geo-engineering by occupying a single in situ, large-volume, underground laboratory with three-dimensional access. K-12 through graduate students and the public will gain an appreciation of how knowledge about underground rock mass response is gained by observing researchers pose questions, conduct experiments, make observations, and analyze and interpret the results. Montana Tech has very strong Undergraduate Research Program, and the opportunity to conduct research at the DUSEL is expected to be particularly attractive to student researchers. The PI has demonstrated great success involving female students and undergraduates in her research.

该奖项将为获得最新的光纤和倾斜度传感器系统提供资金，以监视深层地下设施（例如隧道，矿山和实验室）的变形。 此次收购促进的研究将需要利用现有的光纤技术，但是在相对新颖的应用中，在一个站点（拟议的Dusel网站）（位于SD的前Homestake Mine的拟议的Dusel网站）中，这将为建立长长的长期潜力提供令人兴奋的潜力。术语研究协同作用。 光纤仪器以前曾在其他工程应用中使用，但这将是对它们在岩石中大型发掘的充满挑战的地下环境中的首次全面研究。 在具有截然不同的预期行为的位点，将在不同的空间和时间尺度上进行岩石变形的测量。 Dusel位置的分布式和局部应变测量值将为多种地质力学，水文学和地球工程实验提供关键的基础设施数据库。 大量覆盖范围使其成为校准矿尺度有限元模型的理想选择。因此，光纤应变实验将有助于大型房间的设计和建造和安全的安全。 具体而言，光纤网络将有助于：（1）理解岩体在长期内如何变形作为空间尺度的函数，（2）解释地雷地震性实验，（3）对断裂流和变形和变形之间的耦合的测试，以及（4）安全性，因为它提供了大量的呼吸指示？并且可以使用用于洞穴监测的通用测量协议来部署。尽管作为Dusel Initiative的一部分，虽然重点是将光纤仪器部署在Homestake站点中，但其他站点将有助于开发部署和解释技术，并作为比较研究的位置。 其中包括a）在伊利诺伊州的fermilab，在伊利诺伊州，基于倾斜表的监测系统已经到位，并产生了2年的观察数据库，b）煤炭和煤炭的积极性矿山，以允许评估性能的性能。监测系统在不理想的工作条件下，预计岩石会经历大量运动。 诸如此类的全面比较研究将导致该技术在采矿和隧道行业中更广泛地使用。侧重于在地下提供安全的工作环境的研究一直是蒙大拿州技术的核心。 新设备将使蒙大拿州技术在这一领域做出重大贡献，从而使地下设施和在那里工作的设施的运营受益。 收购这些监测系统还将为蒙大拿州技术学院提供一个前所未有且令人兴奋的机会关于从施工到基本地球科学的问题，以及通过占用单个原位，大容量的地下实验室，具有三维访问的问题。 通过研究生和公众，K-12通过观察研究人员提出问题，进行实验，进行观察以及分析和解释结果来获得有关如何获得有关地下岩体反应的知识的理解。蒙大拿州理工学院拥有非常强大的本科研究计划，并且有机会在Dusel进行研究的机会对学生研究人员特别有吸引力。 PI在研究中涉及女学生和本科生取得了巨大的成功。