CAREER: Stress Redistribution Imaging for Rock Failure Prediction

职业：用于岩石破坏预测的应力重新分布成像

• 批准号: 0134034
• 负责人: Erik Westman
• 金额: $ 37.5万
• 依托单位: Virginia Polytechnic Institute and State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-07-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0134034&HistoricalAwards=false
• 关键词: CAREER; Stress; Redistribution; Imaging; Rock

CMS-0134034PI: Erik WestmanInstitution: Virginia Polytechnic Institute and State UniversityTitle: "CAREER: Stress Redistribution Imaging for Rock Failure Prediction"This Faculty Early Career Development (CAREER) research and education project uses high-resolution, three-dimensional tomographic imaging to better understand and communicate the process of failure in rock. Accomplishing the ultimate goal of predicting rock mass failure will result in significantly reduced fatalities, lowered construction costs, and increased environmental protection. Failure prediction extends to all aspects of rock mechanics including tunnels, mines, rock slopes, earthquakes, waste repositories, and bridge and dam abutments. To predict rock failure, it is quite helpful to monitor the redistribution of stresses within the rock. Recent advances in computational power have allowed this to be done using acoustic waves and tomographic imaging. The basic principal behind monitoring the redistribution of stresses is that microfractures within the rock are closed under increased loading, allowing the acoustic wave to travel at a greater velocity and with less attenuation. This method has been used successfully in the laboratory and has had growing, but poorly founded, application in the field. This project will put the technique of imaging stress redistribution in rock on a sound theoretical and practical foundation by 1) standardizing methods and 2) extending results of prior studies into the gap between laboratory- and field-scale studies. Educational efforts related to rock failure prediction will also be enhanced.Specific tasks associated with both education and research include 1) generating three-dimensional tomographic images to observe relevant alterations to the fabric of rock samples loaded to failure, and 2) using those images to calibrate numerical modeling results. By collecting data as rock samples are loaded, time-lapse animations will be developed which will assist in the communication of stress-analysis to undergraduates. Additional educational efforts focus on transitioning from a presentational teaching method to a constructivist model for two of the proposer's undergraduate courses and developing a graduate-level course for understanding failure through coupled analysis of imaging and numerical modeling results.

CMS-0134034PI：ERIK WESTMANININITITION：弗吉尼亚理工学院和州立大学的著作：“职业：摇滚失败预测的压力重新分配成像”这项教师早期职业发展（职业）研究和教育项目使用高分辨率，高分辨率，三维层表术成像来更好地理解和交流岩石中的失败过程。 实现预测岩体质量故障的最终目标将大大减少死亡人数，降低建筑成本并增加环境保护。 故障预测扩展到岩石力学的各个方面，包括隧道，矿山，岩石斜坡，地震，废物存储库以及桥梁和大坝基台。 为了预测岩石故障，监视岩石内应力的重新分布非常有帮助。 计算能力的最新进展允许使用声波和断层扫描成像完成此操作。 监测应力重新分布的基本原理是，岩石内的微裂缝在增加的载荷下关闭，从而使声波以更大的速度和衰减较少的速度传播。 该方法已在实验室成功使用，并且在该领域的应用增长但建立不佳。 该项目将通过1）标准化方法和2）将先前研究的结果扩展到实验室和现场尺度研究之间的差距。 与岩石故障预测相关的教育工作也将得到增强。与教育和研究相关的特定任务包括1）生成三维层析成像图像，以观察到对岩石样品的结构进行相关的变化，以及2）使用这些图像来校准数值建模结果。 通过收集数据作为岩石样品的加载，将开发延时动画，这将有助于将压力分析与本科生进行交流。 额外的教育努力着重于从展示教学方法过渡到提议者的两个本科课程的建构主义模型，并通过耦合成像和数值建模结果的分析来开发研究生级课程，以理解失败。