Laboratory Study of Stick-Slip Behavior and Deformation Mechanics of Subglacial Till

冰下碴粘滑行为及变形力学的室内研究

• 批准号: 0538195
• 负责人: Chris Marone
• 金额: $ 27.5万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-03-01 至 2009-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0538195&HistoricalAwards=false
• 关键词: Laboratory; Study; Stick; Slip; Behavior

0538195MaroneThis award supports a project to conduct laboratory experiments and numerical modeling to determine the constitutive properties of subglacial till under dynamic stressing and to test the hypothesis that granular properties of till are sufficient, when coupled elastically to a large ice stream, to reproduce the field observations of triggered slip and subglacial seismicity. Testing will be carried out in a servo-controlled biaxial shear device under controlled temperature and stress conditions, which will allow both sliding and microstructural processes to be studied in detail. The main focus of the work will be on laboratory measurements. In addition, we will construct continuum models to evaluate whether our results can predict complex ice sheet motions and observed characteristics of subglacial seismicity. In terms of broader impacts, the proposed work will encourage interactions between the rock-mechanics and glaciology communities and will bring together members of different scientific backgrounds and vocabularies, but similar problems and data. The project will train undergraduate and graduate students at Penn State University and the scientists involved plan to give presentations to grade school classes, scout groups, and at community open houses. Results will be presented at professional meetings and will be published in a timely manner. The work will result in a better understanding of glacial motion and the physics of earthquake slip, which is essential for understanding ice sheet dynamics and earthquake hazard.

[05:38 . 195]该奖项支持一个项目进行实验室实验和数值模拟，以确定冰下土层在动力应力下的本构性质，并测试土层的颗粒性质足以与大冰流弹性耦合的假设，以重现触发滑移和冰下地震活动的现场观测。测试将在控制温度和应力条件下的伺服控制双轴剪切装置中进行，这将允许对滑动和微观结构过程进行详细研究。这项工作的重点将放在实验室测量上。此外，我们将构建连续体模型来评估我们的结果是否可以预测复杂的冰盖运动和观测到的冰下地震活动特征。就更广泛的影响而言，拟议的工作将鼓励岩石力学和冰川学团体之间的互动，并将不同科学背景和词汇的成员聚集在一起，但问题和数据相似。该项目将培训宾夕法尼亚州立大学的本科生和研究生，参与其中的科学家计划向小学班级、童子军团体和社区开放日发表演讲。研究结果将在专业会议上公布，并及时公布。这项工作将有助于更好地了解冰川运动和地震滑动的物理性质，这对了解冰盖动力学和地震危险性至关重要。