New Design Criteria for Soil-Construction Material Interface Systems

CMS-0201482PI：Joseph DoveInstitution：弗吉尼亚理工学院和州立大学标题：“土与建筑材料界面系统的新设计标准”摘要岩土工程设计的许多方面的核心是确定土壤材料与人造夹杂物之间的局部相互作用如何决定岩土复合系统的整体行为。无论夹杂物是土工合成材料、钢材、混凝土，还是有待开发的新材料，土壤和建筑材料之间的相互作用都受到与可测量特性相关的基本物理原理的支配。不幸的是，对于研究和实践社区可用的接口系统预测关系很少(如果有的话)。这一缺陷是重要的，因为正在出现需要密切控制界面电阻的创新应用。该项目的目标是：1)制定新的实用的界面系统设计方法和工具；2)在二维和三维上量化土-建筑材料界面的细观力学行为；以及3)确定控制给定土壤材料和夹杂几何形状的界面行为的空间尺度。以前由NSF赞助的研究结果、实验室测试计划以及二维和三维离散元素微机械模型将用于实现这些目标。在实验和建模中要解决的具体问题包括颗粒形状的作用；表面形貌；相对硬度；颗粒相对于表面粗糙度的运动；颗粒破碎；以及固体表面磨损对界面剪切带内土壤的强度和扩张性的影响。这项研究的广泛影响将在五个主要影响领域实现：教育和研究的一体化；少数群体和妇女的参与；加强研究的基础设施；快速和广泛地传播研究成果；以及社会效益。通过将研究成果和新材料引入本科生和研究生课程，将教育和研究结合在一起。PIS将继续其长期的做法，通过REU计划让本科生参与研究。鼓励代表人数不足的少数群体和妇女参加。参与这个项目的博士生将成为她的女研究生和本科生同事的榜样。McNair学者，特别是来自阿巴拉契亚地区的学者，将积极招募他们在这个项目上进行暑期实习，并作为研究生。制作的三维模型和算法将为解决土壤/结构相互作用问题提供先进的计算资源，从而加强研究和教学基础设施。此外，项目结果将在印刷媒体和网络媒体上广泛传播。将在万维网上以可下载格式创建表面轮廓数据库。最后，整个社会将受益于节省成本的机会和技术进步。

CMS-0201482PI: Joseph DoveInstitution: Virginia Polytechnic and State UniversityTitle: "New Design Criteria for Soil and Construction Material Interface Systems" AbstractCentral to many facets of geotechnical engineering design is the problem of determining how local interactions between soil materials and manufactured inclusions dictate overall behavior of a geotechnical composite system. Whether the inclusion is geosynthetic, steel, concrete, or a new material yet to be developed, the interactions between soil and construction materials are governed by underlying physical principles related to measurable properties. Unfortunately, there are few, if any, predictive relationships for interface systems available to the research and practice communities. This deficiency is important because innovative applications are arising which require close control over interface resistance. The goals of this project are to: 1) Formulate new practical design methods and tools for interface systems; 2) Quantify the micro-mechanical behavior of soil-construction material interfaces in two- and three-dimensions; and 3) Determine the spatial scales that control behavior of interfaces for a given soil material and inclusion geometry. Results from previous NSF-sponsored research, a laboratory testing program, and two and three-dimensional discrete element micromechanical models will be used to accomplish these goals. Specific issues to be addressed in the experiments and modeling include the role of grain shape; surface topography; relative hardness; particle movements with respect to the surface asperities; particle breakage; and, solid surface wear on the strength and dilatancy of the soil within the interface shear zone.Broader impacts of this research will be realized in five primary impact areas: integration of education and research; participation of minorities and women; enhancing infrastructure for research; rapid and broad dissemination of research results; and, societal benefits. Education and research will be integrated by bringing research results and new materials into undergraduate and graduate courses. The PIs will continue their long-standing practice of involving undergraduate students in research through the REU program. Participation of underrepresented minorities and women is encouraged. The Ph.D. student involved in this project will serve as a model for her fellow women graduate and undergraduate student colleauges. McNair Scholars, especially those from the Appalachian region, will be actively recruited to conduct their summer internship on this project, and as graduate students. The three-dimensional models and algorithms produced will enhance the research and teaching infrastructure by providing advanced computing resources for solving problems in soil/structure interaction. In addition, project findings will be widely disseminated in print and web-based media. A surface profile database will be created in downloable format on the world wide web. Finally, society at large will benefit from cost saving opportunities and technological advancement.