CAREER: A Rational Framework for In-situ Geotechnical and Pavement Characterization by Wave Methods

[875495] Bojan B. Guzina明尼苏达大学职业：基于波浪法的原位岩土和路面表征的合理框架摘要本项目旨在为采用波浪法进行场地表征提供先进的分析和实验基础，并将弹性波传播和无损检测的基本原理整合到土木工程课程中。利用现有的计算能力，将研究开发一种混合技术，用于实际场地表征，该技术将系统而严格地考虑诱导波传播、土壤刚度、密度和阻尼的三维性质。它包括正波和反波传播分析的发展，以及它们在岩土工程场地和路面地震测深中的有效应用。除了揭示原位波速和衰减曲线外，新方法还能够提供通常无法从地震测量中获得的独立刚度和质量密度信息。通过提出的技术对动态土壤、岩石和沥青特性的全面描述可以在广泛的应用中找到用途，例如岩土取样方案的规划、动态荷载基础的设计、土壤液化潜力的评估以及路面监测和修复。为了促进项目的执行阶段，已同明尼苏达州运输部建立了合作关系，提供使用适当的实地测试设备和独特的实验场地的机会。上述研究计划将与课程开发工作一起进行，以促进在土木工程中越来越多地使用无损检测。为此，将努力设计一门土木工程波浪法的新课程，并开发一套数字教学模块，向学生介绍弹性波传播的基本原理及其在现场和实验室测试中的应用。

9875495 Bojan B. Guzina University of Minnesota CAREER: A Rational Framework for In-situ Geotechnical and Pavement Characterization by Wave Methods ABSTRACT The aim of this project is to provide an advanced analytical and experimental basis for site characterization by wave methods and to integrate the fundamentals of elastic wave propagation and non-destructive testing into the civil engineering curriculum. Making use of current computational power, research will be conducted to develop a hybrid technique for realistic site characterization that would account for the three-dimensional nature of the induced wave propagation, soil stiffness, density and damping in a systematic and rigorous manner. It includes the developments in forward and inverse wave propagation analyses and their implementation into an effective field technique for seismic sounding of geotechnical sites and pavements. In addition to revealing the in-situ wave velocity and attenuation profiles, the new method will be capable of furnishing the independent stiffness and mass density information that is typically not available from seismic measurements. A comprehensive delineation of dynamic soil, rock and asphalt properties by means of the proposed technique may find use in a wide range of applications such as planning of geotechnical sampling programs, design of foundations to dynamic loads, evaluation of the soil liquefaction potential, and pavement monitoring and repair. To facilitate the implementation phase of the project, a collaboration with the Minnesota Department of Transportation has been established which will provide access to an appropriate field testing equipment and a unique experimentation site. The foregoing research program will be conducted in conjunction with a curriculum development effort to foster the growing use of non-destructive testing in civil engineering. To this end, efforts will be directed to design a new course on wave methods in civil engineering, and to develop a set of digital instructional modules that would introduce students to the fundamentals of elastic wave propagation and their applications to field and laboratory testing by wave methods.