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

9875495明尼苏达大学博扬·B·古吉纳职业生涯：波浪法现场岩土和路面表征的合理框架摘要本项目的目的是为波法现场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融入土木工程课程。利用目前的计算能力，将研究开发一种用于实际场地表征的混合技术，该技术将以系统和严格的方式考虑诱导波传播的三维性质、土的硬度、密度和阻尼。它包括正反向波传播分析的发展，以及它们在岩土场地和路面地震测深的有效现场技术中的应用。除了揭示现场的波速和衰减剖面外，新方法还将能够提供地震测量中通常无法获得的独立的刚度和质量密度信息。利用该方法对土体、岩石和沥青的动态特性进行综合描述，可广泛应用于岩土取样方案的规划、地基对动载作用的设计、土壤液化势的评价、路面监测和维修等方面。为促进该项目的实施阶段，与明尼苏达州交通部建立了合作关系，将提供适当的实地测试设备和独特的试验场。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，将努力设计一门关于土木工程中波动方法的新课程，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.