Exploring the Relationship between Vibratory Roller-Based

基于振动压路机的土壤特性（即土壤刚度）测量在压实期间和之后（通常被称为智能压实）提供了一个非常有前途的工具，以改善施工，从而改善土结构（例如，堤防，土坝，堤防，路面和铁路基础）的性能。该基金为有限元模型的创建、校准和验证提供资金，以解释智能土方压实过程中产生的振动压路机测量数据。研究方法将包括实验和数值模拟程序，以量化实时振动压路机测量与层状压实地基的动态材料特性之间的关系。实验项目将利用仪器振动压路机收集12种层状土壤结构的力挠度测量数据；现场三轴加速度计将用于测量地下动力响应。一个共振柱装置也将用于量化应力和应变相关的弹性模量和粘性阻尼比的组成土壤在受控的实验室环境。数值模拟程序将涉及12种现场配置的动态有限元模拟，使用土壤的动态特性、测量的滚轮/土壤接触面积和滚轮载荷作为输入，并将现场加速度和力挠度测量作为输出，以进行校准和验证。该研究旨在通过将实时施工监测与本构、性能相关的土壤参数联系起来，推进智能施工的努力。对土壤的估计？S弹性刚度通过振动压路机实测数据可以直接关系到土方结构的设计性能；然后，可以使用这些数据结合定量机制框架（而不是经验指导方针）对绩效标准进行测试。为此，将与实验收集的振动压路机测量数据一起创建和校准的有限元模型可用于缩小设计与施工之间的差距，并有助于改善土方结构的生命周期性能。预期的发现将有价值的各种领域，超越基于滚轮的土壤性质的测量，推进对非线性的行为的理解，层状土壤受到复杂的动态加载场景。此外，还将创建一个基于网络的模块，将土壤压实的最新进展和当前研究整合到岩土工程教育中。网络环境将利用动画、视频和交互来传达基于滚筒的测量原理，总结基于模量的测量技术，回顾使能技术，并解释模量-湿度-密度的基本原理。

Vibratory roller-based measurement of soil properties (namely soil stiffness) during and after compaction (often referred to as intelligent compaction) offers an exceptionally promising tool to improve the construction and thus performance of earth structures (e.g., embankments, earth dams, levees, pavement & railway foundations). This grant provides funding for the creation, calibration, and validation of finite element models to interpret of vibratory roller-measured data generated in intelligent earthwork compaction procedures. The research approach will involve experimental and numerical modeling programs to quantify the relationships between real-time vibratory roller measurements and the dynamic material properties of layered compacted soil foundations. The experimental program will utilize instrumented vibratory rollers to collect force-deflection measurements on 12 configurations of layered soils; in-situ triaxial accelerometers will be used to measure subsurface dynamic response. A resonant column device will also be used to quantify the stress and strain-dependent elastic moduli and viscous damping ratios of the component soils in a controlled laboratory environment. The numerical modeling program will involve dynamic finite element simulations of the 12 field configurations, using the soils' dynamic properties, the measured roller/soil contact area, and roller loading as input and the field accelerations and force-deflection measurements as output for calibration and validation. The research aims to advance efforts in intelligent construction by relating real-time construction monitoring to constitutive, performance-related soil parameters. The estimation of a soil?s elastic stiffness through vibratory roller-measured data can be directly related to designed-for properties of earth structures; performance criteria may then be tested using these data in conjunction with a quantitative mechanistic framework as opposed to empirical guidelines. To this end, the finite element models that will be created and calibrated in conjunction with experimentally gathered vibratory roller measurements can be used to close the design-construction gap and contribute to improved lifecycle performance of earth structures. The anticipated findings will be valuable to a variety of areas beyond roller-based measurement of soil properties, advance the understanding of the behavior of nonlinear, layered soils subjected to complex dynamic loading scenarios. In addition, a web-based module will be created to integrate recent advances and current research in soil compaction into geotechnical education. The web environment will take advantage of animations, videos, and interaction to convey roller based measurement principles, summarize modulus based measurement techniques, review enabling technologies, and explain modulus-moisture-density fundamentals.