Exploring the Relationship between Vibratory Roller-Based

探讨振动压路机与基础之间的关系

• 批准号: 1030976
• 负责人: Michael Mooney
• 金额: $ 29.53万
• 依托单位: Colorado School of Mines
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-09-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1030976&HistoricalAwards=false
• 关键词: Exploring; Relationship; between; Vibratory; Roller

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.

在压实过程中和压实之后（通常称为智能压实）对土壤性质（即土壤刚度）的基于振动辊的测量提供了一种非常有前途的工具，以改善土结构（例如，堤坝、土坝、堤坝、路面铁路基础）。该补助金为有限元模型的创建，校准和验证提供资金，以解释智能振动压路机压实过程中产生的振动压路机测量数据。研究方法将涉及实验和数值模拟程序，以量化实时振动压路机测量和分层压实土壤基础的动态材料特性之间的关系。实验计划将利用仪器振动压路机收集力偏转测量12配置的分层土壤，在现场三轴加速度计将被用来测量地下动态响应。在受控的实验室环境中，还将使用共振柱装置来量化组分土壤的应力和应变相关弹性模量和粘性阻尼比。数值建模程序将涉及12个现场配置的动态有限元模拟，使用土壤的动态特性、测量的滚筒/土壤接触面积和滚筒负载作为输入，现场加速度和力偏转测量值作为输出，用于校准和验证。 该研究旨在通过将实时施工监测与结构、性能相关的土壤参数相关联来推进智能施工。一个土壤的估值？的弹性刚度通过振动压路机测量的数据可以直接关系到设计的土结构的属性，性能标准，然后可以使用这些数据结合定量力学框架，而不是经验的指导方针进行测试。为此，将结合实验收集的振动压路机测量值创建和校准的有限元模型可用于缩小设计-施工差距，并有助于改善土工结构的生命周期性能。预期的研究结果将是有价值的各种领域以外的辊为基础的测量土壤的性质，推进非线性，分层土壤的行为的理解受到复杂的动态载荷的情况。此外，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纳入岩土工程教育。网络环境将利用动画，视频和互动来传达基于辊的测量原理，总结基于模量的测量技术，审查使能技术，并解释模量-水分-密度的基本原理。