Fiber Reinforcement for Soils and Stability of Fiber-Reinforced Soil Structures

摘要9820832美国约翰霍普金斯大学麦卡洛夫斯基研究所最近在岩土工程中尝试了纤维等短夹杂的土体加固方法。这项技术不是常规使用，因为缺乏关于其有效性的良好记录的证据，并且因为目前缺乏预测纤维增强土壤的特性(特别是强度)的能力。建议开展研究，以便更好地理解和定量描述这种复合材料的行为。这项研究的目的是：(A)更好地了解纤维增强机理，(B)对这种复合材料(模型)进行合理的(在设计上有用的)定量描述，(C)为建模工作的验证收集实验证据，以及(D)对纤维增强结构进行合理的分析。理论研究的重点将放在细观力学和均匀化上，并将使用实验室测试来验证所开发的模型。细观力学研究将包括土壤-纤维相互作用和单一纤维对基质变形的响应。均化将包括对纤维增强土的宏观行为的描述，这是将单纤维单元行为扩展到具有任意分布的纤维的复合系统的结果。这项研究的意义将在于发展合理的纤维加筋土体描述，从而为此类复合材料的设计提供可靠的方法。提出合理的纤维加筋土结构分析方法，有望对工程实践产生直接影响。

Abstract 9820832 PI: Radoslaw L. Michalowski Institution: Johns Hopkins University "Fiber Reinforcement for Soils and Stability of Fiber-Reinforced Soil Structures" Soil reinforcement with short inclusions, such as fibers, has been tried recently in geotechnical construction. This technique is not used routinely because of the absence of well-documented evidence of its effectiveness, and because of a current lack of ability to predict the properties (strength in particular) of fiber-reinforced soils. It is proposed that research toward a better understanding and quantitative description of the behavior of such composites be undertaken. The objectives of this research are to: (a) develop better understanding of fiber reinforcement mechanisms, (b) achieve a reasonable (useful in design) quantitative description of such composites (models), (c) collect experimental evidence for validation of the modeling effort, and (d) develop rational analyses of fiber-reinforced structures. The focus in the theoretical investigation will be on the micromechanics and homogenization, and laboratory testing will be used to validate the models developed. Micromechanics investigation will include soil-fiber interaction and response of a single fiber to deformation of the matrix. The homogenization will include description of the macroscopic behavior of the fiber-reinforced soil as a result of extending single-fiber cell behavior to a composite system with fibers distributed in an arbitrary fashion. The significance of this research will be in development of rational description of fiber-reinforced soils so that reliable methods for design with such composites can be developed. Presenting reasonable methods of analysis of fiber-reinforced soil structures is expected to have a direct impact on engineering practice.