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

摘要：9820832 PI: Radoslaw L. Michalowski研究所：Johns Hopkins University“纤维加固土体与纤维加固土体结构的稳定性”，短夹杂物（如纤维）加固土体在岩土工程中得到了广泛的应用。由于缺乏充分的证据证明其有效性，并且由于目前缺乏预测纤维增强土壤特性（特别是强度）的能力，因此该技术并未常规使用。建议对这种复合材料的行为进行更好的理解和定量描述的研究。本研究的目标是：(a)更好地理解纤维增强机制，(b)对这种复合材料（模型）进行合理（在设计中有用）的定量描述，(c)收集实验证据以验证建模工作，以及(d)对纤维增强结构进行合理分析。理论研究的重点将放在微观力学和均质化上，实验室测试将用于验证所开发的模型。微观力学研究将包括土壤-纤维的相互作用和单个纤维对基体变形的响应。均质化将包括描述纤维增强土的宏观行为，这是将单纤维细胞行为扩展到纤维以任意方式分布的复合系统的结果。本研究的意义在于对纤维增强土进行合理的描述，从而为纤维增强土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.