Dynamic Characteristics and Reinforcement Mechanism of Silty Soil Improved by Regenerated Fiber Polymer

Abstract

Abstract The advancement of reinforcement technologies and the enhancement of dynamic stability in subgrade silty soils contribute to sustainable civil engineering practices. To achieve these objectives, this study employs fiber polymers and inorganic curing agents to optimize the mechanical properties of subgrade silty soils. Utilizing dynamic triaxial testing and Scanning Electron Microscopy (SEM), the study examines both the dynamic behavior and microstructural mechanisms of the engineered soil. The principal findings are threefold. First, optimum dynamic stability is attained when the fiber content in the modified subgrade silty soil is at 0.2%. Second, an increase in confining pressure enhances the quasi-cohesion of the fiber-reinforced soil. Lastly, cementitious materials coat the micro-particle surfaces of the enhanced soil, linking the smaller soil particles to fill interstitial spaces, thus yielding a more compact and stable soil structure and improving the dynamic behavior of the fiber-reinforced soil.