基于SEM测试的玄武岩纤维加筋黄土作用机制研究

Study on the Action Mechanism of Basalt Fiber Reinforced Loess Based on SEM Test

摘要: 为了研究玄武岩纤维加筋黄土的作用机理，本文采用扫描电镜试验分析了玄武岩纤维在不同尺寸、掺量的因素下对加筋黄土试样在静、动荷载下微观结构的影响。结果表明：1) 当纤维含量较小时，加筋土体结构优于未加筋土。当纤维含量逐渐增加时，纤维相互交织形成三维网架结构，从而提高了加筋土的强度，最优掺量为0.8%。2) 随着纤维长度的增加，纤维与土壤接触面积增大，增强了加筋土的内聚力和摩擦力，最佳长度为16 mm。

Abstract: In order to study the action mechanism of basalt fiber reinforced loess, this paper analyzed the effects of the factors of different sizes and contents of basalt fiber on the microstructure of reinforced loess samples under static and dynamic load by Scanning Electron Microscopy (SEM). The results show that: 1) When the fiber content is small, the structure of reinforced soil is better than that of unreinforced soil. When the fiber content increases gradually, the fibers interweave with each other to form a three-dimensional mesh structure, thus improving the strength of the reinforced soil, and the optimal content is 0.8%. 2) With the increase of fiber length, the contact area between fiber and soil increases, which enhances the cohesion and friction force of reinforced soil, and the optimal length is 16 mm.