关键词: 玄武岩纤维加筋黄土, 无侧限抗压强度, 应力应变, 正交设计, 极差分析, 方差分析

Abstract: In order to study the mechanical properties of reinforced loess with basalt fiber, orthogonal design was used to carry out unconfined compressive strength test. The test results were analyzed using a combination of range analysis and variance analysis to study the influence of water content, fiber content, compactness on the unconfined compressive strength of basalt fiber-reinforced loess. Furthermore, based on the analysis results, the consolidated undrained triaxial compression test was conducted to study the the effect of fiber content on shear strength index of basalt fiber loess. The study results showed that the primary and secondary factors affecting the compressive strength of the basalt fiber loess were fiber content, water content, and compactness. The optimal level combination obtained by analysis of variance was 0.4% fiber content, 11% water content, and compaction degree 0.95. The basalt fiber can effectively improve the shear strength, the cohesion increased first and then decreased with the increase of the fiber content, and the internal friction angle fluctuation range was small. The stress-strain relationship of the basalt fiber loess can generally follow the?hyperbola curve model, the b value of the fitting result decreased with increasing of the confining pressure, and increased first and then decreased with the blending amount. The critical fiber blending amount was closely related to the b value of the fitting result, and the critical interval is 0～0.2%.

Key words: reinforced loess with basalt fiber, unconfined compressive strength, stress strain, orthogonal design, range analysis, variance analysis;