为了从动力学角度研究玄武岩纤维对土的加筋作用，将长为6 mm的玄武岩纤维分别按一定的质量比掺入黄土中，通过动三轴试验研究纤维含量、含水率以及固结围压对玄武岩纤维加筋土的动应力-应变关系、动弹性模量和阻尼比的影响。试验结果表明：①玄武岩纤维加筋土和无筋土的动应力-应变关系曲线可以用H-D双曲线模型拟合；②与无筋土相比，当动应变相同时玄武岩纤维加筋土的动应力增大；③提升固结围压或减小试样含水率均可增大玄武岩纤维加筋土的动弹性模量，但该模量受纤维含量的影响不明显；④可通过增加纤维含量，或在有效区间内增大含水率来增大玄武岩纤维加筋土的阻尼比。
Abstract
In order to study the dynamic constitutive characteristics of basalt fibre-reinforced loess, and analyze the reinforced mechanism from the dynamic point of view, the basalt fiber with a length of 6 mm was blended into the loess at different mass ratios. Dynamic tri-axial tests were conducted to study the effects of fiber content, moisture content and confining pressure on dynamic stress-strain relationship, dynamic elastic modulus and damping ratio of fiber loess. The test results show that:①The dynamic stress-strain relationship curves of fiber loess and unreinforced loess are strain hardening, which can be fitted by H-D hyperbolic model;②Compared with unreinforced loess, the dynamic stress of fiber loess increases with the same dynamic strain;③ Increasing the consolidation confining pressure or reducing the moisture content can increase the dynamic elastic modulus of fiber loess, but the dynamic elastic modulus is not significantly affected by the fiber content; ④The damping ratio of fiber loess can be increased by increasing the fiber content or increasing the water content in the effective interval.
关键词
玄武岩纤维加筋土 /
动应力-应变关系 /
动弹性模量 /
阻尼比 /
H-D模型
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Key words
fiber loess /
dynamic stress-strain relationship /
dynamic elastic modulus /
damping ratio /
H-D model
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