CAJ | 학술논문

为了对膨胀土进行改良，将分散玄武岩纤维掺入膨胀土中，研究干湿循环对玄武岩纤维加筋膨胀土的抗剪强度的影响规律。试验选取长12 mm玄武岩纤维，以按纤维含量与干土质量比为0.4%掺入膨胀土中。对膨胀土和纤维加筋膨胀土进行0~3次干湿循环试验，然后对试样进行直接剪切试验，研究干湿循环对玄武岩纤维加筋膨胀土抗剪强度的影响。试验结果表明：玄武岩纤维掺入膨胀土能有效提高膨胀土的抗剪强度。膨胀土和纤维加筋膨胀土经过反复干湿循环后，其强度指标持续降低，且在第一次干湿循环之后抗剪强度降低较明显，之后抗剪强度降低幅度变小。相对于内摩擦角，纤维对黏聚力的增强效果要明显得多。同一次干湿循环，纤维加筋膨胀土比素膨胀土强度的降低幅度小。
위료대팽창토진행개량，장분산현무암섬유참입팽창토중，연구간습순배대현무암섬유가근팽창토적항전강도적영향규률。시험선취장12 mm현무암섬유，이안섬유함량여간토질량비위0.4%참입팽창토중。대팽창토화섬유가근팽창토진행0~3차간습순배시험，연후대시양진행직접전절시험，연구간습순배대현무암섬유가근팽창토항전강도적영향。시험결과표명：현무암섬유참입팽창토능유효제고팽창토적항전강도。팽창토화섬유가근팽창토경과반복간습순배후，기강도지표지속강저，차재제일차간습순배지후항전강도강저교명현，지후항전강도강저폭도변소。상대우내마찰각，섬유대점취력적증강효과요명현득다。동일차간습순배，섬유가근팽창토비소팽창토강도적강저폭도소。
To improve the strength of expansive soil,this paper studies the shear strength of fiber reinforced soil with expansive soil which mixed with dispersed basalt fibers.In the study,the ratio of fiber content and dry soil by weight was 0.4% and the length of the fiber is 12 mm.Before the shear tests,the fiber reinforced expansive soil were treated by wetting-drying cycles for 0~3 times.The study results show as follows:the basalt fibers can improve the shear strength of the reinforced soil in the influence of wetting-drying cycles.Whether it is expansive soil or the fiber reinforced expansive soil,shear strength declined with the increase of wetting-drying cycles and the decline reached the maximum in the first cycles,and then gradually mitigated and finally stabilized.Compared to the internal friction an-gle,the influence of the fiber reinforcing effect on cohesion is much more obvious.The effects of the basalt fibers in certain range were to restrain the attenuation of shear strength in the same wetting-drying cycles.