摘要
通过16组综合试验研究了水泥和黄麻纤维复合材料对弱膨胀土力学特性的影响。试验的目的是分析无侧限抗压强度和抗剪强度。结果表明：（1）随着改性材料含量的增加，改性土的应力应变曲线逐渐变陡，峰值更为明显。在相同应变条件下，应力变化相应增大。应力达到最大值后，突然出现脆性轴压破坏现象。(2)随着水泥掺量的增加,改性膨胀土的无侧限抗压强度和抗剪强度逐渐增大,当水泥掺量为8%时达到最高抗剪强度。随着黄麻纤维含量的增加，改性膨胀土的无侧限抗压强度和抗剪强度先增大后减小，当黄麻纤维含量为0.5%时达到最大值。(3)改性膨胀土的黏聚力随水泥掺量的增加而增加。当水泥掺量为8%时，土样粘聚力高达298.29 kPa。改性膨胀土的黏聚力随纤维含量的增加先增大后减小。当黄麻纤维含量为0.5%时，粘聚力达到最大值。(4)改性膨胀土的内摩擦角随水泥掺量的增加而增大。水泥掺量为8%时,土样内摩擦角增大2.64°。改性膨胀土的黏聚力随纤维含量的增加先增大后减小。当黄麻纤维含量为0.5%时，内摩擦角达到最大值。
Abstract
Sixteen groups of comprehensive tests were undertaken to examine the modifications in the mechanical characteristics of weak expansive soil resulting from the inclusion of a composite material comprising cement and jute fibers. The aim of the tests was to analyze the unconfined compressive strength and shear strength. The results reveal that (1) as the modified material content increased, the stress–strain curve of the modified soil progressively became steeper, with a more pronounced peak value. Under the same strain condition, the stress variation increased accordingly. After the stress reached its maximum, a sudden phenomenon of brittle axial compression failure occurred. (2) With the increase in cement content, the unconfined compressive strength and shear strength of the modified expansive soil gradually increased, reaching the highest shear strength when the cement content was 8%. With the increase in jute fiber content, the unconfined compressive strength and shear strength of modified expansive soil increased first and then decreased, reaching the highest value when the content was 0.5%. (3) The cohesion of modified expansive soil increased with the increase in cement content. When the cement content was 8%, the cohesion of the soil sample was as high as 298.29 kPa. The cohesion of modified expansive soil increased first and then decreased with the increase in fiber content. When the jute fiber content was 0.5%, the cohesion reached the maximum value. (4) The internal friction angle of the modified expansive soil increased with the increase in cement content. When the cement content was 8%, the internal friction angle of the soil sample increased by 2.64°. The cohesion of modified expansive soil increased first and then decreased with the increase in fiber content. When the jute fiber content was 0.5%, the internal friction angle reached the maximum value.
NETL
NSTL
Wiley