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对不同纤维加筋方案和围压的聚丙烯纤维加筋风沙土进行三轴试验,研究纤维加筋风沙土应力-应变关系和强度特性。试验表明,纤维掺入明显提高风沙土强度,且随着围压增加而提高。在试验方案内,规格化应力比和强度加筋效果系数(代表加筋材料的利用效率)均在围压为100k Pa时最大。强度加筋效果系数与纤维长度成正比,而与围压成反比。纤维掺入风沙土内摩擦角几乎不变,而粘聚力与纤维长度和纤维掺量成正比。基于以上分析提出适用于纤维加筋风沙土强度经验公式,并讨论了土颗粒与纤维之间的作用机理。
The triaxial tests of polypropylene fiber reinforced aeolian sandy soil with different fiber reinforcement schemes and confining pressures were carried out to study the stress-strain relationship and strength characteristics of fiber reinforced aeolian sandy soil. Tests showed that the fiber incorporation significantly increased the strength of aeolian sand and increased with the increase of confining pressure. Within the experimental scheme, the normalized stress ratio and the coefficient of reinforcement effect (representing the utilization efficiency of the reinforcement material) are both maximum at a confining pressure of 100 kPa. The coefficient of reinforcement effect is proportional to the fiber length and inversely proportional to the confining pressure. The internal friction angle of the fiber incorporated into aeolian sandy soil is almost unchanged, while the cohesion is proportional to the fiber length and fiber content. Based on the above analysis, an empirical formula applicable to the strength of aeolian sand with fiber reinforcement was put forward and the mechanism of action between soil particles and fibers was discussed.