【摘要】 橡胶作为一种高弹性、密度低、高耐久性的材料，在土木工程领域得到广泛运用。开展饱和橡胶纤维加筋土的固结直剪试验，研究橡胶纤维含量为0%、5%、7%、10%、15%的剪切应力-剪切位移响应。试验结果表明：（1）在膨胀土中掺入橡胶纤维可以显著降低土体固结时的竖向位移。（2）ESR一般在剪切位移为2 mm处取得抗剪强度峰值，随着橡胶纤维含量增加，ESR由应变软化转化为应变硬化。（3）橡胶纤维能显著提高膨胀土的黏聚力，但内摩擦角变化并不明显。（4）引入应力比Rτ_ult参数来描述抗剪强度与纤维掺量、垂直压力之间的关系，发现纤维可改善加筋土的剪切强度。更多还原

【Abstract】 Rubber is widely used in civil engineering as a material with high elasticity, low density and high durability. In this study, the shear stress-displacement response of the saturated rubber fiber reinforced soil with vertical stress of 50, 100, 200 and 400 kPa and rubber fiber content of 0%, 5%, 7%, 10% and 15% was studied. The test results show that:(1) rubber fiber reinforced expansive soil can significantly reduce the vertical displacement during soil consolidation.(2) ESR generally achieves peak shear strength at a shear displacement of 2 mm and converts from strain softening to strain hardening as the rubber fiber content increases.(3) Rubber fiber can significantly increase the cohesion of expansive soil, but the change of internal friction angle is not obvious.(4) The stress ratio Rτult parameter was introduced to describe the relationship between shear strength and fiber content and vertical stress, and it was found that fibers can improve the shear strength of reinforced soil.更多还原