The present study provides an insight into the effect of recycled carpet fibre on the mechanical response of clean sand as backfill material subjected to monotonic loading and cyclic loading as well as post-liquefaction resistance of both unreinforced and carpet fibre reinforced soils. To achieve these goals, a series of multi-stage soil element tests under cyclic loading event resulting in liquefaction followed by undrained monotonic shearing without excess pore water pressure dissipation as well as a series of monotonic undrained shear test is conducted. All the specimens are isotropically consolidated under a constant effective confining stress of 100 kPa by considering the effect of cyclic stress ratio and carpet fibre content ranging from 0.25% to 0.75%. The obtained results revealed the efficiency of carpet fibre inclusion in increasing the secant shear modulus and ductility of clean sand under monotonic shearing without previous loading history. The impact of carpet fibre inclusion on the trend of cyclic excess pore water pressure generation and cyclic stiffness degradation was minimal. However, adding carpet fibre significantly improved both liquefaction and post-liquefaction resistances of clean sand. The liquefaction resistance of clean sand, at a constant 15 loading cycles, improved by 26.3% when the soil was reinforced with 0.75% recycled carpet fibre. In addition, the initial shear modulus of the liquefied specimen significantly increased by adding recycled carpet fibre.

本研究提供了对再生地毯纤维对清洁砂作为回填材料的机械响应的影响的见解，该回填材料受到单调载荷和循环载荷以及未增强和地毯纤维增强土壤的液化后阻力。为了实现这些目标，进行了一系列在循环加载事件下导致液化的多阶段土元素测试，然后进行不排水单调剪切，没有超孔隙水压力耗散，以及一系列单调不排水剪切测试。通过考虑循环应力比和地毯纤维含量范围从 0.25% 到 0.75% 的影响，所有试样在 100 kPa 的恒定有效围压下各向同性固结。获得的结果表明，在没有先前加载历史的单调剪切下，地毯纤维夹杂物在增加清洁砂​​的割线剪切模量和延展性方面的效率。地毯纤维夹杂对循环超孔隙水压力产生和循环刚度退化趋势的影响很小。然而，添加地毯纤维显着提高了清洁砂的液化和液化后阻力。当土壤用 0.75% 的再生地毯纤维加固时，干净沙子的抗液化能力在 15 个恒定载荷循环下提高了 26.3%。此外，通过添加回收地毯纤维，液化试样的初始剪切模量显着增加。地毯纤维夹杂对循环超孔隙水压力产生和循环刚度退化趋势的影响很小。然而，添加地毯纤维显着提高了清洁砂的液化和液化后阻力。当土壤用 0.75% 的再生地毯纤维加固时，干净沙子的抗液化能力在 15 个恒定载荷循环下提高了 26.3%。此外，通过添加回收地毯纤维，液化试样的初始剪切模量显着增加。地毯纤维夹杂对循环超孔隙水压力产生和循环刚度退化趋势的影响很小。然而，添加地毯纤维显着提高了清洁砂的液化和液化后阻力。当土壤用 0.75% 的再生地毯纤维加固时，干净沙子的抗液化能力在 15 个恒定载荷循环下提高了 26.3%。此外，通过添加回收地毯纤维，液化试样的初始剪切模量显着增加。在恒定的 15 个加载循环下，当土壤用 0.75% 的再生地毯纤维加固时，性能提高了 26.3%。此外，通过添加回收地毯纤维，液化试样的初始剪切模量显着增加。在恒定的 15 个加载循环下，当土壤用 0.75% 的再生地毯纤维加固时，性能提高了 26.3%。此外，通过添加回收地毯纤维，液化试样的初始剪切模量显着增加。