高含水率淤泥具有高流动性的特点，利用废纸纤维的吸水性可快速降低淤泥流动性，方便淤泥运输和周转。为探讨废纸纤维对高含水率淤泥固化土流动性和力学性能的影响规律，开展了流动值试验、无侧限抗压强度试验、扫描电子显微镜和低场核磁共振试验。研究结果表明：掺入废纸纤维可使高含水率淤泥固化土的流动性降低60~70 mm；掺入废纸纤维对固化淤泥无侧限抗压强度的影响较小，但能够显著提升固化淤泥的韧性，其残余强度和破坏应变能提高2~4倍；废纸纤维对固化淤泥的韧性提升幅度随着固化剂掺量的增加而减小，其破坏应变随无侧限抗压强度的增大呈指数衰减；废纸纤维吸水膨胀后对孔隙有填充作用，使得固化淤泥中0.1~1 μm的中孔隙体积分数减小，0.01~0.1 μm的小孔隙体积分数增加，但随着废纸纤维掺量的增加，小孔隙体积分数反而会有所减小；无侧限抗压强度随小孔隙体积分数的增大而增大，两者之间呈较好的线性关系。

High-water-content sludge is characterized by high fluidity. The water absorption capacity of waste paper fibers was employed to rapidly reduce the sludge's fluidity, thereby facilitating its transportation and handling. To investigate the effects of waste paper fibers on the fluidity and mechanical properties of solidified high-water-content sludge, flow value tests, UCS (unconfined compressive strength) tests, SEM (scanning electron microscopy), and LF-NMR (low-field nuclear magnetic resonance) tests were conducte. The results indicate that the incorporation of waste paper fibers reduces the flow value of the solidified sludge by 60 ~ 70 mm. The addition of waste paper fibers has a minimal effect on the UCS, but it significantly enhances the toughness of the solidified sludge, with its residual strength and failure strain increasing by 2 ~ 4 times. The improvement in toughness provided by the waste paper fibers decreases as the amount of curing agent increases, and the failure strain exhibits an exponential decay with increasing unconfined compressive strength. The water absorption and swelling of the waste paper fibers facilitate pore filling, reducing the volume fraction of medium pores and increasing the volume fraction of small pores in the solidified sludge. However, with the increase in waste paper fiber content, the volume fraction of small pores decreases. Additionally, a strong linear correlation exists between UCS and small-pore volume fraction.