To determine the mechanism and strength characteristics of solidification of silt by a permeable polyurethane grouting material, the effects of polymer content, soil moisture, and immersion time on the unconfined compressive strength (UCS) of the silt have been studied. The results showed that the permeable polymer grouting material can significantly improve the performance of silt: (1) A higher amount of polymer produced a greater strength in the solidified soil. (2) The strength of the solidified soil increased as the immersion time was increased. (3) Moisture in the soil was not conducive to improving the strength of the solidified soil. The X-ray diffraction (XRD) and energy-dispersive spectroscopy (EDS) have proven that polyurethane does not react with the silt, but they could improve the strength of the silt through physical action. Mercury intrusion porosimetry (MIP) and scanning electron microscopy (SEM) were performed to find that polymers can reduce soil porosity, and the addition of polyurethane improved the strength of the silt mainly through adhesion, wrapping, filling, and bridging.

中文翻译：

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聚氨酯固化淤泥的强度和固化机理

为了确定可渗透聚氨酯灌浆材料固结淤泥的机理和强度特性，研究了聚合物含量，土壤湿度和浸泡时间对淤泥的无侧限抗压强度（UCS）的影响。结果表明，可渗透的聚合物灌浆材料可以显着改善淤泥的性能：（1）较高含量的聚合物可在固化的土壤中产生更大的强度。（2）固化土的强度随着浸泡时间的增加而增加。（3）土壤中的水分不利于提高固化土壤的强度。X射线衍射（XRD）和能量色散光谱（EDS）已证明聚氨酯不会与淤泥反应，但是它们可以通过物理作用提高淤泥的强度。