【摘要】 为揭示干湿循环与侵蚀耦合作用对固化淤泥性质的影响，以碱渣、矿渣、电石渣为固化剂对疏浚淤泥固化处理，开展了毛细浸润干湿循环与蒸馏水、海水、硫酸镁等侵蚀耦合作用下固化淤泥外观、无侧限抗压强度及损伤研究，探究了耦合作用规律、机理和最优固化剂掺量。结果表明：硫酸镁侵蚀与干湿循环耦合作用下试样外观破损最严重、强度降低最明显；增加矿渣掺量可提高固化淤泥耐久性，当矿渣掺量分别为20%和15%时，碱渣掺量不宜超过25%和35%;多次干湿循环与海水和硫酸镁侵蚀耦合作用导致试样随应变迅速达到损伤破坏状态；干湿循环与海水侵蚀耦合作用导致试样中生成较多钙矾石和氯化钠结晶，并随循环次数的增加氯化钠结晶增多、试样不均匀性增强、中孔和大孔数量增多；干湿循环与硫酸镁侵蚀耦合作用导致水化硅酸钙等水化产物减少，碱渣掺量过高时还形成膨胀性的二水硫酸钙析出，导致固化淤泥耐久性下降；毛细浸润干湿循环与侵蚀耦合作用对固化淤泥产生严重的宏观和微观损伤。更多还原

【Abstract】 In order to reveal the impact of the coupling effect of dry-wet cycles and erosion on the properties of solidified silt, dredged silt was solidified with soda residue, slag and carbide slag as solidifying agents. The appearance, unconfined compressive strength and damage of solidified silt were studied under the coupling effect of capillary infiltration wetting-drying cycles and erosion environments such as distilled water, seawater and magnesium sulfate, and the coupling action laws, mechanisms and optimal solidifying agent dosages were explored. The results show that the coupling effect of magnesium sulfate erosion and wetting-drying cycles results in the most serious appearance damage and the most significant reduction in strength of the specimens. Increasing the slag content can improve the durability of the solidified silt. When the slag contents are 20% and 15%, respectively, the soda residue content should not exceed 25% and 35%. The coupling effect of seawater and magnesium sulfate erosion with multiple wetting-drying cycles causes the specimens to quickly reach the damage and failure state with the increase of strain. The coupling effect of seawater erosion and wetting-drying cycles leads to the formation of more ettringite and NaCl crystals in the specimens. With the increase in the number of cycles, the NaCl crystals increase, the inhomogeneity of the specimens is enhanced, and the numbers of mesopores and macropores increase. The coupling effect of magnesium sulfate erosion and wetting-drying cycles results in the reduction of hydration products such as calcium silicate hydrate. Expansive CaSO₄·2H₂O precipitates when the soda residue content is too high, leading to a decline in the durability of solidified silt. The coupling effect of capillary infiltration wetting-drying cycles and erosion causes serious macroscopic and microscopic damages to solidified silt.更多还原