中文摘要：

针对我国大量发生的疏浚淤泥难以处理和污染环境的问题，采用生石灰和废弃粉煤灰为改良材料，通过置换试验和增加试验，研究石灰-粉煤灰改良淤泥的含水率、液塑限和无侧限抗压强度的变化规律。结果表明：改良土的含水率都会随着养护龄期的延长和材料添加量的增加而有效地降低；龄期和粉煤灰添加量对改良土的液塑限和塑性指数的影响较大；在石灰中添加粉煤灰作为辅助材料时，可以显著提高强度，在粉煤灰添加量为4倍的石灰添加量时比单独添加粉煤灰强度增长达10倍。

英文摘要：

In order to solve the abundant of dredged material difficult to treatment and environment pollu- tion problems, lime-fly ash was used as modified materials. By displacement and addition tests, changes of water content, atterberg limits and unconfined compression strength of modified dredged material were studied. Results showed that water content of modified soil decreased with the increasing of curing periods and additive materials amount; curing time and fly-ash amount significantly affected its atterberg limits; fly-ash as the auxiliary additive material, the strength of modified soil increased a lot. And when the amount of fly ash was four times of lime amount, the strength increased over 10 times. The study showed that when lime-fly ash as composite additive materials, the plasticity and the strength were evidently improved.