Abstract Dredged clay is often undesirable as a foundation soil layer since it undergoes large deformation with time. In addition, the space constraint due to ever-growing population might require to utilize the dredged-fill reclaimed lands. As such, an effort has been taken in this study to characterize the deformation behavior of dredged clay. To this end, the one-dimensional incremental load oedometer tests were administered on three reconstituted dredged clays. Samples were prepared at a moisture content ranging from 0.54–1.27 times the corresponding liquid limits. To observe the effect of thixotropic aging, prepared samples were subjected to three aging periods, such as 10 days, 30 days and 90 days. At a particular moisture content, with the increase of aging period, yield stress was observed to be increased. A unique relationship was established between yield stress ratio and initial moisture content incorporating the aging time. Compression index, Cc increases linearly as the void ratio at yield stress increases. However, Cc decreases as the yield stress increases, the decrease being rapid when the yield stress is below 7.5 kPa. Secondary compression index, Cα increases as the consolidation pressure increases, reaches a peak value and decreases thereafter. At higher initial moisture content, the secondary compressibility of dredged clays increases. Irrespective of the type of the clay, the relationship between Cα and Cc is linear in the considered stress range and time. The slope of the linear relationship (Cα/Cc) is higher for thixotropically aged clays compared to the unaged ones, indicating high secondary compressibility due to thixotropic effects.

中文翻译：

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触变老化对重构疏浚粘土一次和二次压缩影响的实验研究

摘要 疏浚粘土通常不适合作为地基土层，因为它会随着时间发生较大的变形。此外，由于不断增长的人口造成的空间限制可能需要利用疏浚填海造地。因此，在这项研究中已经努力表征疏浚粘土的变形行为。为此，对三个重建的疏浚粘土进行了一维增量载荷固结仪测试。样品制备的水分含量为相应液限的 0.54-1.27 倍。为了观察触变老化的影响，制备的样品经受三个老化周期，例如10天、30天和90天。在特定的水分含量下，随着老化时间的增加，观察到屈服应力增加。结合老化时间，在屈服应力比和初始含水量之间建立了独特的关系。随着屈服应力下的空隙率增加，压缩指数 Cc 线性增加。然而，Cc 随屈服应力的增加而减小，当屈服应力低于 7.5 kPa 时，Cc 减小得很快。二次压缩指数Cα随着固结压力的增加而增加，达到峰值后下降。在较高的初始含水量下，疏浚粘土的二次可压缩性增加。无论粘土的类型如何，Cα 和 Cc 之间的关系在所考虑的应力范围和时间中都是线性的。与未老化的粘土相比，经触变老化的粘土的线性关系斜率 (Cα/Cc) 更高，