堆载预压下海相吹填淤泥和天然沉积淤泥的变形及结构性对比

Comparison of Deformation and Structural Properties of Marine Dredged Silt and Natural Sedimentary Silt under Surcharge Preloading

为了更深入地理解海相吹填淤泥和天然沉积淤泥在堆载预压下的变形和结构性强度变化,该文结合堆载预压实际工程,通过现场和室内试验,研究了吹填淤泥和天然沉积淤泥的压缩量、物理性能指标和结构性强度变化。结果表明:分层压缩量随深度增加逐渐降低,吹填淤泥的压缩量远高于天然沉积淤泥;堆载处理后吹填淤泥和天然沉积淤泥的灵敏度较堆载处理前均有所升高,天然沉积淤泥的灵敏度高于吹填淤泥的灵敏度,说明淤泥的结构性强度增长速率与其堆载压力和物理状态均有关。

In order to further understand the change of deformation and structural properties between marine dredged silt and natural sedimentary silt under surcharge preloading,combining with the practical engineering of surcharge preloading,through field and laboratory tests,the compression volume,physical performance index and structural strength change of dredged silt and natural sedimentary silt are studied in this paper.The results show that the layered compression decreases gradually with the increase of depth,and the compression of dredged silt is much higher than that of natural sedimentary silt.The sensitivity of dredged silt and natural sedimentary silt after surcharge treatment is higher than before,and the sensitivity of natural sedimentary silt is higher than dredged silt,it shows that the growth rate of silt structural strength is related with its surcharge pressure and physical state.