无砂垫层真空预压在吹填淤泥软基处理中的效果分析

Analysis of Consolidation Effect of Vacuum Preloading Consolidation Without Conventional Top Sand Drainage Cushion on Newly Dreged Silt

新吹填淤泥具有超软、超含水率等不利的工程特性,使得其对后期的地基处理提出了很高的要求。结合某新吹填淤泥工程,对取消排水垫层后的浅层地基处理进行了现场试验研究。同时采用数值模拟方法、理论和规范方法对该现场试验后的承载力进行分析和探讨。结果表明,在取消排水垫层后,采用浅层处理方法对新吹填淤泥进行处理,可使处理深度范围内的吹填淤泥强度得到明显增长。

The newly dredged silt has disadvantageous engineering properties of ultra-soft character and excess water content. It results in high requirements for post soft-ground treatment. For a future industry site filled with newly dredged silt, vacuum preloading consolidation method without drainage cushion was performed to improve the ground bearing capacity and reduce the post-construction settlement. Various approaches have been employed to investigate the ground bearing capacity af- ter the treatment, including field testing, theoretical method and empirical methods from different design codes. The test re- sults show vacuum preloading consolidation could increase the shearstrength of the newly dredged silt to a certain depth even without the conventional sand drainage cushion. The water content decreases substantially and the bearing capacity increases. Crust will be formed in short time on the surface of the newly dredged silt.