考虑超载比和预固结荷载的吹填软土次固结特性试验研究

Experimental Study on Secondary Consolidation Characteristics of Dredger Fill Soft Soil Considering Overload Ratio and Preconsolidation Load

吹填软土具有明显的次固结特性,对地基处理的工后沉降具有重要影响,为明确吹填软土次固结特性及影响因素,该文通过对汕头吹填淤泥进行一维固结试验,分析其吹填软土主、次固结变形特性,并从卸载再压缩、预固结荷载、超载比等方面对次固结系数的影响进行了分析。结果表明:吹填软土主固结系数与固结压力呈指数函数的关系,次固结比和回弹次固结比均随超载比(卸荷回弹比)增大而增大,随预固结压力增大而减小,其与超载比和预固结荷载呈双指数函数关系。

The dredger fill soft soil has obvious secondary consolidation characteristic,it has important influence on the settlement after foundation treatment. In order to clarify the characteristics and influencing factors of secondary consolidation of dredger fill soft soil,in this paper,the one-dimensional consolidation test is carried out on Shantou blown silt to analyze the deformation characteristics of primary and secondary consolidation of dredger fill soft soil,and the influence of secondary consolidation coefficient on unloading and recompression,preconsolidation load,overload ratio and other aspects is analyzed. The results show that the main consolidation coefficient of dredger fill soft soil shows an exponential function relationship with the consolidation pressure. The secondary consolidation ratio and rebound secondary consolidation ratio both increase with the increase of the overload ratio (unloading rebound ratio) and decrease with the increase of preconsolidation pressure. And the relationship between them and the overload ratio and preconsolidation load shows a double exponential function。