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新吹填土含泥量大、含水率大、渗透性差、零承载力,常规地基处理工法无法开展,地基处理面临诸多困难。针对该问题,提出了复式负压固结技术,该技术包括3道工序:改性真空预压、电渗降水和强夯动力固结。改性真空预压使地基得到初步固结,具备一定强度,为后序工作做准备;电渗降水可有效降低夯前地下水位和土体含水率,并促进夯后超孔隙水压力的消散;电渗降水和强夯动力固结多遍耦合,共同对吹填土进行地基加固。现场开展了复式负压固结技术工艺试验、土性试验和沉降变形监测。结果表明,应用于吹填泥的地基处理,改性真空预压可快速提高承载力,电渗法可迅速降低地下水位,有效避免强夯时“弹簧土”现象的发生,从而提高了最佳夯击能。复式负压固结技术可以有效地应用于新吹填软土地基。
The new dredged clay contains a large amount of mud, water content, permeability is poor, zero bearing capacity, conventional foundation treatment method can not be carried out, foundation treatment is facing many difficulties. In view of this problem, proposed a composite negative pressure consolidation technology, which includes three processes: modified vacuum preloading, electro-osmosis precipitation and dynamic consolidation. Modified vacuum preloading makes the foundation get the initial consolidation, with a certain intensity, to prepare for the post-order work; electro-osmosis precipitation can effectively reduce the groundwater level before rammer and soil moisture content, and promote the dissipation of excess pore water pressure after ramming; Electro-osmosis precipitation and dynamic consolidation of strong rammer multi-pass coupling, the common ground filling of the dredging. The site carried out a double negative pressure consolidation technology test, soil test and settlement deformation monitoring. The results show that the applied vacuum preloading can improve the bearing capacity rapidly, and the electroosmosis method can reduce the groundwater level rapidly and effectively avoid the occurrence of “spring soil” during dynamic compaction, thus improving The best tamping energy. Compound negative pressure consolidation technology can be effectively applied to the newly blown soft ground.