深厚饱和吹填粉土地基加固方法及效果研究

Study on Reinforcement of Deep Saturated Dredger Silt Foundation and the Effect

结合杭州湾某市政道路刚刚吹填完成的饱和粉土地基的加固工程,基于深厚吹填饱和粉土的工程特性,对高真空击密法的适用性和有效性进行了现场研究,对施工过程中的地下水位、地面沉降、超孔隙水压力进行了实时监测和分析,并对加固后的含水率、静力触探和地基承载力进行了效果检测。结果表明:采用高真空击密法可有效加固吹填饱和粉土地基,大幅提高力学性能,效果显著,该方法为我国沿海地区类似吹填土地基的加固问题提供了新的途径和设计依据。

Combined with the saturated silt foundation reinforcement project completed by hydraulic reclamation in Hangzhou Bay, and based on the specific characteristics of the deep saturated dredger silt soil, the feasibility and validity of the high vacuum densification method （HVDM） is investigated in the field. The groundwater level, ground settlement and excess pore pressure during the construction is monitored and analyzed at real time; and the water ratio, CPT and the bearing capability after the reinforcement have also been inspected. The results show that HVDM can effectively strengthen saturated dredger silt foundation and significantly improve the mechanical properties thereof, thus provide a new practical way and design basis for similar projects in offshore areas in China.