吹填砂地基强夯加固现场试验研究与应用

Field Test Research and Application on Dynamic Consolidation Method in Dredger Filled Sand Foundation

结合厦门某海湾大型吹填造地工程,系统介绍了强夯加固吹填砂地基的试验与测试方案,分析强夯加固过程中的孔压变化规律,发现强夯中孔压响应与土层渗透性密切相关,需要根据不同的土类来考虑孔压滞后效应的影响。通过强夯前后的各种原位试验成果对比研究,对强夯加固效果进行定性和定量评价,得出地基的有效加固深度和加固后承载力,确定合理的施工控制参数。结果表明,强夯后的地基承载力和变形满足设计要求,但表层土需采取相应措施予以补强。

This paper presents a field test research into dynamic consolidation method. The field test was conducted based on a large-scale land reclamation project at Xiamen bay, and the paper describes in details a test scheme of dynamic consolidation method, and the test aims to analyze the variation of pore-water pressure in the process of dynamic consolidation method. During the experiment, it was found that responses of the pore-water pressure were closely related with the permeability of soil; therefore the lagging effect of pore-water pressure should be considered according to the soil type. Further study has been conducted to compare all kinds of field test results before and after the dynamic consolidation, and the effects of using dynamic consolidation method are the evaluated through beth qualitative and quantitative ways. As a result, the effective depth of land improvement and beating capacity of the foundation are calculated and reasonable construction parameters are then obtained. The results show in the field test that the ground bearing capacity and deformation can meet the design requirements, but topsoil of the foundation should be reinforced through other measures. It is concluded that the comprehensive comparison based on field test results provides an example and knowledge for similar land reclamation projects.