钉形搅拌桩加固海相沉积软土地基效果研究

The effect research on using nail type mixing pile to reinforce marine sediment soft soil foundation

在现场试验的基础上,通过三维数值模拟,对比分析常规水泥搅拌桩(简称常规桩)和不同设计参数的钉形双向水泥搅拌桩(简称钉形桩)对海相沉积软土地基的加固效果与经济效益。结果表明:钉形桩复合地基相对于常规桩复合地基,其工后沉降明显减少,极限承载力显著增大,单位处理面积的水泥用量随着钉形桩设计参数的不同有不同程度的减少。钉形桩加固效果随着扩大头高度H、扩大头直径D及桩间距S的变化而变化;H,D和S存在最佳设计值。

On the basis of field experiment,through the three-dimension numerical simulation,this paper comparative analyzed the reinforcement effects and economic benefits of conventional cement mixing pile（referred to conventional pile） and T-shaped bidirectional cement mixing pile with different design parameters（referred to T-shaped pile） to marine sedimentation soft soil foundation.The results showed that： compared to conventional pile composite foundation,the T-shaped pile composite foundation post-construction settlement was significantly reduced,the ultimate bearing capacity increased significantly,the cement dosages of unit processing area dad reduced with T-shaped pile design parameters.The T-shaped pile reinforcement effect was changed with enlarged head height H,enlarged diameter D and piles spacing S,H and the D and S had optimum design value.