新型搅拌桩加固铁路海相软土地基试验研究

针对新型搅拌桩复合地基加固海相软土的适用性问题，在铁路正线进行了应用试验。分别对新型搅拌桩施工过程中的桩土扰动和成桩质量，路基填筑期及静置期复合地基的桩土应力分布、孔隙水压力变化、沉降和变形进行了现场监测分析。结果表明:新型搅拌桩复合地基适用于苏北地区海相深厚软土加固；双向搅拌桩和双向钉形搅拌桩复合地基方案对加快地基沉降收敛和减小地基的沉降量效果显著。

Experimental Study on Railway Marine Soft Soil Foundation Reinforced by a New Type of Mixing Pile

In view of the applicability of the new type of mixing pile composite foundation to reinforce the marine soft soil, the application test is carried out on the main railway line. The field monitoring and analysis of the pile and soil disturbance and pile quality during the construction of the new type of mixing pile, and the stress distribution, pore water pressure change, settlement and deformation of the composite foundation during the subgrade filling and standing period were carried out. The results demonstrate that the new type of mixing pile composite foundation is suitable for marine deep soft soil reinforcement in northern Jiangsu area. The composite foundation scheme of bi-directional mixing pile and bi-directional nail-shaped mixing pile can significantly accelerate the foundation settlement convergence and reduce the foundation settlement.