软土地基中格栅式地下连续墙桥梁基础承载研究

Study on vertical bearing behavior of geogrid diaphragm wall bridge foundation in soft soil foundation

通过建立模型,用室内竖向载荷试验对混凝土方量3种基础形式的承载机理及沉降特性进行对比。分析相近基础方量的承载力,群桩基础的控制特性和承载力小于单室墙和两室墙基础,且随着沉降量的增加,载荷差也在不断增加。通过对比桩(墙)之间的摩阻力分布,得出格栅式地下连续墙基础与群桩基础的摩阻力分布形状图。最后得出结论,软土地基中,格栅式连续墙基础优于群桩基础结构,具有提高基础承载力,减少沉降及降低混凝土用量等优点。

In this paper,the bearing mechanism and settlement characteristics of three types of foundation with similar concrete volume were compared by building models and conducting indoor vertical load tests.Through the analysis of the bearing capacity of three kinds of foundation structures in the similar foundation volume,it could be seen that the settlement control characteristics and bearing capacity of single room wall and two room wall foundation were similar,which were better than group pile foundation,and with the increase of settlement,the load difference was also increasing.By comparing the distribution of frictional resistance between piles(walls),the distribution of friction resistance between Geogrid diaphragm wall foundation and group pile foundation was obtained.Finally,it was concluded that in soft soil foundation,grid continuous wall foundation was better than group pile foundation structure,which had the advantages of improving foundation bearing capacity,reducing settlement and decreased concrete dosage.