海相淤泥质黏性土加芯搅拌桩竖向承载特性室内模型试验

Indoor Model Test on Vertical Bearing Characteristics of Marine Muddy Cohesive Soil Cored Mixing Pile

加芯水泥土搅拌桩结合了搅拌桩与钢筋混凝土预制桩的优点,弥补了双方的缺点,是一种正在被广泛推广的深厚淤泥质软土复合地基处理方式。文章通过采取加芯水泥土搅拌桩单桩、复合地基竖向承载室内模型试验,研究等芯桩、短芯桩的竖向承载特性,得到单桩承载力、桩侧阻力、桩身轴力、桩土应力比的变化关系。试验结果表明,加芯水泥土搅拌桩具有更强的单桩承载力,能显著提高传统水泥土搅拌桩的承载能力。

The cored cement-soil mixing pile combines the advantages of mixing pile and reinforced concrete precast pile,and makes up for the shortcomings of both sides.It is a kind of deep muddy soft soil composite foundation treatment method that is being widely promoted.In this paper,through the indoor model test of vertical bearing capacity of single pile and composite foundation of cored cement soil mixing pile,the vertical bearing characteristics of equal core pile and short core pile are studied,and the variation relationship of single pile bearing capacity,pile side resistance,pile axial force and pile-soil stress ratio is obtained.The test results show that the cored cement-soil mixing pile has stronger bearing capacity of single pile,which can significantly improve the bearing capacity of traditional cement-soil mixing pile.