粉喷桩-土工格栅复合地基联合加固高速公路软基机理研究

摘要

Dry jet mixing pile and geogrid composite foundation can enhance the ability to resist the vertical and horizontal deformation of embankments on soft clay foundations. Through the plane strain finite element method, changes of side diplacement of the embankment, stress ratio of pile to soil, Axial force of grid and the settlement are analyzed. The regulation of the mechanism and settlement of the pile - net composite foundationthat are concluded from that. The results indicate that dry jet mixing piles play an important role in strengthening soft foundation; and the effect of the geogrid is mainly to balance loads and dwindle differential settlements of the embankment. The form of dry jet mixing pile and geogrid composite foundation can satisfy the requirements of the highway soft foundation processing, and the conclusion can be for reference in design and construction.%粉喷桩-土工格栅复合地基使地基水平向和竖直向抵抗变形的能力得到了增强.本文利用平面应变弹塑性有限元方法,分析了路堤的侧向位移变化、桩土应力比变化、格栅的轴力变化和沉降变化,得到桩-网复合地基受力机理和地基沉降的规律.分析结果表明,粉喷桩具有较好的加固基础作用,格栅的主要作用是均衡上部荷载和减小差异沉降.采用粉喷桩联合土工格栅的复合地基形式可以满足高速公路软基处理要求,其最终结论可以为设计和施工提供参考.