PHC桩-网复合地基的变形影响因素分析

Analysis of Influence Factors of PHC Pile-net Foundation

通过ABAQUS大型有限元软件，对半幅路基采用二维平面应变模型进行数值分析。通过改变路堤填土高度、桩长、桩间距等参数，分析路面沉降、不同深度处的堤脚侧移，从而得出路堤高度越大、土体渗透系数越大，路基表面沉降、同一深度处的路堤侧移越大；桩长越长、桩间距sa越小、加筋砂垫层厚度越大、持力层的压缩模量越大，路基表面沉降、同一深度处的路堤侧移越小的结论。

Through ABAQUS software, two dimensional plane strain model is used to analyze the haif-amplitude roadbed. The variations of vertical displacement of fill surface, side displacement of levee toe are investigated in relation to the varying fill height, pile length, distance of two piles ere; leading to the conclusion that of the higher the fill height is, the larger the penetration coefficient of the soils, vertical displacement of fill surface and side displacement of levee toe are; as well, the larger the pile length and the less the distance of piles are, the thicker the reinforcement sand cushion is, the more the modulus of compression in supporting course is and with the vertical displacement of fill surface, the side displacement of levee toe becomes insignificant.