基于FLAC3D的桩网复合地基路堤施工变形模拟分析

为研究软土地基路堤施工时路基的变形特性,以九江绕城高速公路A1标段经桩网复合结构处理的深厚软基试验段为研究对象,运用有限差分软件FLAC3D对此进行模拟分析。计算结果表明:路基表面与桩体沉降随距路基中心距离增大而减小,路基表面水平位移随距路基中心距离增大而先增大后减小;最大水平位移位置随填土高度的增加向路基中心方向偏移,填筑结束时在距坡脚3 m处附近;桩网复合地基能较显著控制路堤填筑时路基变形情况。

Simulation Analysis on Deformation in Embankment Construction of Pile-net Composite Foundation Based on FLAC3D

To study the deformation characteristics of soft foundation in embankment construction,this paper,taking the test section with deep soft foundation treated by pile-net composite structure in Section A1 of Jiujiang Ring Expressway as the research object,carried out the simulation analysis with the finite difference software FLAC3D.The calculation results show that,as the distance away from the subgrade center increases,the settlement of both the subgrade surface and the pile body decreases,and the horizontal displacement of the subgrade surface increases first and then decreases the position of the maximum horizontal displacement moves toward the direction of the subgrade center with the increase of filling height,and is near 3 m away from the slope toe by the end of the filling the pile-net composite foundation can control the subgrade deformation during embankment filling to a significant extent.