基于FLAC^3D的岩土边坡施工效应研究

采用FLAC3D对预应力锚索框架梁支护的岩土边坡施工过程进行数值模拟,围绕施工中坡体位移场与应力场的变化以及下级边坡施工对上部已完成的支挡结构受力影响进行研究.结果表明坡体开挖引起的松弛区呈圆弧状,且位移由临空面向坡体内逐渐减小,坡体弹性模量与其变形呈非线性递减关系;预应力锚索框架梁能有效抑制坡体变形,从坡顶到坡脚锚索轴力依次增大,故工程设计中宜对其分别设计,做到“强腰固脚”;下级边坡与上级边坡的支挡结构相互约束,共同承担滑坡推力,形成一种“联合支挡结构”.

Research on Construction Effect of Rock Soil Slope Based on FLAC3D

FLAC^3D software is used to simulate the construction process of rock soil slope and prestressed anchor and framebeam are applied to reinforce it. Changes of displacement field and stress field during the construction of the slope and influence ofthe construction of lower slope on the loading of existing upper slope are studied. The results show that relaxation zone caused bycutting slope is an arch in shape; the displacement decreases gradually from slope face inwardly, while elastic modulus decreaseswith deformation,which reflects a nonlinear relationship. Considering that prestressed anchor and frame beam can effectively pre-vent the slope deformation and the axial force from slope top to foot increases in turn, it should be designed respectively in engineer-ing and the reinforcement measures should be taken on the lower part of the slope, because the lower structure and upper structureare bound to each other and bear landslide thrust together, thus forming a united retaining structure.