地面超载对土钉墙工作性能影响的有限元分析

为了揭示土钉墙在地面超载作用下的受力和变形规律,采用有限元方法,建立了整体三维有限元模型,模拟了某深基坑土钉支护的施工过程,分析了地面超载对开挖面水平位移、坑后地面沉降、坑底隆起以及土钉轴力的影响.结果表明:随着地面超载的增加,开挖面的水平位移、坑后地面沉降均近似呈线性增加,地面超载对坑底隆起的影响较小,地面超载对上部各排土钉轴力的影响要大于下部各排.

Finite Element Analysis of Influence of the Ground Overload on Working Performance of Soil Nailed Wall

In order to reveal the rules of the stress and deformation of the soil nailed wall under the action of ground overload,the construction process of excavation and supporting of the soil nailed wall for deep foundation excavation was simulated through establishing a whole three-dimensional finite element model on the basis of the finite element method. The influence of the horizontal displacement of excavation face,the subsidence displacement of the ground beside the foundation pit,the bottom heave displacement and the axial forces of soil nails on different ground overload were analysized. The results showed that with the increase of the ground overload,the horizontal displacement of excavation face,the subsidence displacement of the ground beside the foundation pit were increased approximately linearly,the ground overload had little effect on the bottom heave displacement,the effect of ground overload on the upper the axial forces of soil nails was larger than that of the lower.