地面超载对土钉墙工作性能影响的有限元分析

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

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.

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 exca -vation was simulated through establishing a whole three-dimensional finite element model on the basis of the finite ele-ment 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 o -verload 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 .