复合土钉墙变形性能的三维弹塑性ADINA有限元分析

Three-Dimensional Elastc-Plastic ADINA Finite Element Analysis of Deformation of Composite Soil Nailed Wall

运用大型非线性有限元软件ADINA,模拟某深基坑土钉+水泥土搅拌桩复合土钉墙基坑开挖与支护的施工过程,建立了整体三维有限元模型,模型考虑了基坑的整体空间作用,克服了二维平面或局部的三维有限元模型分析的不足.分别得出了基坑的整体位移、开挖面的水平位移、坑后地面沉降的位移、坑底隆起的位移,并与现场实测值进行了对比.结果表明,计算值与实测值基本吻合,说明建立的非线性有限元计算模型和分析方法是可靠的,能够较好地运用于实际工程的分析和预测.

Based on the nonlinear finite element software ADINA, the construction process of excavation and supporting of the composite soil nailed wall of soil nailing and cement-soil piles for deep foundation excavation is simulated by a whole three-dimensional finite element model. Spatial action of foundation pit was considered in the model. The deficiencies of two-dimensional plane model or a partial spatial one were overcomed. Whole displacement of foundation, the horizontal displacement of excavation face, the subsidence displacement of the ground beside the foundation pit and the bottom heave displacement are obtained, which were compared with the actual measured data. The results show that the finite element analytical results are in agreemennt with those of the field test data. The good agreement shows that the finite element model and analytical method are reliable. The results can satisfy the need of engineering and can be well applied to analyze and predict practical engineering.