门架式双排桩围护结构的三维有限元分析

3D finite element analysis of portal double row piles

门架式双排桩支护结构是由前排桩、后排桩及桩顶冠梁共同作用的空间组合围护结构,这种围护结构主要是发挥组合桩的整体刚度和空间效应及桩土的协同作用,其三维空间效应显著。通过有限元软件ABAQUS对该种围护结构进行三维有限元分析,从而分析门架式双排桩围护结构的内力和变形以及与土的相互作用机理,并将数值计算结果与实测结果进行对比,验证理论计算与分析的合理性,并得出冠梁厚度增加到0.6m后,冠梁厚度对前后排桩的弯矩和位移的影响不再明显的结论。

The portal double row piles is a kind of composite retaining structure, which is composed of front pile, back pile and top beam. This kind of retaining structure not only has significantly three- dimension space effect, but also plays a major role through the integral rigidity and spatial effect of composite piles, and the synergistic effects of soil and piles. Through the three-dimensional finite element analysis based on ABAQUS software, the deformation and internal force of support structure and the interaction mechanism between the soil and piles are revealed, and the rationality of the theoretical calculation and analysis are proved, and from the analysis, it is concluded that when the thickness of top beam is more than 0.6 m, the displacement and moment of the front and back piles influenced by the thickness of top beam is no longer significant.