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运用ABAQUS有限元软件建立桩网支承路基三维模型,分析桩间距、桩帽尺寸、软土层模量、下卧层模量和格栅模量等关键参数对桩网支承路基沉降、桩土应力、垫层上方应力、加筋网垫承担的应力、桩土荷载和格栅拉力等的影响。结果表明,桩土差异沉降受软土层模量影响最大,路基存在明显的应力集中即“土拱”效应,加筋网垫承担的竖向应力随下卧层模量、软土层模量和置换率的增大而减小,随格栅模量的增大而增大,两桩帽间格栅竖向变形近似呈悬索形状,上层格栅受到的拉力约为下层的0.4倍。
ABAQUS finite element software is used to build the three-dimensional model of pile-supported embankment. The key parameters of pile spacing, pile cap size, modulus of soft soil, modulus of underlayer and modulus of grille are analyzed. , The stress above the cushion, the stress borne by the reinforced mat, the load of the soil and the tensile force of the grating. The results show that the differential settlement of pile-soil is affected most by the modulus of soft soil, and the stress concentration of the subgrade is “soil-arch” effect. The vertical stress of the reinforced mat depends on the modulus of bedding layer, Modulus and replacement rate increases with the increase of the grid modulus increases, vertical deformation of the two cap cape is approximately suspended cable shape, the upper grid by the pull of about 0.4 Times