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对无加筋和采用不同加筋材料、加筋层数下桩承式路堤的工作性状进行了三维模型试验研究,侧重分析了桩土应力比、应力折减系数、填土中竖向应力分布、地基沉降等内容。结果表明加筋材料的设置有利于荷载向桩顶的转移,可有效减小沉降,但不同加筋形式下桩承式路堤的工作性状有所不同。使用单层或双层土工布时,路堤的荷载传递机理主要是填土的土拱效应和加筋材料的拉膜效应,但拉膜效应发挥相对较晚。使用双层格栅时,加筋材料与周围砂土形成半刚性平台。单层格栅的作用介于两者之间。试验结果与常规拉膜效应设计方法的对比表明,若假设荷载只由相邻桩间的加筋材料条带承担,计算的拉力将偏大,过于保守。
Three-dimensional model tests on the working behavior of piled embankment without reinforcement and with different reinforced materials and reinforced layers are carried out. The stress-strain ratio of pile-soil, stress reduction coefficient, vertical stress distribution in fill , Foundation settlement and so on. The results show that the setting of stiffened material is favorable for the load transfer to the top of the pile, which can effectively reduce the settlement. However, the working characteristics of the pile-supported embankment are different under different reinforced forms. When using single layer or double layer geotextile, the load transfer mechanism of embankment is mainly the soil arching effect of filling soil and the pulling effect of reinforced material, but the drawing effect of membrane is relatively late. When using a double grille, the stiffened material forms a semi-rigid platform with the surrounding sand. Single-layer grid between the role of the two. The comparison of the test results with the conventional design of the drawing film effect shows that if the load is assumed to be borne by the strip of reinforcing material between adjacent piles, the calculated pulling force will be too large and too conservative.