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通过三维模型试验对桩承式路堤中土拱效应发挥过程进行了研究,重点分析了不同桩顶盖板尺寸、不同加筋方式下应力折减系数与差异沉降之间的关系。结果表明,土拱效应随变形的增加而发挥;加筋材料的设置减小了差异沉降,削弱了填土中的土拱效应,荷载向桩顶的传递是土拱效应和拉膜效应共同作用的结果。采用有限元法对桩间距、填土高度等未能在模型试验中考虑的关键因素进行了参数敏感性分析,总结了土拱效应发挥过程的相关规律。根据有限元计算结果、试验数据和文献中收集到的实测资料,提出用土拱效应发挥系数和归一化位移来描述土拱效应的发挥过程,建议二者之间采用双曲线方程模拟,从而在设计中体现土拱效应随位移的发展,并满足路堤填土、加筋材料和地基之间的变形协调要求。
Through three-dimensional model test, the process of soil arching effect in piled embankment is studied. The relationship between stress reduction coefficient and differential settlement of different piles roof cover is analyzed emphatically. The results show that the soil arching effect increases with the increase of the deformation. The setting of the reinforcement material reduces the differential settlement and weakens the soil arching effect in the fill. The transfer of load to the pile top is caused by the interaction between the soil arching effect and the drawing film effect the result of. The finite element method is used to analyze the parameter sensitivity of the key factors that can not be considered in the model test, such as the distance between piles and the filling height, and the related rules of soil arching effect are summed up. According to the finite element calculation results, the experimental data and the measured data collected in the literature, it is proposed to use the soil arching effect to play the coefficient and the normalized displacement to describe the process of soil arching effect. It is suggested that the hyperbolic equation be simulated between The design reflects the development of soil arching with the displacement, and meets the requirements of deformation coordination between embankment filling, reinforced materials and foundation.