基于土拱效应的桩承式路堤承载变形计算研究

从桩土差异沉降、土拱效应、荷载分配三者的关系出发,提出桩体向上刺入路堤的体积等于土拱区体积的压缩量的假设,通过对桩承式路堤进行力学分析,并结合其变形协调特性,推导出用差异沉降表示的桩土应力比以及拱高的计算公式.采用模型试验和数值模拟结果对该方法进行了验证,并分析了桩土面积置换率、填土高度、填土内摩擦角对桩土应力比以及拱高的影响.结果表明了该方法所求得结果与实测值较为接近,验证了其合理性.

Researches on Bearing Mechanism and Deformation of Pile-supported Embankments Based on Soil Arch Effect

Based on the relationships of the differential settlement of piles and soil, soil arch effect and load distribution, an assumption that the volume of pile into the embankment is equal to the compression amount of the soil arch volume was firstly put forward. Combined with the mechanical analysis of pile-supported embankment and the deformation equilibrium of piles and soil, the formula between the pile-soil stress ratio and the soil arch height with differential settlement was derived. Finally, comparative model test and numerical analysis were performed to check the validity of this method. The proposed method was also used for a parametric study in order to investigate the effects of various parameters such as replacement ratio of pile and soli area, embankment height, and friction angle of the soil on the behavior of the pile-soil stress ratio and soil arch height. The result turned to be in good agreement with the measured values, which verifies the rationality of the proposed method.