循环荷载下桩网结构路基桩土相互作用分析

为了研究循环荷载下降雨前后无砟轨道桩网结构路基的动力特性,尤其是桩土相互作用特性,开展了4组大比例尺动力模型试验。试验结果表明:桩土差异沉降影响受加载力和降雨条件影响较大,而受加载频率影响不明显;试验时桩的中性点大致位于0.63L(L为桩长)处,且基本不受加载力、频率、降雨等外界因素影响;桩侧摩阻力在加载力、加载频率、降雨等影响下均有明显增长。

Analysis on Pile-soil Interaction of Pile-net Structure Subgrade under Cyclic Loading

In order to study the dynamic characteristics of pile-net structure subgrade for ballastless track under cyclic loading before and after rainfall,especially the behavior of pile-soil interaction,four groups of large-scale dynamic model tests were carried out.The results show that the loading force and rainfall condition have relatively large impact on the differential settlement of piles and soil,while the loading frequency has minor impact in the tests,the neutral point of the pile appears at about 0.63L(L is the pile length)and is almost not influenced by external factors,such as loading force,loading frequency and rainfall however,the pile side friction has significant increase under such impacts mentioned herein.