土工格栅对在役桩承式路堤蠕变影响的研究

为了研究土工格栅在黄土地区对在役路堤蠕变变形机制的影响，利用 FLAC3D 软件及内嵌的FISH语言，对长治至安阳高速公路长平（长治—平顺）路桥过度段进行一比一数值模拟分析。通过对比实测值与模拟值，验证了模型的正确性，从而确保了模拟工后蠕变的准确性。本文通过格栅上部桩土应力比与格栅下部桩土应力比比值来分析张拉膜效应在工后蠕变中荷载传递能力的大小，通过横向差异变形率来探究格栅对减小路堤不均匀沉降的作用。研究表明：张拉膜效应和土工效应在路堤填筑过程中和工后蠕变间断二者传递荷载的特性处于动态平衡中，虽然填筑过程中，土拱效应远大于张拉膜效应，但随着工后蠕变，张拉膜效应发挥的作用逐渐增大，二者的差距逐渐缩小，直至达到新的平衡；土工格栅对减小路堤沉降和减小路堤不均匀沉降有不可替代的贡献。

Study on the Effect of Geogrid on Creep of Pile - Supported Embankment in Service

In order to study the influence of geogrid in loess area on creep deformation mechanism of posterior embankment, FLAC3D software and embedded FISH language were used to analyze the overcorrection of Changping (Changzhi - Pingshun) road and bridge over Changzhi to Anyang Expressway Simulation analysis. By comparing the measured values with the simulated values, the correctness of the model is verified, which ensures the accuracy of the postganglionic creep. In this paper, the magnitude of the load transfer capacity of the tensioning effect in the post-working creep is analyzed by the ratio of the pile-soil stress ratio of the upper part of the grid to the pile-to-pile ratio. The transverse deformation rate is used to investigate the effect of the grid- The effect of uneven settlement. The results show that although the soil arching effect is much larger than that of the tensioning process, the effect of the tensioning effect is gradually increased with the post-working creep, and the gap between the two is gradually reduced. Embankment settlement and reduce the embankment uneven settlement has a certain irreplaceable contribution.