路基差异沉降处治方案的对比研究

在高速公路的路基拓宽过程中，新路基的荷载以及工后通车的荷载都会对老路基与新路基造成严重的不均匀沉降，并且路基拓宽工程中新老路基的相互作用会产生工后沉降，对行车安全造成不良影响。对此，以某高速公路拓宽路基为例，运用ABAQUS有限元软件对路基拓宽工程中典型的不同路基差异沉降处治方式的作用效果与未处治拓宽路基工程，进行对比分析，从而得到了土工格栅与水泥土桩控制路基沉降的变化规律。数值分析表明:土工格栅对控制拓宽路基不均匀沉降控制有限，而桩基础有较好的治理效果。

Comparative Study on Treatment Schemes for Differential Settlement of Subgrade

In the process of highway subgrade widening, the loads of new subgrade and caused by post-construction transport service may give rise to serious uneven settlement of the old and new subgrade; moreover, the interaction of the old and new subgrade may bring about post-construction settlement, leading to adverse effect on the driving thereon. Therefore, taking a widened highway subgrade as an example, the typical treatment methods for the differential settlement of the old and new subgrade were studied with ABAQUS, a FEM software, and then compared with the widened subgrade that was untreated, thus the change law of subgrade settlement controlled by geo-grid and cement-soil piles was concluded. The result of numerical analysis shows that geo-grid has limit effect on control of uneven settlement of widened subgrade, while pile foundation has good effect.