基于边界面本构模型的高铁路基沉降计算

Subgrade settlement calculation of high-speed railway based on bounding surface constitutive model

通过轨道—路基—土体的ABAQUS三维数值模型的建立,分析了高铁动荷载引起的土体沉降规律,结果表明:轨道板顶部位移时程曲线形状与列车轮轨分布基本一致,路基沉降随着深度的增加逐渐减小;随着列车速度的增大,由动荷载引起的沉降逐渐减小,但车速对沉降值的影响较小。

A three-dimensional numerical model for track-embankment-ground interaction under moving train loads is built to study the settlement of high-speed railway. The results show that shapes of the time-displacement curves at the top of track slab are basically in accordance with the wheel-rail distribution of trains,and uplifting phenomena appears at certain depth of the soil. Subgrade settlement caused by dynamic loads decreases with the increase of train speed,but the train speed has little influence on the settlement value.