重载铁路泥岩路基沉降数值分析

Numerical Analysis on Settlement of Mudstone Subgrade for Heavy Haul Railway

以内蒙古鄂尔多斯铁路工程为例,使用有限元分析方法建立了DK16+559断面的分析模型。计算模拟出列车以一定的速度移动过程中产生的竖向动荷载,将模拟出的列车荷载施加在路基路面上,得到路基沉降分布。结果表明:列车行驶速度在60 km/h时,路基最大沉降量为4.74×10-3m,发生在路基表面,沉降沿竖向和水平方向逐渐减小,在深度为7.5 m处沉降趋于零;在相同行驶速度下,沉降随着深度的增加逐渐减小;随着列车行驶速度的逐渐增大,路基土体沉降的均值基本没有增大,但是变化幅值越来越大。

Taking railway engineering in Erdos, Inner Mongolia as an example, finite element analysis was used to establish an analytical model for the Section DK16 ＋ 559 therein. Thus a vertical dynamic load produced in the course of train moving at certain speed was imitated by calculation, then this load was applied to the pavement, so that distribution of the subgrade settlement was obtained. The result shows that, when train runs at the speed of 60 km/h, the maximum subgrade settlement is 4. 74 × 10^-3 m and occurs at the surface, the settlement gradually decreases along with vertical and horizontal directions and goes to zero when the depth reaches 7.5 m; under the same running speed, the settlement graduall the depth; as increase of the running speed, average soil mass settlement of increment, but the range of the settlement change is growing. th increase of basically no