高速铁路CRTS Ⅱ型板式无砟轨道结构临界荷位和最不利位置分析

Critical loading position and disadvantageous position of high-speed railway CRTS Ⅱ slab track structure

为了研究高速铁路CRTS Ⅱ型板式无砟轨道结构的临界荷位和最不利位置,以京沪高速铁路CRTS Ⅱ型板式无砟轨道结构为例,选取轨道板板底的纵向弯拉应力作为确定轨道结构临界荷位的指标,计算得到了列车轴载位于板端位置为临界荷位;计算了轴载在临界荷位时的钢轨竖向位移、轨道板板底水平拉应力、CA砂浆层竖向压应力、底座(或支承层)板底水平拉应力,分析了车辆荷载在不同位置处的无砟轨道结构产生的应力大小,得出路基和桥梁上CRTS Ⅱ型无砟轨道结构的最不利位置。

The longitudinal bending tensile stress at the bottom of track slab is selected as index of CRTS Ⅱ ballastless track structure(BTS) to determine the end slab as critical loading position. The most disadvantageous positions of ballastless track structure are then got through analyzing tensile stress at the bottom of track slab, vertical compressive stress of CA mortar layer and the horizontal tensile stress at the bottom base(or supporting layer) plate when load at critical loading position.