水泥混凝土路面板角脱空状态下最不利荷位转移规律

Metastatic Pattern of the Worst Loading Position at Slab Corner of Cement Concrete Pavement under Voidage

通过计算板角不同脱空尺寸时纵边中部与板角荷载作用下受荷点的荷载应力,分析脱空混凝土板的最不利荷位转移规律,进行水泥混凝土路面板底脱空对面板疲劳使用寿命的影响研究。研究结果表明:路面板角脱空后,随着脱空区域的增大,最大应力位置由板纵边中部逐渐向板角区域转移,当脱空尺寸Lv>0.7 m,板角脱空区与未脱空区边界(即三角形脱空区域的斜边)成为面板受力的最不利荷位,并建议脱空尺寸超过0.4 m的路面板及时进行加固处治,以防止板块断裂。

Based on the calculation of the loading stresses at both the middle of longitudinal joint and the slab comer when the void size is varied, the metastatic pattern of the worst loading position of slab under voidage is analyzed. And the effect of voidage beneath cement concrete pavement slab on the service life of the slab is also studied. The research result shows that with the enlargement of voidage, the maximum stress position transfers from the middle at longitudinal joint to the slab cor ner. The boundary of voidage area and non-void area（ that is the hypotenuse of triangle void area） becomes the worst loading position when the void size L exceeds 0. 7m. According to the research,the suggestion is given that the strengthening treatment should be taken to prevent slab fracture when the void size is larger than 0.4m.