半刚性-级配碎石复合基层施工技术研究

为提高半刚性碎石复合基层的稳定性,对半刚性-级配碎石复合基层在道路施工中的应用进行研究。依托实际工程,首先对所选原材料性能进行检测;然后对半刚性-级配碎石进行无侧限抗压强度试验,从水泥剂量、级配类型及龄期等方面研究其力学性能。试验得出,随着水泥剂量的增加,试件强度逐渐提高,级配类型不影响路面施工;随龄期增加,试件强度逐渐提高,但增幅逐渐减小,说明龄期增加并不能一直提高其强度,故在施工时可选用60d养护龄期。

Numerical analysis of reflective cracking and fatigue lives of semi-rigid pavement structures using ABAQUS and FE-SAFE

In order to compare the impact of thickness of different layers on fatigue lives of different semi-rigid asphalt pavement structures, the mechanical results from finite element models in ABAQUS are incorporated with the fatigue results from fatigue models in FE-SAFE to calculate the mechanical response and fatigue lives of semi-rigid pavement structures under heavy traffic loads. Then the influences on fatigue lives caused by the changes in the thickness of layers in pavement structures are also evaluated. The numerical simulation results show that the aggregated base and the large stone porous mixture （LSPM） base have better anti-cracking performance than the conventional semi-rigid base. The appropriate thickness range for the aggregated layer in the aggregated base is 15 to 18 cm. The thickness of the LSPM layer in the LSPM base is recommended to be less than 15 cm.