采用泡沫聚苯乙烯修筑的轻型桥台路堤特性分析

Analysis of performance of bridge approach embankment constructed by expanded polystyrene

为了分析采用泡沫聚苯乙烯(EPS)修筑的轻型桥台路堤的特性,以广东淡澳河大桥南岸桥台施工的EPS路堤为例,阐述该桥台路堤的结构形式、施工特点以及现场监测仪器的布置情况,并对监测数据进行分析;采用固结有限元ABAQUS程序计算路堤填筑450 d后的路堤内压力和位移分布状况,讨论沿路堤中线的沉降以及沿桥台台背的竖向与侧向压力的分布情况。特性分析结果表明:虽然EPS路堤也发生沉降,但是1 a后沉降趋于稳定,而且整个EPS路堤也稳定。因此,采用EPS填筑路堤可以显著减少地基土上覆荷载、路基沉降和作用在桥台台背上的侧压力,保证桥台和路堤的稳定。

The article takes the expanded polystyrene（EPS） embankment projection of south abutment of Danao River Bridge in Guangdong for example to analyze the performance. The structure type of this bridge approaches embankment, the characteristics of construction and dis- posal of monitoring apparatus in scene were described, the monitored data were analyzed, and the distribution of pressure and displacement inside the embankment after 450 d were computed using a finite element computer program ABAQUS. And the distribution of the settlement along the middle line of the embankment and the vertical and lateral pressure along the back of the abut- ment were discussed. The results show that although the EPS embankment has settled, it tends to be stable a year later and the whole EPS embankment has been in good condition. So the EPS embankment can reduce the plus traffic loading of foundation, settlement of the embankment and the lateral pressure remarkably, maintaining the stability of the abutment and embankment.