沿海滩涂地区路堤分级填筑施工稳定控制

Stability Control of Embankment Staged Filling Construction in the Coastal Tidal Flat

福建省霞浦县某二级公路位于含水量高、压缩性高及承载力低的沿海滩涂超软土地区,工程中运用塑料排水板联合分级堆载预压法进行软基处理。通过现场监测数据,开展了对该路段桥头路堤分级填筑施工的稳定性研究。基于Asaoka沉降预测法,计算每级荷载下地基的最终沉降量,结合地基标准沉降时间前后侧向水平位移速率,综合掌握分级填筑下软基的稳定状况和沉降固结发展趋势,进而将信息反馈到施工中。工程实例中每级荷载在标准沉降时刻的实测沉降量均大于地基预估的最终沉降量,并且侧向水平位移速率均满足规范稳定要求,预测评判效果较好,具有一定的工程使用价值。

A secondary highway in Xia pu, Fu Jian is located in the coastal tidal flatwith high water content, high compressibility and low bearing capacity, and the soft foundation treatment is carried out by usingprefabricated vertical drains （PVDs） combined with staged preloading. The stability of the bridgehead embankment staged filling construction is studied using the field monitoring data. The final ground settlement is determined based on the Asaoka settlement prediction method. Ground stability and the trend of the settlement consolidation are obtained and combined with the lateral displacement rate at the slope foot on the embankment before and after the standard settlement time, which can be used to guide the embankment construction. The case results show that the measured settlement of each stage load is higher than the predicted final settlement at the the standard settlement time, and the lateral displacement rate meet the requirements of the stability in the specification, the prediction effect is better, and it has certain engineering using value.