采用综合处治措施解决软基工后沉降引起路基路面病害

京珠高速广珠北K22+900～K23+120段基底分布厚度13～20m的软土,具有典型珠江三角洲地区淤泥特性。施工时采用袋装砂井进行等载预压,路堤为吹填砂和包边土组成,高度4.6～6.0m。通车后路基出现下沉、开裂病害,通过工后监测数据,该路段土体水平位移较大,路基稳定性存在隐患。通过路基稳定性处治、路面裂缝注浆处治和路面裂缝处治后,路基已稳定,裂缝已基本灌满,路面行车畅顺。

Comprehensive Treatment Measures against Pavement Diseases Caused by Soft Settlement

13.0 - 20m thick soft soil has been located within the North of GuangZhu section（K22 ＋900-K23 ＋120） of The Beijing-Zhuhai Expressway,with typical silt characteristics of the Pearl River Delta region.When Construction,the roadbed has been preloaded with sand bags,and constructed by hydraulic fill sand and surrounding soil with a height of 4.6 - 6.0m.After being open to traffic,settlement and cracking appears,and it has been found that there is quite serious lateral displacement by the monitoring data,so the subgrade stability has become a question.After embankment stability treatment,grouting for pavement cracks and pavement cracking treatment,the embankment is stable,cracks has been basically filled,and the road traffic is smooth.