淤泥质土覆盖杂填土路基的强夯处理方法

Dynamic Compaction Treatment Method of Miscellaneous Fill Subgrade Covered with Muddy Soil

大连市普兰店区,地貌单元为海滩,软土层分布广泛,地质条件较差,若不对软土层处理,将会发生路基失稳或过量沉陷,导致道路破坏或不能正常使用。为了解决该问题,采用强夯的处理方法来加速地基的沉降。先根据地质条件拟定施工参数,通过试夯来调整适合本项目的施工参数,在试夯试验中重点对孔隙水压力、地上水位、夯坑及其周边地表变形进行观测,待试夯结束后进行荷载板试验、标准贯入来检验强夯处理后的地基承载力和密实度,最终形成地基承载力大于130kPa的"人工硬壳层",处理后的地基承载力符合工程设计的要求。

The geomorphic unit of Pulandian District in Dalian City is beach,where soft claylayer is widely distributed,and the geological conditions are poor.If the soft clay layer is not treated properly,the subgrade may lose stability or settle excessively,resulting in abnormal use or even damage of road.To solve this problem,dynamic compaction is adopted to accelerate the settlement of the subgrade.Firstly,construction parameters are proposed according to the geological conditions,the parameters are adjusted through the trial compaction.During the trial compaction,the pore water pressure,ground water level,the deformation of the compaction pit and the surrounding surface are observed.After the trial compaction,plate load plate test and SPT are carried out to check the bearing capacity and compactness of the subgrade.Finally,the‘artificial hard layer’with bearing capacity greater than130 kPa shall be formed.The treated bearing capacity of the subgrade can meet the design requirements.