井点降水联合强夯法加固饱和淤泥质地基的试验研究

EXPERIMENTAL RESEARCH ON SATURATED MUCKY FOUNDATION TREATMENT WITH WELL-POINT DEWATERING COMBINED WITH DYNAMIC COMPACTION METHOD

针对传统强夯法不适用于高地下水位条件下加固饱和淤泥质黏土地基的不足,提出井点降水联合强夯新型静–动力排水固结技术与施工工艺,并结合广州港南沙港区粮食及通用码头工程软基处理试验区科研项目,通过对地下水位、孔隙水压力和表层沉降等实施现场监测及室内土工试验,分析其加固机制,进而验证施工参数。地基处理后,经静力触探试验、十字板剪切试验、标准贯入试验和静载荷板试验检测,证明加固效果显著,比贯入阻力提高200～300 kPa,标贯击数增加2击,地基承载力达130 kPa。研究工作为今后软基处理工程提供一种新的方法和思路。

Aiming at the insufficiency of traditional dynamic compaction method to saturated mucky with a high groundwater level, a new static-dynamic drainage consolidation technique; well-point dewatering combined with dynamic compaction method（WDDC） is developed. WDDC has been applied to Guangzhou Nansha harbor grain and universal terminal project soft foundation improvement test area research project where the in-situ monitoring （groundwater level, pore water pressure and settlement） and geotechnical laboratory tests are conducted to investigate the mechanism and qualification of WDDC. The ground treatment effect is confirmed by static cone penetration test, vane shear test, standard penetration test and Static loading test. The specific penetration resistance can increase 200 to 300 kPa while the standard penetration test can be added 2 blows. The bearing capacity of foundation can reach 130 kPa. WDDC is an efficient soft foundation treatment method and the tests provide a new way for future industrial applications.