强夯法处理双层软弱地基试验区监测与检测浅析

Analysis of monitoring and testing in the test area of double-layer soft ground treatment with dynamic compaction

“双层软弱地基”地层结构常见于江海湖湾地区,一般地表为3~5 m厚的水力冲填土,以松散、不均匀的粉土、粉砂为主,其下为孔隙比大、压缩性高、强度低的淤泥质土。大面积处理“双层软弱地基”常采用降水联合低能级强夯法,本文以江苏南通通州湾江海联动开发示范区建设制造基地项目为例,详细介绍了强夯法试验概况,对监测与检测成果进行了分析,结合工程实践提出了几种新的地基处理思路,可供同类项目参考。

The stratigraphic structure of“double-layer soft ground”is commonly encountered in the riverside,lakeside or gulf area.Typically,there exists a 3-5 m thick layer of hydraulic dredger fill on the surface,comprising primarily loose and uneven silt and silty sand.Beneath this layer,there is a layer of mucky soil characterized by a significant void ratio,high compressibility and low strength.Large-scale treatments for“double-layer soft ground”often employ a combination of dewatering and low-energy dynamic compaction.This work utilizes the construction and manufacturing base project in the Tongzhou Bay River-Sea Linkage Development Demonstration Zone,located in Nantong,Jiangsu,as a case study.This work provides a comprehensive analysis of dynamic compaction testing and the subsequent evaluation of monitoring and testing results.Additionally,the work introduces innovative foundation treatment strategies derived from engineering practice.These strategies offer valuable guidance for similar projects.