真空降水联合分层强夯法加固填土地基试验研究

Experiment research of layered dynamic consolidation method combined with vacuum well dewatering in dredger-filled soft foundation treatment

结合上海某软弱填土地基处理工程,针对场地地下水位高、填土渗透性相对较好、填方高度较大等特点,选用真空井点降水联合分层强夯法加固,采用深浅管结合,2层回填,每层2遍降水、2遍点夯和最后1遍满夯工艺。地基处理检测结果表明,该方法可充分利用强夯和真空强排水的优点,对回填土和原软弱填土层均具有很好的加固效果,达到了设计要求。该方法在保证工程质量和工期的前提下具有较好的经济性,可在今后类似工程的地基加固中借鉴使用。

Based on a soft fill ground treatment project in Shanghai,in view of the high underground water level,good fill permeability and larger fill height,etc. The technique of layered dynamic consolidation method combined with vacuum well dewatering was used,which adopts the combination of deep and shallow pipes,twice backfilling,twice dewatering and twice point compaction for each backfill,and a final full compaction. Foundation test results show that the method can make full use of the advantages of dynamic compaction and vacuum well dewatering and achieve favorable reinforcement effects for both backfill and original fill,and the treated ground can meet the design requirements. It proves that the method is economical and effective on the premise of guaranteeing project quality and construction period,and it can be used for reference in foundation reinforcement of similar projects in the future.