Tn-Situ Test Research on Vacuum Dynamic Consolidation Method to Improve Double-Layered Soft Ground

摘要

A new technique named vacuum dynamic consolidation method (VDCM) to improve double-layered soft ground is presented on the basis of a harbor construction project in Shanghai. By analyzing the variation of underground water table and soil water content in shallow ground, the roles of vacuum well dewatering are investigated. The increasing and dissipation regularities of excess pore water pressure during and after dynamic compaction are also monitored. The underlying improvement mechanism of VDCM is analyzed and the method to choose the optimal construction parameters is proposed. The results of field detective tests verify the validity of VDCM to improve double-layered soft ground. This study provides an effective and economic improvement method, which can be widely used in harbors or other coastal engineering constructions.