Consolidation Calculating Method of Soft Ground Improved by DJM-PVD Combined Method

摘要

Dry Jet Mixed (DJM) and Prefabricated Vertical Drains (PVD) have been combined to improve soft ground in Huai-yan highway in China. A simplified calculating method of the ground improved by DJM-PVD combined method is proposed based on the assumption that the soil-cement columns are impermeable. The consolidation behavior of ground improved by the DJM-PVD combined method is compared with that of PVD improved ground. The results show that the stress concentration on the columns allows excess pore pressure in surrounding clay to dissipate more quickly than that of PVD improved ground. A case study is also presented for verifying the applicability of proposed method.