The combined drainage and reinforcement cushion (CDRC) is a newly-developed proprietary technology which aims at coastal areas short of sand

is used for horizontal drainage and reinforcement in soft ground treatment and can replace horizontal dewatering sand cushion. The behavior of subgrade improved by CDRC has been analyzed by 2-D Biot consolidation plane strain finite element method. The result shows that the drainage capacity of CDRC can meet the requirement for drainage. Besides

it also shows that the technique can applied to lower foundation additional normal stress and excess pore water pressure

restrain the lateral deformation of foundation effectively

decrease vertical settlement and differential settlement of soft foundation and improve the foundation stability with remarkable effect compared with the traditional horizontal dewatering sand cushion.