Abstract: With development of marine engineering in large-scale and deep-water， it is necessity to develop new techniques for underwater foundation constructions. This article introduces a consolidated pile-type caisson， which combines suction caisson and marine consolidation anchor technology. The caisson's structure and operational principles is introduced. A series lab tests are conducted for its characteristics of vertical pull-out forces. The experiments demonstrate that the caisson's shear area is significantly increased by the secondary consolidated body and then significantly enhances the anti-pullout capacity compared to conventional suction caissons. The recommended caisson fill volume is 1/20 of Ms， where Ms represents the mass of soil that grout-in the pile. The maximum anti-pullout force of coarser caissons occurs when the length of the pile is 1.5H （H is the height of the caisson）， while for slender caissons， the maximum anti-pullout force occurs within the 1.5H—2H of the pile length. The consolidated pile-type caisson processing higher holding capacity to its weight higher than traditional caisson and easy construction would have promising potential engineering applications.

Key words: consolidated pile-type caisson, cohesive seabed, grout-in quantity, anti-pullout capacity, underwater consolidation, uplift test