Drainage consolidation method is an effective measure to solve the settlement and stability of muddy soft clay foundation, which consists of drainage system and pressurization system. Drainage system is a structural system in which drainage bodies are arranged in the foundation, and drainage is concentrated by the drainage bodies by using the water permeability of the stratum itself. According to different drainage bodies, it can be divided into manhole drainage and plastic drainage belt drainage. The soft layer of silt in the reclamation seawall of Guoqiaoshan in Fuqing, Fujian is more than ten meters deep, and the drainage and consolidation treatment with plastic drainage belt has been successful. The foundation of Daguanban seawall in Lianjiang County, Fujian Province was strengthened by sand drain consolidation method. The following introduces the method of treating silt soft foundation with high-efficiency plastic drainage board. When the drainage board is inserted into the soft foundation, when the foundation and superstructure are filled, the load acts on the soft foundation. Due to squeezing and capillary action, the groundwater rises into the sand cushion along the plastic drainage board and is discharged from the sand layer to both sides, thus improving the bearing capacity of the foundation. The plastic drainage boards shall be constructed after the sand cushion is completed, and the processing range shall be measured by the surveyor, and the specific position of each drainage board shall be marked. The inserting machine shall be centered and horizontal. Put the drain board on the drill bit, start the pile driver to hammer the drill pipe, and cut off the plastic drain board on the ground, leaving a certain margin. After sand is filled around the plastic drainage board, the root construction is completed.
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