Abstract: With the rapid development of the logistics industry, logistics warehousing projects are gradually increasing, and the problem of soft ground treatment of large area building floor is also increasing. This paper presents a case history of ground treatment of a logistics center project in Qingdao, which involves poor geological conditions such as miscellaneous fill, soft clayey soil, plain fill, muddy soil and chemical white mud.  A variety of ground treatment methods are comprehensively evaluated under these site conditions. The dynamic-rammed gravel columns are used to strengthen the large area for the proposed storage floors and foundations, which are dominated by deformation coordination design to solve the concerns of soft soil settlement, insufficient bearing capacity and uneven settlement. This paper describes the design, construction technology and method of dynamic-ramming gravel piles in hole of soft soil foundation. Furthermore, the field test results of composite foundation are analyzed, the results show that the method has satisfactory treatment effect and the relevant conclusions can provide reference for similar projects.

Key words: Dynamic-rammed Gravel Columns, Ground Treatment, Soft Soil Settlement, Deformation Coordination