The Analysis Of Construction And Monitoring Of Dredger Fill Ground Using CFG Pile Composite Foundation

In this thesis, Xiamen east coastal area Torch Industrial District (general plant phase III) 2007G15-1,2 plot is the engineering background. The engineering geological condition of this project is southeast coastal beach, the weak layer of the soil is mainly dredger fill, groundwater table influenced by seawater, which is highly corrosive. To solve this engineering geological problem, a major way is adopting composite foundation. According to geological reports, taking all factors into account, the Cement Fly-ash Gravel pile composite foundation was selected, and its main characters are high bearing capacity, convenience of construction, easiness of quality control and low engineering cost, etc.There are various construction methods of CFG pile composite foundation which is adopted for reclaimed soil foundation. This project selected the vibroflotation method to construct. The construction method of vibration technology and procedures, quality of construction method of vibration control are described in this paper. Author conducted the long-term of the force and the settlement of CFG pile composite foundation of the selected monitoring points in Xiamen east coastal area Torch Industrial District (general plant phase III). The monitor included the earth pressure and settlement of pile top, soil between piles and column strain. The methods of monitor included level measurement for settlement of the piles, the settlement gauge set on the pile foundation, pile top and soil between piles for the settlement of pile top and soil between piles.The monitoring results show that, the force of the pile top influenced by the load and the arrangement of the piles, soil between piles force received more evenly. The settlement of the pile top and soil between piles meet the design requirements. The settlement of the soil between piles is the main reason of the settlement of the pile top pierce into the cushion. Through the monitoring results, we understand the soil stress state and deformation on CFG pile composite foundation, discriminated the feasibility and reliability of CFG pile composite foundation, provide reference and guidance for the similar projects in future design and construction. Overall, the result indicated that CFG pile could provide necessary bearing capacity to the upper structure, and it is feasible, reliable and economical to use this treatment measures on reclaimed soil foundation.