Research On The Design Method And Engineering Accomplishment Of Cement Flyash Gravel Piles Composite Foundation

Nowadays, with the economic development and the extending scale of the civil engineering construction, the disposing to original foundation has been more and more taken into account as a segment in designing and working. The method of Cement Flyash Gravel piles composite foundation has been widely used due to its great advantages such as the economizing on material, the fast speed on working and the fine effect on consolidating, especially, the raising and practicing on the multiple designing methods of Cement Flyash Gravel piles composite foundation, which has been played an important role in the development of the theory and practice of composite foundation in recent years.The bearing character and working mechanism of Cement Flyash Gravel piles composite foundation are analyzed, following which the multiple designing methods and applying on projects are less comprehensively studied in this paper which are based on the available scientific achievements of Cement Flyash Gravel piles composite foundation. Therefore, the main problems are studied in this paper hereinafter:1.The designing thought of Cement Flyash Gravel piles composite foundation is provided, which is based on how to raise the bearing capacity and how to reduce the deforming of composite foundation. The designing thought is analyzed, in which the problems are disputed at present whether Cement Flyash Gravel piles are rigid piles and the conception of composition are studied in this paper.2.According to the designing pattern of bearing capacity of Cement Flyash Gravel piles composite foundation, the several calculating methods on the bearing capacity of Cement Flyash Gravel piles composite foundation are analyzed and compared, in which the data selected and the depth and width modified are studied.3.According to the deforming pattern of Cement Flyash Gravel piles composite foundation, the calculating methods on the deforming of Cement Flyash Gravel piles composite foundation are analyzed and assessed.4.The general designing regulation of Cement Flyash Gravel pilescomposite foundation is provided based on the district differences. The designing thought of suspending piles developing from the designing method controlled by deforming in feeble foundation and the optimizing method of plate designed developing from the optimizing design of the bearing capacity of composite foundation are studied, and the designing method of Cement Flyash Gravel piles composite foundation considered the district differences is discussed combined with the local criterion of Hubei province. According to the engineering project, the application of Cement Flyash Gravel single-element piles composite foundation is studied in the high-rise building.5.According to the designing thought of multi-element piles composite foundation, the consolidating mechanism and the designing method of CFG-PSA-LPS three- element piles composite foundation in feeble foundation are discussed. According to the engineering project, the application of CFG-PSA-LPS three- element piles composite foundation is studied in the deep feeble foundation.Finally, some problems of Cement Flyash Gravel piles composite foundation, which remain to be studied, are put forward on the basis of concluding the researching works in the paper.