Study On Mechanism Of The Long-short-CFG Pile Composite Foundation

With the rapid development of composite foundation theory and practice, plenty ofnew composite foundation treatment technology has been used into the actual project,This study of the long-short-CFG Pile Composite Foundation is about how to make thenew composite foundation treatment technology been commonly used. Because theremay have many factors that affect the composite foundation in the actual engineeringthat made more difficulty for the theory research which is far more behind the actualengineering, then need deeply research in this study, so this article made the followingresearch.(1)This report has introduced the basic concepts of composite foundation, researchstatus and mechanism of action, and based on those introduction theories, we added inthe concept of the long-short-CFG pile composite foundation, the recent rsearch resultand design ideas, also analyze the capacity for the long-short-CFG pile compositefoundation and floating behavior, this study has described the importance of the roleand thickness factors of the cushion in composite foundation.(2)By known engineering measurement of CFG pile composite foundation bearingcapacity inverse calculation of pile soil play coefficient values. Use that way we can getthe affect factors for pile soil play coefficient. In return, more deeply research resultmay get for that study which is the coefficient value for pile soil play coefficient fromthe capable number of capacity for long-short-CFG pile composite foundation. Finally,the function between the coefficient value for pile soil play coefficient and the capablecapacity for long-short-CFG pile composite foundation may get in the situation ofcombined composite foundation computing model.(3)Choose a company doing the CFG pile composite foundation load test and pilesoil stress ratio test in a place named Handan, while for some reasons that the capacityin CFG pile composite foundation that does not meet the requirements. Using acomplement pile design into the formation long-short-CFG pile composite foundationand again passing through a load test and pile soil stress ratio test after that. Lastly theavailable range can be calculated for the composite foundation capacity for pile soilplay coefficient.(4)Based on the actual practical engineering, useding FLAC3Dfinite difference software to analyze the model of CFG pile composite foundation and long-short-CFGpile composite foundation. The total settlement and the pile soil stress ratio under theload of two composite foundations can be gained from the software. From thisinformation, a simulated model may get for the CFG pile composite foundation and thelong-short-CFG pile composite foundation capacity range. Compare the actual valueand simulated value, we found those two curves are almost matched which have provedthe reasonable for building this model. And long-short-CFG pile composite foundationsettlement for half of the CFG pile composite foundation, and the long-short-CFG pilecomposite foundation pile soil play coefficient is greater than the CFG pile compositefoundation, This would be quit valuable for the actual design engineering project andpractical.