The Effectiveness Analysis Of The Composite Foundations Using CFG Pile And High Pressure Jet Grouting Pile For Jing-qin Second Channel Highway

In China the distribution of Weak foundation is very extensive, and it is very commonto be discovered in the Province like Beijing, Tianjin and Hebei. And if the highwaysubgrade is constructed above the geology like this, and less attention is paid on it, it is verypossible to make the subsequent construction of roadbed subsidence or excessive instability,causing damage to the road which will work not normally. Under the consideration of this,the introduction of the CFG piles and the high pressure jet grouting piles can better solvethe problems occurred for the situation of the weak soil, especially the soft clay and clay, toensure maximum safety and comfort of passing pedestrians and vehicles.Firstly, it is begin with relative theory of weak foundation treatment in the paper, thenthe basic overview of CFG pile and weak foundation are theoretically introduced. In thisthesis, the action principles of the soft cushion in CFG piles and high pressure jet piles areanalyzed, through the research of the role which the cushion act and calculation methods ofthe CFG pile foundation bearing capacity, combing with several actual productions fromthe field experiences and relevant industry standards. Furthermore, a depth analysis of theuse of CFG pile construction technology and quality control in the construction progress ofthe highway weak foundation is carried out, incorporating the actual cases of the soft soiltreatment in the project of Hebei Jing-Qin Second Channel Highway, the design processesand construction methods of the CFG piles are deeply discussed, evaluations and analysesof the technical and economic effects are provided.