The Study Of Bag-Grouting Pile Applied In Soft Foundation Treatment Of Railway

As a new treatment method of soft foundation, bag-grouting pile method has been used in railway engineering construction to some extent, and achieved good economic and social benefits. At the same time, bag-grouting pile method has the advantages of low cost, safety and environmental protection, short construction period and other characteristics, the method has great popularization and application space. However, bag-grouting pile reinforcement technology has many problems needed to be studied, such as bag-grouting pile construction equipment, construction parameters, the bag pile grouting pile composite foundation, settlement calculation method, design method of foundation work traits etc.After a summary of the previous work, relying on a coastal railway engineering and an existing railway two drainage project in Shanghai bag grouting pile reinforcement section, through indoor experiment and theoretical analysis, focused on the following issues:(1) First of all, through pile technology testing and summarizes the practical experience, study the bag grouting pile construction technology, including construction machinery, pile material, construction parameters, quality control measures and so on. At the same time, studied the bag grouting pile properties, including the quality of pile, pile strength etc., Not only validation of the feasibility of the construction process, but also provides reference for the bag-grouting pile applied to soft soil foundation reinforcement.(2) Secondly, carry out bag-grouting pile composite foundation field engineering test, through setting the test section and burying test equipment, contrast data of with and without using the bag-grouting pile test cross section, study on characteristics of bag-grouting pile composite foundation.(3) Finally, under the premise of summing up the bearing properties of other composite foundations, summarized the bag-grouting pile composite foundation design methods. At the same time, discussed the bag grouting pile settlement calculation methods of composite foundation, and supplemented by examples, Then analyzed the bag-grouting pile composite foundation bearing capacity, and some conclusions are obtained.