The Jet Grouting Applications In Soft Soil Foundation Treatment

In geotechnical engineering, every kind of technique of subgrade disposal got thoroughly research and extensive application in engineering practice. The high pressure jet grouting was initiated in Japan in 1960's . In our country, it was applied 30 years ago, firstly used by railway ministry to do experiment of one-piple method in 1975. The three-piple method was applied in an engineering of Baoshan steel company in 1977 by metallurgy ministry, and obtained great achievement. In this thesis a special research is done , of which the soft soil foundation is treated with high pressure jet grouting.Firstly, the main material used in high pressure jet grouting is cement, which is mainly used in architecture engineering, and has been developed well in research of the characteristics of concrete. By the theory of continuum medium mechanics of non-Newton fluid, the characteristics of cement liquid and it's rules of spreading in soil are acquired. Secondly, in the aspect of construction equipments and construction craft mainly used in our country, some useful conclusion is acquired. Moreover, through the research of disposal of soft soil foundation, The technique of high pressure jet grouting was developed by using it to treat soft soil. It was also analyzed of the characteristic of cement-stablized soil, which was used as pile or composite subgrade. The method of design and calculation in the engineering of high pressure jet grouting was achieved by the tool of VB6.0, and the software based on MatLab6.5 was also fulfil to optimize the diameter and the length of pile under some restriction. In the end, the application of the technique of High pressure jet grouting was made further by an example of engineering.