Numerical study on the effect of increasing diameter of jet grouting columns in sand lenses in clay layers

One technique for increasing foundation bearing capacity, reducing settlement, and preventing liquefaction is jet grouting columns. Rock and soil cutting by jet became the basis for this technique, which has since developed into one of the most popular choices. The type of soil, the method of application, and the amount of cement used are just a number of the factors that influence the diameter and resistance of the column in this method, for example if this method is implemented in granular soil, the column has greater resistance and diameter than clay soils. One of the challenges of this method that engineers face in many projects is the existence of soil with various layers. This paper used numerical analysis to investigate the effect of increasing the diameter and resistance of the jet grouting column in sand lenses in clay layers. Geotechnical data from a project in the south of Iran, was utilized to investigate this topic. In order to check the performance and compare the jet grouting columns by enlargement with regular columns, two measures of reducing the execution time for the same cement consumption and the amount of settlement for the same number of columns were investigated.

کلیدواژه ها:

Soil Improvement ، Jet grouting ، Raft Foundation ، Underreamed columns ، Settlement