Abstract: With the continuous development and improvement of composite foundation technology, the soil improvement technology of the semirigid columns represented by the cement mixed soil column has drawn more and more attention by engineers and technicians in the engineering practice. The improvement mechanism, stressstrain characteristics, failure modes and bearing capacity characteristic value of the soil among columns after the treatment of the semirigid columns have become the focus of the study. In this paper, the reinforcement mechanisms, stressstrain characteristics and failure modes of the semirigid column composite ground are evaluated and analyzed. The working mechanisms and stressstrain characteristics of the semirigid column are demonstrated by an engineering case history. Based on the field test results, the increased ratio of foundation bearing capacity of soils among columns after the ground improvement with the semirigid columns is also evaluated in this project. This can provide valuable practical experiences and a reference point for similar projects in the future.

Key words: Composite Ground, SemiRigid Column Soil Composite Ground, Mechanism, Characteristics of SemiRigid Column Composite Foundation