Abstract: The deformation characteristics of gassy soil and the influence of the stress path on the engineering characteristics of gassy soil under controlled and uncontrolled deflation conditions are described, and the corresponding engineering measures are summarized. The development trends and existing problems of gassy soil classification and structural characteristics, mechanical characteristics, deformation characteristics, and other engineering characteristics are introduced. The results of comprehensive research indicate the lack of shear strength formulas that can be applied to a variety of complex stress paths. Further, the constitutive model lacks a pertinent theoretical basis, and the settlement model considers fewer factors. Furthermore, the existing research results regarding the engineering characteristics of gassy soil are summarized, and relevant suggestions for future research on the engineering characteristics of gassy soil are proposed. The following features are examined in this study: basic physicmechanical properties of gassy soil, deformation mechanism of gassy soil under various construction stress paths, deformation mechanism of gassy soil under train moving loads, and liquefaction and geological hazards of marine gassy soil under wave load.

Key words: gassy soil, engineering characteristics, shear strength, constitutive model, settlement model