Abstract: Aiming at the defects that the lateral pressure coefficient K0 is mostly assumed to be constant by engineering experience in practice and in numerical analysis,systemic tests of K0 consolidation on the shallow gassy sand to identify and obtain its value of K0 were carried out. Results show that K0 of the unsaturated gassy sand is not fixed value,and soil structure,moisture content and density all affect it. Its value increases with the rising of moisture content and decreases with the increase o...