Aiming at the defects that lateral pressure coefficient,K0,is mostly assumed to be constant by engineering experience in practice,systemic tests of K0 consolidation on two kinds of Ningming unsaturated expansive soil using GDS triaxial apparatus were carried out.The results indicate that K0 is a function of water content and confining pressure.For the same kind of soil,K0 increases approximatively linearly with confining pressure,but nonlinearly with water content,the increase rate of which is small at the ...