In this paper

isotropic compression tests on clayey soil with pore water of different salt concentrations were carried out. Meanwhile

the testing results were used to analyze the effect of osmotic suction on compressibility. According to the experimental results

isotropic deformation characteristics were significantly influenced by osmotic suction. As osmotic suction increases

the slope of initial elastic compression line increases and stress decreases

while the effect of osmotic suction on the slopes of elasto-plastic compression lines and swelling lines can be neglected. Based upon the experimental results

a constitutive model considering in-pore salty solution influence for clayey soil is proposed under isotropic condition. Through the verification

the model is valid for simulation of isotropic compression behavior. Additionally

the proposed model could be adopted to simulate the response of saturated soil with salty solution to the change in osmotic suction. The experimental result is of vital importance to develop a constitutive model considering chemical-mechanical coupling.