Abstract:This paper firstly introduces the advance and development of international consortium of DECOVALEX (development of coupled thermo-hydro-mechanical(THM) models and their validation against experiments) project. A general summarization on the study of progress in mechanical-hydro-chemical coupling process in rocks is presented,followed by a detailed introduction to the progress of DECOVALEX Task_B and Institute of Rock and Soil Mechanics,Chinese Academy of Sciences(CAS). Efforts of CAS are focused on uniaxial and triaxial compression tests,meso-mechanical tests and CT tests under the coupled stress-chemical condition. Based on the influences of chemical corrosion on mechanical and failure properties of rocks,the fracture criteria of multi-crack with chemical corrosion are proposed. Furthermore,a new numerical model named elastoplastic cellular automata for modeling rock failure process is set up by CAS,in which heterogeneity and flaws in rocks can be easily considered,and some typical behaviors of rocks such as Kaiser¢s effect and Class II curve are successfully modeled using elastoplastic cellular automata. Another cellular automata model for modeling coupled hydro-mechanical process for porous materials is also proposed,and the influence of water pressure on mechanical properties of rock and its meso-mechanism are analyzed using this model. The above-mentioned advance greatly promotes the research on mechanical-hydro-chemical coupling process in rocks.