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One new similar materical for the expansive soil tunnel in model test is researched and defined which can simulate the most features of expansive soil during wetting and drying cycles. Then, the failure mechanism and deformation rules of expansive soil tunnel are investigated based on the new similar material. Through the research and development of new similar material, those are able to obtain that the new similar material is good at simulate the expansive soil and is able to use for model test to investigate the features of expansive soil tunnel subjected to wetting and drying cycles.