The groundwater problem is a key issue which affects stability of the surrounding rock in tunnel engineering. A method is proposed to depict mechanical and hydraulic behavior of the tunnel ground by tunnel excavation. Based on structure of rock mass and concept of representative element volume(REV)

the methods of hydromechanical coupling model is proposed. Relevant methods of establishing tunnel excavation hydromechanical coupling mathematical models are proposed. The analysis results indicate the influence boundary of stress disturbed is smaller than that of seepage disturbed boundary. The seepage forces caused seepage increase stresses and deformations in tunnel ground. According to the interaction principle between ground and support structure

the seepage effects should be considered in tunnel support structure design.