Abstract: Taking Haishiwan mining area in Gansu province as the research object,2D geological model is set up through the similar material simulation experiment.The slope deformation characteristics during underground mining in mountainous area are studied.The results showed that the displacement at the upper part of slope is less than that at the lower part; The surface displacement vector in mountainous area is under interaction of slope inclination and goaf subsidence,which values at composite vectors of slope inclination and goaf subsidence.The sliding of mountain surface mainly occurs in the topsoil,and the lower strata are only influenced by the goaf subsidence.The surface movement track in mountainous area presents as “S” type in bedding slope,and reverse “S” type in adverse slope.The final displacement of slope surface depends on the influence coefficient of the two kinds of slope.In bedding slope,when the inclination factor is greater than that of the goaf subsidence,the final displacement will migrate towards the inclination,otherwise towards the goaf.In adverse slope,the final displacement is influenced by both combination and always migrates towards the inclination.It is an effective means to study the movement of mountainous surface by adopting similar material simulation experiment.

Key words: Mountainous areas, Underground mining, Similar simulation experiment, Slope deformation