Abstract: The safe utilizing the abandoned mine voids site is an efficient approach to expand the available development space for the city, in which an elementary work is to estimate the effect of the ground subsidence on the adjacent construction site. The classical ways are deficient in the surface movement and deformation analysis above the abandoned mine voids under the complicated geological conditions, such as inclined seams, faults and a relief surface. This paper presents a case history of the abandoned gypsum mine goaf in Jinmen, Hubei. The GDEM software which is used based on the continuum and noncontinuum numerical method is employed in the analysis of the ground subsidence. Then the effect of the goaf on the adjacent construction site is evaluated. Furthermore, numerical models with various inclined angles for seams and different faults are established. Their surface movement and deformation are acquired, and the effects on the construction site are compared. Results show that the seams dipping opposite to the site has less effect than the seams dipping towards the site. And the influence zone becomes small with the inclined angle of seam increasing. The ground subsidence where the fault dips opposite to the site has less effect than where no fault occurs. And the fault dipping towards the site has more effect.

Key words: GDEM Software, Ground Subsidence, Construction Site, Inclined Angle, Faults