Abstract: To objectively predict the location and width of surface fissures in high relief coal mining subsidence areas, according to the generation mechanism of surface fissures, a slope segment deformation has been predicted based on the vectors’ decomposition and synthesis principles using the equal gradient slope segment in the main section as research object and the subsidence and horizontal movement prediction values as main parameters. Taking the critical deformation value in rock and soil mechanics as the criterion of the beginning of surface fissures, this model is used to determine the location of the slope segment of the surface fissures and the width of surface fissures per unit length induced by mining. The feasibility and effectiveness of the method are tested by a case study of the 1208~1210 double face subsidence area of Jialequan Coal Mine in Shanxi Province, which shows a good fitness between the observed results and the predicted values and distribution pattern of slope segment deformation and location of surface fissures.

Key words: surface fissure, prediction model, high relief mining subsidence, deformation prediction, coal mining subsidence area