Abstract: The small coal mines have characterized by small mining depth, disorderly distribution of mined-out areas, and in hidden nature. The distribution area constitutes a complex damaged geology, which brings a great hidden hazard to engineering construction. To explore the main factors of the influence of the abandoned small coal mines on the stability of a proposed project more accurately, this paper takes an abandoned small coal mine of a power plant as the working background and adopts the analytic hierarchy process (AHP) to analyze it. The comprehensive evaluation index system of 12 indexes is constructed, and the weights of each factor are obtained and compared in order of importance. The main factors affecting the stability of the proposed project are the depth of the mine roof, the load of the building and the safety and stability of the coal pillar. The results are generally consistent with the engineering practice. This case history provides a basis for the subsequent evaluation of the stability of the abandoned site of small coal mines.

Key words: Analytic Hierarchy Process, Small Coal Mine Roof, Stability, Evaluation Indicators, Impact Factors