Application of Improved EAHP on Stability Evaluation of Coal Seam Roof

Stability of coal seam roof is one of the important factors to ensure safe and efficient coal production. Stability result is the complex interaction subjected to a larger number of geological factors. Only taking comprehensive consideration into evaluation can the result be in line with the actual complex geological environment. Main factors of coal seam roof stability are divided into four major factors and eight secondary factors. Major factors are sedimentary environment, structural feature, rock mechanics property and so on. Secondary factors are the combination of roof rock, lithology difference, bedding changes, and so on. Stability rank is divided into four grades: super stability, stability, basically stability and instability. EAHP model of stability evaluation of coal seam roof and the extension comparison matrix are established by means of the improved EAHP (Extension Analytical Hierarchy Process) method. Using the method based on judgment by possibility degree matrix can get the Sorting order. Evaluation results show that: the stability grade of main coal seam 5# roof of the mine is stable. It is true and credible. The method not only has the merits of “Extension to consider fuzziness of human thinking to judge”, but also eliminates a lot of spreadsheet work in traditional AHP. These studies are useful experiment and explore to study on comprehensive evaluation of coal seam roof stability.