Study on stability classification of surrounding rock of coal gateway based on fuzzy clustering method

Abstract

Aiming at the stability of surrounding rock of large section coal roadway in Zhaozhuang mine，the fuzzy clustering method is used to classify 15 roadways in 3 panels in Zhaozhuang Mine.Through the statistical analysis of the classification indicators，the strength of the roof，σc1，the strength of ribs，σc2，the strength of floor，σc3，the depth of the roadway，H，the ratio of Roadway height and mining height ，N，pillar width，X，the maximum horizontal principal stress σh were selected as an indicator of rock stability classification.According to the field investigation data，the discernibility matrix is obtained，and the weight of the classification index calculated is respectively 0.13，0.05，0.05，0.07，0.21，0.17，0.21.Using fuzzy clustering method to calculate and analyze，it is most reasonable to divide the selected coal roadway into six categories，and the surrounding rock of each category has similar stability.The same or similar support means can be adopted to maintain the same category roadway.Field tests show that the fuzzy clustering results of the classification of roadway can effectively guide the design of surrounding rock support parameters of the roadway to keep the surrounding rock deformation within the controllable range.

Keywords

• urrounding rock stability
• fuzzy clustering method
• discriminant matrix
• index weight value