Abstract: Since the conventional deformation and failure measurement of surrounding rockmass in coal-bearing strata are conducted behind the heading face, it is difficult to obtain the deformation of surrounding rockmass, and thus it is challenging to further analyzes the characteristics of deformation and failure in whole excavating process of deep coal roadway. In this study, advance monitoring measurements are performed on deep coal mine roadway in Jining Coal Mine Ⅲ that are arranged at the first time and then the deformation and failure of surrounding rockmass in whole excavating process are characterized. An improved anisotropic stain-soften model with considering volumetric stress is adopted to analyze the characteristics of deformation and failure of surrounding rockmass during excavating. It is shown that both the cumulative deformation and its rate of superficial part are higher than the deep part under the geological condition of 7th mining area in Jining Coal Mine Ⅲ. It is also found that the deformation in the whole process of excavating goes through 3 stages, including slow growth, rapid growth and stable deformation. Moreover, the loosened zone is about 1.0 m when the deformation tends to be stable. After excavation, both the displacement and failure depth of roadway sides are in the controlled range. However, the failure of surrounding rockmass at the roof and floor are relative severe and the corresponding treatment measures are given. Therefore, this paper provides an important basis for revealing the deformation and failure characteristics and the rational determination of supporting scheme and parameters.

Key words: coal-bearing strata, deep roadway, whole excavating process, in-situ measurement, characteristics of deformation and failure of rockmass