关键词: 双河煤矿, 顶板变形量, 顶板裂隙, 线密度, 分形维, 顶板稳定性

Abstract: The deformation of roadway roof is considered as an important index for evaluating the stability of roadway roof. In addition, the spacing fractal dimension of the fissures is a significant parameter of comprehensively reflecting the development and distribution characteristics of the fissures in roadway roof. In this study, a mathematical relationship between these two indexes was established. The multiple-point displacement meter was used to monitor the roof deformation of the mining induced roadway in Shuanghe Coal Mine. Meanwhile, the mine bore TV imager was employed to observe the development and distribution characteristics of the fissures in roadway roof. Thus, the spacing fractal dimension of the fissures was calculated. The monitoring results show that the most developed fissures were found in the range of 0~2 m of the roof. In this range, the linear density of fissures followed the same change law with the spacing fractal dimension of the fissures, and a linear relationship was found between them. The same change trend exists both in the roof deformation of the roadway and the associated spacing fractal dimension of fissures. The corresponding roof deformation increased with increasing the spacing fractal dimension of fissures, furthermore they increased linearly. This study indicates that the spacing fractal dimension of fissures in roadway roof is an indicator that can comprehensively reflect the stability of roadway roof. Hence, this study provides a reliable basis for evaluating the stability of roadway roof and designing the supporting.

Key words: Shuanghe Coal Mine, roof deformation, roof fissures, linear density, fractal dimension, roof stability