TY - JOUR
TI - The characteristics of mining induced stress fluctuations in broken rock mass over one kilometer deep coal mine
AU - Li Cong
AU - Yin Xiangang
AU - Xie Jing
AU - Peng Gaoyou
JN - Thermal Science
PY - 2019
VL - 23
IS - 13
SP - 843
EP - 851
PT - Article
AB - Mine pressure is critical to the safety of working face. Evaluating the working resistance accurately of the stope hydraulic supports is one of the most effective and direct ways to reflect the overall stress characteristics of the roof and the defor¬mation, movement and destruction of overlying strata. Due to the complex breaking form of the roof, the working resistance of the hydraulic supports at different positions of the mining face varies in different ways. One can obtain the pressure of hydraulic support system by pressure monitoring and analyze its fractal characteristics. Through spectrum analysis, a new parameter called accumulation power spectral density is defined which is used to describe the difference of working resistance of stope hydraulic supports. The results show that the fractal dimensions of face-end supports are smaller and face-end supports are unco-ordinated. Through in-situ monitoring, it is found that the mining stress has unstable periodic fluctuation characteristics. The conclusion can provide reference for rational selection and optimization of the similar-mining lay-outs.