Abstract:

A great loss usually occurred in the process of mining due to bad rock instability.Therefore an urgent evaluation research on rock mass stability is necessary for pre-construction.According to mining area joints fractured surveies，statistical methods and results，basised on the experiments of engineering geological joints fractured sketch statistics rock mechanical nature，the studies combined with Jiaojia gold of the engineering geological conditions.We use methods of investigate and statistical analysis on the spot，indoor rock mechanic test，and a method of rock classification combined by different classification methods，and nonlinear finite element numerical analysis，to discuss further on the relationships of joint fissure and the stability of surrounding rock of underground tunnels.According to different security levels of mine，relevant mining technology solutions are determined.Deep discussion and research about the relationships of joint fissure and the underground rock mass stability are carried out.

Key words:  Engineering geology, Rock mechanics, Rock mass stability