Non-linear coupling classification technique of surrounding rock mass and its application in Jingchuan Mine

The non-linear coupling classification technique of surrounding rock mass was put forward based on the rock engineering system,considering the combined action of influential factors and paying attention to the variation of engineering state.All the influential factors and in-site sample values were firstly searched,then the nerve net was applied to establish coupling effect matrix.The stability classification index was put forward,and the scopes of stability parameters were obtained by the regress statistic analysis of the main influential factors and mechanism of action.It was indicated that,when the rock mass was in five stability states of worst instability,instability,stability,more stability,best stability,then five corresponding scopes of Sp were 0～0.24,0.24～0.46,0.46～0.72,0.72～1.15,>1.15,respectively.Through analysis of the main factors,intact rock strength,rock mass structure,RQD value,and supporting method were taken for the four most beneficial factors to rock mass stability of Jinchuan Mine.But the exploitation depth,groundwater permeability,open degree of structure face,and relation of engineering alignment and discontinuity occurrence were taken for the four worst factors.It was indicated by the application of 1120 m-roadway engineering in Jinchuan Mine that the stability state of surrounding rock mass could be inspected by this technique dynamically to provide duly reliable theoretical basis for the supporting design.