基于应力–渗流–损伤耦合效应的断层活化突水机制研究

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Abstract Based on investigation analysis and classification statistics of massive cases of water inrush geological hazards in mining activities，catastrophe evolution mechanism of water inrush of retarded type for filling fault has been researched；the variation characteristics of fault occurrence，filling ability and water conductivity due to mining effect have been analyzed；the physico-mechanical characteristics of filling medium effect on water inrush channel formation of fault activation have been analyzed. Taking the filling fault under pressure water for example，the mechanical characteristics and seepage properties of filling medium at elastic region and strain-softening zone with different distances from the aquifer have been analyzed；and the function of water effect on filling medium strength has been adopted to the constitutive relation of shear stress and deformation，in order to establish the swallowtail catastrophe model of water inrush for filling structure slipping；and the main influencing factors of catastrophe evolution path have been derived from the bifurcation set of system potential function. For the filling fault above the pressure water，the seepage damage characteristics of filling medium for its failure process have been analyzed. Considering the double failure criterion of compression shear and tension shear，and the coupling equation of stress and seepage damage which is suitable for the damage description of pre-and post stages has been adopted，in order to get the catastrophe evolution process of floor cracks evolution，activation process of fault filling medium and formation of water inrush passage. Through the simulation analysis of water inrush of fault activation with different dip angles and fault throws，the coupling effect of stress and seepage damage have been analyzed；and four typical styles of water inrush paths have been put forward by accurately locating the different evolution paths of water inrush. The conclusions can provide reference for the study of the mechanism of water inrush and its control.

Key words： mining engineering deep mining fault activation filling medium water inrush passage mechanism of catastrophe evolution process

Received: 05 January 2011

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http://www.rockmech.org/EN/Y2011/V30/IS1/3295

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