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Abstract The 3D modelling and the identification of unstable blocks are the crucially basic issues in jointed rock mass stability research. The deterministic structures of rock mass can be measured by adopting digital photogrammetry，and the model can be built by 3D structural network simulation，intersecting lines of surface structure and closed-loop analysis. A new block identification method is proposed：rock mass is divided into mesh and small block units are formed，then structure surfaces are added orderly to cut block into small units，after that mesh is removed and small block units are merged，finally a complex block is formed. An engineering example is analyzed based on this new identification method. The results show that the method is possessed of preferable generality and reliability，and it also could be used for advanced prediction and reinforcing scheme optimization in excavation process of rock tunnel.
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Received: 30 November 2009
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