(1. Hubei Key Laboratory of Construction and Management of Hydropower Engineering，China Three Gorges University，Yichang，Hubei 443002，China；2. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety，Hohai University，Nanjing，Jiangsu 210098，China)
Abstract：Achieving three-dimensional(3D) real-time dynamic visualization of spatial monitoring data field is the key of safety monitoring online visualization analysis in the slope engineering. 3D nephogram is the most direct expression of the spatial monitoring data visualization. The drawing methods of 3D nephogram include surface rendering and volume rendering，and volume rendering is the preferred method to realize the drawing of 3D real-time dynamic nephogram of the spatial data field. According to the flexible scene interaction and rich nodes for modeling，through generating the tetrahedral network(TEN) geometric model for showing the 3D nephogram of monitoring data field，on the basis of the extracting coordinates of monitoring points and forming the monitoring data field，applying the algorithm of spatial interpolation to achieve the value of monitoring physical quantity in the TEN nodes，and mapping the specific color in specific color domain value to grid nodes，finally，the method of X3D-based 3D nephogram of spatial monitoring data visualization with volume rendering is proposed. Taking the slope of a hydropower station and some accumulation body for example，the 3D nephogram of spatial monitoring data real-time dynamic visualization in the slope engineering is realized，and the deformation trend and potential deformation failure mode of monitoring object is revealed. These may provide reference for the application of this method to the slope and underground safety monitoring fields in hydroelectric engineering and geotechnical engineering.
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2012, Vol. 31 
