Evaluation of Rock Mass Quality by Single Fractal Dimension and Mutifractal Spectrum

摘要

The classification of rock mass quality is of great significance in the engineering construction. On the basis that structural planes present the self-similar feature, this paper applied the spatial analysis function of GIS to analyze the spatial data obtained from two rock mass in Badong group of a slope in Three Gorges Reservoir region, calculated the single fractal dimension and obtained the multifractal spectrum, which were then applied to evaluate the rock mass quality. The steps of calculating the multifracal of structural plane in GIS platform were described, and the relationship of a serial of multifractal parameters with complexity, in homogeneity and local singularity of structural plane in rock mass was analyzed. The results of this study indicate that single fractal dimension can explain the integrity of rock mass and replace RQD to classify quantitatively rock mass quality; however, multifractal spectrum can reveal more effectively the complexity and local singularity in the distribution of structural plane in rock mass, and present more detailed and additional information for the classification of rock mass quality, and therefore can provide valuable reference for utilizing reasonably engineering rock mass and evaluate the stability of the rock mass, and improve the development of quantitative evaluation of rock mass quality.