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Abstract Aperture rock mass permeability plays an important role in site selection and evaluation of high-level radioactive waste repository. The characteristics and magnitude of the drilling borehole rock mass permeability are characterized by the aperture geometry parameters which are obtained by Borehole Television. With regard to the defects and error of the traditional statistical method to determine aperture geometry parameters，this paper proposes a new statistical method. According to spatial variability of the rock aperture，a homogeneous area partition is proposed based on the aperture density and occurrence. The preponderant group of the aperture development is determined by clustering analysis method. In consideration of the influence of measurement error in determination of the aperture interval，a correction formula is proposed in this paper. The effective hydraulic opening of aperture is determined by the mechanics causes. When the aperture geometry parameters are put into the permeability tensor calculation program，the drilling rock mass permeability tensor，permeability principal value，and the main seepage direction could be obtained. The results can provide a basis for drilling rock mass permeability analysis.
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2015, Vol. 34 
