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裂隙岩体渗透性是高放废物处置库场址选择和评价的重要因素。钻孔岩体渗透性特征主要依靠钻孔电视获得的裂隙几何参数来确定。针对传统统计法确定裂隙几何参数存在的不足和误差,提出新的统计方法和计算公式。研究结果如下:(1)由于岩体裂隙空间分布多变性,提出以裂隙密度和产状为基础的岩体均质区划分方法;(2)钻孔岩体裂隙发育优势产状采用聚类分析方法来统计;(3)裂隙间距的确定考虑了测量误差的影响,并提出修正公式;(4)裂隙有效水力隙宽提出按照力学成因来确定。将获得的裂隙几何参数代入渗透张量计算程序中,得到钻孔岩体的渗透张量以及渗透主值和主渗透方向,从而为钻孔岩体渗透性分析提供依据。
The permeability of fractured rock mass is an important factor for site selection and evaluation of the HLW repository. The permeability characteristics of boreholes are mainly determined by the geometrical parameters of the fractures obtained by borehole television. Aiming at the shortcomings and errors existing in determining the geometric parameters of fractures by traditional statistical methods, a new statistical method and calculation formula are proposed. The results are as follows: (1) Due to the variability of rock mass fissure distribution, a method to divide the rock mass homogeneity zone based on fissure density and occurrence was proposed. (2) The cluster analysis (3) The determination of fissure spacing takes into account the influence of the measurement error and proposes the correction formula; (4) The effective hydraulic gap width of fissure is proposed according to the mechanics reason. The obtained fracture geometry parameters are substituted into the permeability tensor calculation program to obtain the permeability tensor of the rock mass and the principal values of permeation and permeability, which can provide the basis for the permeability analysis of the rock mass.