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岩体节理几何特征定量描述是岩体力学性质和渗透性研究的基础,更是核废料处置库场址筛选和评价过程的主要内容。基于甘肃北山高放废物深地质处置库预选区BS17、BS18和BS19钻孔岩芯节理数量修正数据,针对节理间距建立了类负指数分布数学统计模型,进一步应用于RQD体系定量评价深部岩体完整性,通过与RID体系对比验证了概率模型的可靠性。指出节理数量-间距关系具有明显的分段线性特征,分维数随着间距增大而增大。确定了节理间距-数量关系符合尺度律,得出了数量与间距关系的多重分形特征。进一步分析了数量与埋深的多重分形特征,初步实现了岩芯节理的定量描述。验证了多重分形谱可以很好地统计分形维特征,尤其是节理几何形状及分布特征。该研究结果可为实现基于钻孔岩芯节理几何特征数据的深部岩体节理三维网格模拟提供参考。
The quantitative description of the geometrical characteristics of rock mass joints is the basis of the study on mechanical properties and permeability of rock mass, and the main content of the site screening and evaluation of nuclear waste repository. Based on the correction data of core joints of BS17, BS18 and BS19 in the preselected area of Beishan high-level radioactive waste disposal plant for deep-lying radioactive waste of Gansu Beibu, a mathematical model of negative exponential distribution was established for the joint spacing, which was further applied to RQD system to quantitatively evaluate the integrity of deep rock mass The reliability of the probability model is verified by comparison with the RID system. It is pointed out that the relationship between the number of joints and the pitch has obviously piecewise linear characteristics, and the fractal dimension increases with the increase of the spacing. It is determined that the pitch-pitch relationship of the joints is in accordance with the scale law, and the multi-fractal characteristics of the relationship between the number and the distance are obtained. The multifractal characteristics of quantity and burial depth are further analyzed, and the quantitative description of core joints is initially achieved. The multifractal spectrum is verified to be a good statistical basis for fractal dimensionality, especially for the geometry and distribution of joints. The results of this study can provide reference for the 3D mesh simulation of deep rock mass joints based on the geometric characteristics of borehole core joints.