三维岩体质量的多重分形研究

The multi-fractal research on the 3-D jointed rock mass quality

岩体质量是工程岩体性态和边坡稳定性评价的重要参数之一,岩体中不连续面的存在大大地恶化了岩体的工程性质 ,往往使得岩体质量显著降低 由于传统的岩体质量指标ＲＱＤ具有明显的缺点 ,其确定意义难以反映出岩体本身结构的变化性和复杂性 因此 ,以白云鄂博铁矿主矿边坡岩体为例 ,在工程地质测绘的基础上 ,利用蒙特卡洛 (ＭｏｎｔｅＣａｒｌｏ)法绘制出岩体结构网络图 ,从多重分形几何的角度出发 ,计算和绘制出其表征岩体结构分布和复杂性的多重分形谱 。

Rock mass quantity is one of the important parameters of project rock body form and side slope stability appraisement.In rock body the existence of uncontinuous surface has worsened greatly the project nature of rock body,which can reduce rock mass quality noticeably.But the shortcoming of the traditional rock mass index RQD value in present rock mass quantity system is very evident.On the basis of the main mine side slope rock body of Baiyunebo Iron Mine,rock body structural network picture is drawn by using the Monte Carlo and the multifractal spectrum of structural distribution complexity is calculated to determine the nature appraisement and quantitative analysis for rock mass quantity.Furthermore by judging fractal value,especially multifractal dimension,rock mass quantity information can be expound more completely,objectively,accurately than by RQD method.