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对结构面迹长的描述与估计对计算结构面连通率至关重要。目前,描述基体裂隙迹长的方法通常偏重于平均迹长的估计,难以精确描述结构面迹长的空间发育状况。基于分形理论,利用分形维D描述了结构面迹长分布模式。如果结合结构面迹长区间、优势迹长区间及其内裂隙发育的相对数量I(%),即可详细描述基体裂隙迹长的空间发育状况。以西南某大型水电站工程坝区建基面的基岩裂隙为例,对分形维D和裂隙发育的相对数量I(%)进行分类和组合,总结出结构面迹长发育的3种模式:M1、M2和M3,并探讨了各种迹长发育模式下,连通率k的影响控制因素。结果发现,当裂隙迹长的发育模式为M1和M2时,结构面的空间分布状况对连通率k的影响较大;当裂隙迹长的发育模式为M3时,连通率k主要与裂隙迹长的平均值L0有关,相应裂隙空间分布对k的影响较小。
The description and estimation of structure surface trace length is very important to calculate the connectivity of structure surface. At present, the method of describing the crack length of the matrix is usually more emphasis on the estimation of the average trace length, so it is difficult to accurately describe the spatial development of the structure surface trace length. Based on fractal theory, fractal dimension D is used to describe the distribution pattern of structure surface track length. If we combine the relative length of the structural surface trace interval, the dominant trace length and the relative number of fracture development within I (%), you can describe in detail the crack space length of the matrix of the spatial development. Taking the bedrock fissures in the dam foundation of a large hydropower station project in southwest China as an example, the relative numbers of fractal dimension D and fracture development I (%) are classified and combined, and three patterns of structural surface trace growth are summarized: M1 , M2 and M3, and discussed the influence control factors of the connectivity rate k under various trace growth patterns. The results show that the spatial distribution of the structural plane has a great influence on the connectivity rate k when the development modes of the crack path length are M1 and M2. When the development mode of the crack path length is M3, the connectivity rate k is mainly related to the crack path length The average L0, the corresponding fractures spatial distribution of k less affected.