岩体结构均质区划分法的适用性研究

Applicability research on structural homogeneity delineation of rock masses

岩体结构均质区划分是结构面统计与建模的基础。实践中以主控要素作指标、以最优划法为依据,更易获客观真实划分结果。针对国内核废料处置库北山预选区岩体结构面,开展了测窗范围截取、取样偏差及块网变异修正前处理,编程实现了多种方法下的均质区划分,初步探究各法在北山的判别力、适用性、局限性。结果表明:针对北山预选区而言,关联系数法和Mahtab法适用性较弱,Miller法最强;而Miller法中又以"34格大面积块"的划分效果最佳。将此最优划法应用至北山芨芨槽块段,希望能给结构面网络建模及后续渗流计算提供有益参考。

Delineation of structural homogeneity of rock masses is the basis of statistics and modeling of discontinuities. In practice, an objective partition result is easier to obtain with key factors as indicators and optimal delineation as the final judgment criterion. In order to better characterize the discontinuities in Chinese high-level nuclear waste disposal preselected region in Gansu Beishan, the measure window truncation, sampling bias and grid variability correction are carried out to deal with the discontinuities of rock masses. Such programming realizes structural homogeneity delineation by using a variety of methods and has a preliminary probe into the distinguish capability, applicability and limitation in Beishan. The results show that, as far as the Beishan preselected area be concerned, different delineation schemes are obtained in which the applicability of the correlation coefficient method and the Mahtab’s method are weak in applicability while the Miller’s method is the best and the Miller’s method is increasing sequentially. It is worth mentioning specially that in the Miller’s methods, the 34-block scheme receives the most satisfactory result. At last, the optimal method is applied to Jijicao area; and the delineation result provides a useful direction for the structural network modeling and the following seepage flow path calculations.