钻孔裂隙岩体结构均质区划分方法研究

Zoning method for structural homogeneity of drilling fractured rock mass

岩体结构均质区是针对实际工程特点而划定的成果,在实践过程中需要根据具体工程,抓住主要矛盾后,选择最具影响性的要素作为划分依据。针对裂隙岩体渗透特征这一问题,提出了以密度分区法和产状分区法相结合的均质区划分方法。密度分区法采用重叠窗口对密度绝对差这一指标进行比较来分区;产状分区法首先对列联表中实际频数偏差进行了取样偏差修正,然后利用修正数据对相邻区间进行独立性检验来确定裂隙岩体均质区;采用数学原理对两种分区结果综合考虑获得最终的均质区。将此法应用到钻孔裂隙岩体中,并验证了结果的正确性。

The zoning of structural homogeneity of rock mass is carried out according to the project features. In practice, we must choose the elements which have great influence on the project to be used as the basis of zoning. In view of the problem about the permeability characteristics of fractured rock mass, the zoning method for structural homogeneity, with combines the density partition method with the occurrence partition method, is put forward. The density partition method divides the absolute difference of density using the method of overlapping windows. The occurrence partition method first revises the deviation of actual frequencies of samples in contingency table and then uses the revised data to conduct independence tests to determine the homogeneous zones in the fractured rock mass. Based on the mathematical principles, the final homogeneous zones can be obtained through comprehensive consideration of the results of the above two kinds of partition methods. The propose method is applied the to drilling fractured rock mass, and the validity of its results is verified.