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| Application of improved Miller method in the division of statistical homogenous zones of fractured rock mass |
| ZHANG Yue1，LI Xiaozhao1，2，XU Wentao1，ZHANG Yangsong3，YU Xingjian1，LIU Richeng2 |
(1. School of Earth Sciences and Engineering，Nanjing University，Nanjing，Jiangsu 210023，China；2. Key Laboratory of Deep Geomechanics and Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；
3. Department of Civil Engineering，Nanjing University of Science and Technology，Nanjing，Jiangsu 210094，China) |
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Abstract Fractured rock mass statistical homogeneous area division is the basis for evaluating quality and stability of rock mass and modeling. The rock mass homogenous area division methods based on Miller method are limited by sample size，degree of freedom and Lancaster rules. In this paper，Miller method was optimized from three levels including block network division scheme，overall significance level value and principle of merging blank areas. Some typical outcrops in the preselected site of a nuclear waste repository in Beishan，Gansu province，were selected as the research objects，and the rock mass statistical homogeneous area was comprehensively analyzed and evaluated combined with the Mathab method and the Pearson correlation coefficient method. The results show that the optimized Miller method is more adaptable than the original method for the coexistence of steep and gentle dips in the Beishan area，that the division results of the Mathab method fluctuate greatly and have lower credibility，and that Pearson¢s correlation coefficient method is not strong in identifying correlation in statistical significance. The improved Miller method is more applicable to the division of fractured rock mass homogeneous area under complex conditions.
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2021, Vol. 40 
