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Geostatistical modeling of Rock Quality Designation (RQD) and geotechnical zoning accounting for directional dependence and scale effect
Engineering Geology ( IF 7.4 ) Pub Date : 2021-08-19 , DOI: 10.1016/j.enggeo.2021.106338
L. Katherine Sánchez , Xavier Emery , Serge A. Séguret

The characterization of rock masses is an essential component for the planning and development of engineering designs in rock mechanics and rock engineering. The Rock Quality Designation (RQD) is a widely used rock mass characterization system that is direction-dependent, i.e., the measurement of a core sample depends not only on the sample position but also on its orientation. This paper outlines the critical aspects of the determination of RQD and proposes a physically-based upscaling strategy from borehole samples to large blocks, based on block-averaging the RQD values corresponding to the same direction, then calculating the minimum value over all the directions. An anisotropy index indicating how much RQD varies between one direction and another is also derived. Using geostatistical simulation, our proposal allows interpolating and upscaling direction-dependent geotechnical variables like RQD at any place in the geographical space for any direction, avoiding directional biases. We illustrate this proposal by predicting RQD in a polymetallic deposit, achieving geotechnical zoning and comparing the results with those of the traditional approach where the directional dependence of RQD is ignored.



中文翻译:

岩石质量标志 (RQD) 的地质统计建模和考虑方向依赖性和尺度效应的岩土分区

岩体表征是岩石力学和岩石工程中工程设计规划和开发的重要组成部分。岩石质量指定 (RQD) 是一种广泛使用的岩体表征系统,它与方向有关,即岩心样本的测量不仅取决于样本位置,还取决于其方向。本文概述了确定 RQD 的关键方面,并提出了一种从钻孔样本到大块的基于物理的放大策略,基于块平均对应于同一方向的 RQD 值,然后计算所有方向的最小值。还导出了指示 RQD 在一个方向和另一个方向之间变化多少的各向异性指数。使用地质统计模拟,我们的提议允许在地理空间的任何位置为任何方向插入和放大与方向相关的岩土变量,如 RQD,避免方向偏差。我们通过预测多金属矿床的 RQD、实现岩土分区并将结果与​​忽略 RQD 方向依赖性的传统方法的结果进行比较来说明这一建议。

更新日期:2021-08-19
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