Simplified Method for Estimating the Hoek-Brown Constant for Intact Rocks
Simplified Method for Estimating the Hoek-Brown Constant for Intact Rocks
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DOI：
10.1061/(asce)gt.1943-5606.0001116
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发表时间：
2014-03
影响因子：
3.9
通讯作者：
Jiayi Shen;M. Karakus
中科院分区：
文献类型：
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作者：
Jiayi Shen;M. Karakus
摘要 常数 mi 是 Hoek-Brown (HB) 准则估计岩石材料强度所需的基本参数。为了计算mi值，需要进行三轴试验；然而，三轴测试既耗时又昂贵。在这项研究中，提出了一种简化方法，可以使用岩石类型和完整岩石的单轴抗压强度（UCS）信息来估计 mi 值。为了评估所提出方法的可靠性，在 HB 准则中使用所提出方法估计的 mi 值来预测完整岩石强度。然后使用作者实验室中现有的三轴试验和测试，对预测的完整岩石强度与实验完整岩石强度进行测试。比较结果表明，在没有三轴试验数据的情况下，根据该方法计算的 mi 值可以可靠地用于 HB 准则中估算完整岩石强度。
AbstractThe constant mi is a fundamental parameter required for the Hoek-Brown (HB) criterion to estimate the strength of rock materials. To calculate mi values, triaxial tests need to be carried out; however, triaxial tests are time-consuming and expensive. In this research, a simplified method is proposed that can estimate mi values using information on rock types and the uniaxial compressive strength (UCS) of intact rocks. To evaluate the reliability of the proposed method, mi values estimated from the proposed method are used in the HB criterion to predict intact rock strength. The predicted intact rock strength is then tested against experimental intact rock strength using existing triaxial tests and tests in the authors’ laboratory. Results from the comparison show that mi values calculated from the proposed method can be used reliably in the HB criterion for estimating intact rock strength when triaxial test data are not available.