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首页> 外文期刊>Tunnelling and underground space technology >Quantitative assessments of the correlations between rock mass rating (RMR) and geological strength index (GSI)
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Quantitative assessments of the correlations between rock mass rating (RMR) and geological strength index (GSI)

机译：岩石质量评级（RMR）与地质强度指数（GSI）之间的相关性的定量评估

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摘要

Among various engineering classification systems, RMR and GSI are two of the most widely used rock mass classification systems. Correlation between RMR and GSI can provide an alternative approach to determine one from the other. Based on the latest improved RMR, known as RMR14, the quantitative assessments of the correlations between RMR and GSI is conducted systematically based on the studies on the correlations of basic classified indices, which are mainly related to the structural conditions of rock mass. 260 groups of field investigating results obtained directly from the tunnel excavation faces of six new construction tunnels are collected to assess the quantitative correlations of the basic classified indices for the rock mass integrity condition and the surface condition of discontinuities, respectively. Monte Carlo simulation method is employed to generate sufficient samples based on the statistical characteristics of the collected 260 group results, and a simplified quantitative correlation between RMR and GSI is proposed statistically. Then, an expression merely related to the uniaxial compressive strength of rock is derived to reflect the basic classified indices for the strength and alterability of intact rock. A comprehensive quantitative correlation combined with the intact rock properties is suggested. Finally, the two proposed quantitative correlations between RMR and GSI are applied to evaluate 36 sites of the surrounding rock mass of Suocaopo Tunnel in Guizhou Province, China. The validated results show that the proposed simplified quantitative correlation shows a rather good performance to reflect the correlation of RMR and GSI. Moreover, the comprehensive quantitative correlation is more accurate because that the intact rock properties are considered merely with the uniaxial compressive strength.
机译：在各种工程分类系统中，RMR和GSI是最广泛使用的两种岩体分类系统。 RMR和GSI之间的相关性可以提供另一种方法来彼此确定。基于最新改进的RMR（称为RMR14），在对基本分类指标的相关性进行研究的基础上，系统地对RMR和GSI之间的相关性进行了定量评估，这些基本分类指标主要与岩体的结构条件有关。收集了直接从6条新建隧道的隧道开挖面获得的260组现场调查结果，以分别评估岩体完整性条件和不连续面条件的基本分类指标的定量相关性。基于蒙特卡罗模拟方法，基于所收集的260个组结果的统计特征，生成足够的样本，并从统计学角度提出了简化的RMR和GSI定量相关性。然后，导出仅与岩石的单轴抗压强度有关的表达式，以反映完整岩石的强度和易变性的基本分类指标。提出了与完整岩石特性相结合的综合定量相关性。最后，将RMR和GSI之间的两个定量关系式用于评估贵州省索草坡隧道的36个围岩位置。验证的结果表明，所提出的简化的定量相关性在反映RMR和GSI的相关性方面表现出相当好的性能。而且，由于仅考虑单轴抗压强度来考虑完整的岩石特性，因此综合的定量相关性更为精确。

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