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首页> 外文期刊>International Journal of Rock Mechanics and Mining Sciences >A new general empirical approach for the prediction of rock mass strengths of soft to hard rock masses
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A new general empirical approach for the prediction of rock mass strengths of soft to hard rock masses

机译：预测软硬岩体强度的一种新的一般经验方法

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It is almost impossible to prepare representative cores of rock masses including discontinuities patterns for laboratory studies. To overcome these difficulties, researchers have focused on developing empirical equations for estimating of the stress-strain behavior of a rock mass, including measurements of the discontinuity patterns. As can be seen in the literature, the uniaxial compressive strength value of rock mass (UCS_(RM)) can be estimated by reducing the uniaxial compressive strength of intact rock material (USC_i) based on the quality of a rock mass, represented by variables such as Rock Mass Rating (RMR), Geological Strength Index (GSI) and Q value. For this reason, a unique reducing curve form empirical equation has limited application and generally, cannot be applied to all kind of rock masses from particularly soft to hard rock masses. In this study, a new general empirical approach is constructed to estimate the strength of rock masses of varying hardness. The new empirical equations have been calibrated using data from five slope failures and four sets of uniaxial compressive strength data of rock masses. In the new empirical equations, the UCS_i is considered not only to be a scale parameter used in the strength reduction but also used to adjust the degree of strength reduction in conjunction with elastic modulus of the rock material (E_i). The disturbance factor on the rock mass is taken into consideration by two separate reduction factors applied to the Structure Rating (SR) to capture increasing joint density, and to the s and m_b parameters of the Hoek-Brown criterion, to decrease the degree of interlocking. Hence, non-interlocked (cohesionless under zero normal stress) rock masses such as spoil piles can also be modeled in the new empirical approach.
机译：几乎没有可能准备出具有代表性的岩心，包括用于实验室研究的不连续性模式。为了克服这些困难，研究人员致力于开发经验方程式，以估算岩体的应力-应变行为，包括对不连续性模式的测量。从文献中可以看出，岩体的单轴抗压强度值（UCS_（RM））可以通过根据岩体的质量降低完整岩石材料（USC_i）的单轴抗压强度来估算，用变量表示例如岩石质量等级（RMR），地质强度指数（GSI）和Q值。因此，独特的折减曲线形式的经验方程式具有有限的应用，并且通常不能应用于从特别软到硬的岩体的所有类型的岩体。在这项研究中，构建了一种新的一般经验方法来估计不同硬度的岩体的强度。新的经验方程式已使用来自五个边坡破坏的数据和四组岩体的单轴抗压强度数据进行了校准。在新的经验公式中，UCS_i不仅被视为用于强度折减的比例参数，而且还被用来与岩石材料的弹性模量（E_i）一起调整强度折减的程度。岩石质量的扰动因子是通过两个单独的减小因子来考虑的，这些减小因子应用于结构等级（SR）以捕获不断增加的节理密度，并应用于Hoek-Brown准则的s和m_b参数以减小互锁程度。因此，也可以在新的经验方法中模拟非互锁（零法向应力下无粘性）的岩体，如弃土桩。

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