Hoek-Brown强度准则研究进展及岩体力学参数取值

Research Progress of Hoek-Brown Strength Criterion and Determination of Mechanical Parameters of Rock Mass

岩体力学参数取值是工程建设过程中的关键环节之一,取值方法及结果的合理性对围岩稳定性研究及支护设计至关重要。文章以Hoek-Brown强度准则为基础,系统性地讨论了该方法和取值结果的基本特点,及其与规程规范经验取值方法的差异和根源。概括地,基于Hoek-Brown强度准则的岩体力学参数取值方法综合考察了岩性、围岩质量、围岩应力这三个关键性地质因素的影响,与规范方法相比,更为全面地考虑了地质因素的多样性及其导致力学参数取值的差异性。深埋岩体工程实践表明,这一取值方法比传统M-C强度理论和建立在该理论基础上的规范取值方法相对合理。

The determination of mechanical parameters of rock mass is one of the key links during engineering con⁃struction,the rationality of the method and result is of great importance for the study of surrounding rock stability and support design.Based on the Hoek-Brown strength criterion,the characteristics of this method and determina⁃tion results as well as the differences from that of empirical method stipulated in standard and the inherent sources are discussed systematically.In general terms,the Hoek-Brown strength criterion based determination method for mechanical parameters comprehensively considers the effects of three key geological factors of lithology,rock quali⁃ty and stress.Compared with the method stipulated in standard,this method fully considers the diversities of geologi⁃cal factors and the differences of determined mechanical parameters.The engineering practice in deep-buried rock mass shows this method is relatively reasonable compared with the conventional M-C strength theory and the speci⁃fied parameter determination method based on it.