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针对岩质高边坡的稳定性分析问题,开展了基于广义Hoek-Brown破坏准则强度折减法的研究。提出了判别强度折减法合理性的两个基本标准:与Mohr-Coulomb准则强度折减法的一致性和能否体现节理岩体的真实破坏特征。基于以上标准,对比了3种不同的基于广义Hoek-Brown破坏准则的强度折减方法:σci、mi,σci、GSI和mi、GSI均同比折减,理论分析表明:mi、GSI同比折减更符合前述标准。最后,通过对工程实例的对比研究,验证了这一结论,并提出mi、GSI同比折减更能体现节理岩体的真实破坏特征,因而其安全系数的计算结果也更加真实可靠。
Aiming at the stability analysis of rocky high slope, the study on the strength reduction method based on the generalized Hoek-Brown failure criterion is carried out. Two basic criteria for judging rationality of strength reduction method are put forward: consistency with Mohr-Coulomb criterion strength reduction method and whether it can reflect the true failure characteristics of jointed rock mass. Based on the above criteria, three different strength reduction methods based on the generalized Hoek-Brown failure criterion are compared: σci, mi, σci, GSI and mi, and GSI all decrease year on year. Theoretical analysis shows that mi and GSI decrease year on year Meet the above criteria. Finally, through the comparative study of engineering examples, this conclusion is validated. It is also pointed out that the mi and GSI year-on-year reductions can reflect the true failure characteristics of the jointed rock mass. Therefore, the calculation of the safety factor is more realistic and reliable.