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针对节理岩质边坡稳定性分析问题,开展了基于Hoek-Brown破坏准则的强度折减法研究。边坡的失稳过程是一个渐进累积破坏过程,破坏过程中各强度参数的衰减程度不同,在强度折减法中对应的折减系数也不同,不同折减系数间关系的确定及其综合安全系数的定义值得深入探讨。首先从岩体材料软化(硬化)特性出发,根据岩体强度参数从峰值强度到残余强度的变化规律,推导了Hoek-Brown破坏准则中3个强度参数折减系数间的数学关系式,然后以折减前后滑面上抗滑力之比定义综合安全系数来评价边坡的稳定性,最后结合算例验证了该方法的合理性,可有效应用于节理岩体边坡的稳定性分析。
According to the stability analysis of jointed rock slope, the study of strength reduction method based on Hoek-Brown failure criterion is carried out. The process of slope instability is a progressive cumulative failure process. The degree of attenuation of each intensity parameter is different during the failure process. The corresponding reduction coefficient in the strength reduction method is also different. The relationship between different reduction factors and its comprehensive safety factor The definition is worth exploring in depth. First of all, based on the softening (hardening) characteristics of rock mass materials, according to the variation law of rock mass strength parameters from peak strength to residual strength, the mathematical relation between the reduction coefficients of three strength parameters in Hoek-Brown failure criterion is deduced. The ratio of anti-skid force on the slip surface before and after reduction is defined as the comprehensive safety factor to evaluate the stability of the slope. Finally, an example is given to verify the rationality of the method, which can be effectively applied to the stability analysis of the jointed rock slope.