Hoek-Brown准则下岩质边坡的GSI反演

Back analysis of rock slope GSI magnitude under Hoek-Brown criterion

利用极限分析上限定理,基于Hoek-Brown准则,求出边坡的临界滑动面的方程。并研究Hoek-Brown各参数的性质,将岩体地质强度指标(GSI)作为反演对象。通过研究,分析GSI与潜在滑动面深度的关系,绘制不同坡率下滑动面深度随重度γ及边坡高度H的变化规律。研究结果表明:对于岩质边坡,可以各位置的滑动面深度对GSI进行反演。最后,通过算例证明利用本文方法获得GSI反演值与既有结果符合较好,证明了本文方法的可靠性。

For slope in closely jointed schist rock mass, the equation of the slid surface was solved by the limit analysis upper bound theorem under Hoek-Brown criterion. The relationship between GSI and the slid surface depth was analyzed and the change law of slid surface with y and H was plotted. The results show that the GSI can be back analyzed utilizing the slid surface depth. Finally, a example proves the effectiveness of this method.