Three-dimensional stability assessment of slopes in intact rock governed by the Hoek-Brown failure criterion
Three-dimensional stability assessment of slopes in intact rock governed by the Hoek-Brown failure criterion
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DOI：
10.1016/j.ijrmms.2020.104522
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发表时间：
2021-01-18
影响因子：
7.2
通讯作者：
Michalowski, Radoslaw L.
中科院分区：
文献类型：
--
作者：
Park, Dowon;Michalowski, Radoslaw L.
边坡的三维破坏分析相当复杂，对于岩石边坡来说，其岩石强度由非线性破坏包络线定义，因此尤其复杂。这就是为什么许多早期方法在进行稳定性分析之前使用强度包络的线性近似。由于使用了 Hoek-Brown 失效准则的参数化形式，本文避免了这种近似。使用极限分析的运动学方法作为研究方法。提出了一个论点，即尽管岩石在低围应力下容易破裂，但在破坏过程中应力脆性下降之前的变形延展性可能足以适用极限分析定理。评估岩质边坡稳定性的两个指标：稳定数和安全系数。数值结果以图表和表格的形式呈现。由于所使用的极限分析允许人们评估真实解的严格界限，因此可以证明本文中使用的方法比主题文献中以前使用的方法产生更准确的结果。针对非常狭窄的岩石斜坡设计了一种新的、有效的破坏机制。
Three-dimensional failure analyses of slopes are rather elaborate, and for rock slopes, where the rock strength is defined by nonlinear failure envelopes, they are particularly intricate. This is why many earlier approaches used a linear approximation of the strength envelope prior to carrying out the stability analysis. This approximation is avoided in this paper, thanks to using the parametric form of the Hoek-Brown failure criterion. The kinematic approach of limit analysis is used as the method of study. An argument is brought forward that even though rocks tend to fracture at low confining stresses, the ductility of deformation prior to a brittle drop in stress during failure may be sufficient for limit analysis theorems to be applicable. Two measures of rock slope stability are evaluated: the stability number and the factor of safety. Numerical results are presented in the form of charts and tables. Because the limit analysis used allows one to evaluate the rigorous bounds on true solutions, it was possible to demonstrate that the method employed in the paper yields more accurate results than the approaches used formerly in the subject literature. A new and efficient mechanism of failure was devised for very narrow rock slopes.