Influence of tensile strength on toppling failure in centrifuge tests
Influence of tensile strength on toppling failure in centrifuge tests
复制标题
DOI：
10.1016/j.ijrmms.2010.05.011
复制
发表时间：
2010-09
影响因子：
7.2
通讯作者：
A. Alzo’ubi;C. Martin;D. Cruden
中科院分区：
文献类型：
--
作者：
A. Alzo’ubi;C. Martin;D. Cruden
在岩石斜坡倾倒时，岩石薄片移出斜坡，最终形成破裂面。这种倾倒过程包括薄板之间的滑动和横跨薄板的拉伸断裂。采用基于离散单元框架的数值模拟方法，对倾倒边坡的离心模型试验进行了研究。该方法，其中包括在完整的岩石板的内部缺陷，是能够更准确地预测岩体内的破裂面比传统的离散元方法是可能的。此外，这种建模方法预测了实验研究中观察到的水平变形模式。为了加深对弯曲倾倒的理解，研究了抗拉强度对弯曲倾倒破坏的影响。拉伸强度被认为是一个关键因素，在这种破坏机制，和破坏载荷被认为是由拉伸强度控制。此外，完整岩石的摩擦角没有倾倒破坏机制的显着影响。
In toppling of rock slopes, thin slabs of rock displace out of the slope, eventually forming a rupture surface. This toppling process involves slip between the thin slabs and tensile rupture across the slabs. A numerical modelling methodology based on a discrete element framework was used to investigate centrifuge model tests of a toppling slope. The methodology, which includes internal flaws in the intact rock slabs, was able to predict the rupture surface inside the rock mass more accurately than is possible with the conventional discrete element method. Also, this modelling approach predicted the horizontal deformation patterns observed in the experimental study. The effect of tensile strength on the flexural toppling failures was investigated to further our understanding of the flexural toppling. The tensile strength was found to be a key factor in this failure mechanism, and the failure load was found to be controlled by the tensile strength. Moreover, the friction angle of the intact rock did not have a significant effect on the toppling failure mechanism.