Slope Failure in a Foliated Rock Mass with Non-Uniform Joint Spacing: a Comparison Between Numerical and Centrifuge Model Results
Slope Failure in a Foliated Rock Mass with Non-Uniform Joint Spacing: a Comparison Between Numerical and Centrifuge Model Results
复制标题
DOI：
10.1007/s00603-014-0553-5
复制
发表时间：
2014
影响因子：
6.2
通讯作者：
S. Pant;D. Adhikary;A. Dyskin
中科院分区：
文献类型：
--
作者：
S. Pant;D. Adhikary;A. Dyskin
弯曲倾倒是一种边坡破坏模式，涉及由一组或多或少平行于边坡并向岩体倾斜的不连续面形成的相互作用的岩柱的倾覆。在分析中，岩柱可以被看作是一组悬臂梁，它们在自身重量的作用下弯曲，并将荷载传递给下面的岩石。当诱导拉应力超过趾区岩层的抗拉强度时，该区域开始发生层裂，并可能导致边坡的递进破坏。早期对片理岩质边坡弯曲倾倒破坏的研究（如Aydan and Kawamoto 1992； Adhikary et al. 1996, 1997）只考虑了均匀节理间距。然而，在自然地质条件下，节理间距高度不均匀。本文研究了节理摩擦角较低情况下，非均匀节理间距片理边坡的弯曲倾倒问题。用离心分离机对硅玻璃薄板制作的小尺度叶状边坡模型进行了两次试验，并与有限元模拟结果进行了比较。
Flexural toppling is a mode of slope failure involving the overturning of interacting rock columns formed by a single set of discontinuities which strike more or less parallel to the slope and dip into the rock mass. In the analysis, the rock columns may be visualised as an array of cantilever beams, which bends under its own weight and transfers load to the underlying rock. When the induced tensile stress exceeds the tensile strength of the rock layer in the toe region, layer fracturing starts in this region and may lead to a progressive slope failure. Earlier investigations of the flexural toppling failure of foliated rock slopes (eg Aydan and Kawamoto 1992; Adhikary et al. 1996, 1997) have considered only a uniform joint spacing. However, in natural geological conditions, joint spacing is highly non-uniform. This paper investigated the flexural toppling of foliated rock slopes with non-uniform joint spacing for the case of low joint friction angle. The results of two centrifuge tests conducted on small-scale foliated slope models manufactured from silica glass sheets have been compared with the results obtained from the finite element simulations.