Determination of joint roughness coefficient (JRC) for slope stability analysis: a case study from the Gold Coast area, Australia
Determination of joint roughness coefficient (JRC) for slope stability analysis: a case study from the Gold Coast area, Australia
复制标题
DOI：
10.1007/s10346-013-0410-8
复制
发表时间：
2013-05
期刊：
影响因子：
6.7
通讯作者：
D. H. Kim;I. Gratchev;A. Balasubramaniam
中科院分区：
文献类型：
--
作者：
D. H. Kim;I. Gratchev;A. Balasubramaniam
岩体结构面表面粗糙度是决定岩体强度特性的重要因素。节理粗糙度系数（JRC）是描述节理粗糙度的常用参数，通常采用巴顿梳法进行测量。然而，这种传统的测量方法可能相当主观，劳动密集和耗时。相比之下，摄影测量可以提供一种替代方法，以获得基于高分辨率3D模型的相对简单和快速的JRC测量。然而，这种测量的可靠性仍然是一个问题，因为摄影测量的结果可能会受到图像质量的影响。本研究旨在澄清摄影测量是否可以产生准确的测量JRC，可用于评估斜坡的稳定性。为此目的，在澳大利亚黄金海岸地区的岩石边坡与最近的楔形体破坏被选中，并采用三种不同的方法，如手动测量，摄影测量和倾斜试验，以确定JRC。所获得的结果表明，从这三种不同的测量中获得的JRC值存在一定的差异。特别是，使用巴顿梳获得的JRC值略高于通过摄影测量方法确定的值，而倾斜试验结果往往会产生高估的JRC值。采用通用离散元程序进行了计算分析，研究了JRC变化对边坡稳定性的影响。结果发现，JRC的增加导致斜坡的安全系数增加。
Surface roughness of rock discontinuities is an important factor that determines the strength characteristics of rock mass. Joint roughness coefficient (JRC), which is typically measured by means of Barton’s combs in the field, is widely used to describe the joint roughness. However, this traditional method of measurement can be rather subjective, labor-intensive and time consuming. In contrast, photogrammetry can provide an alternative method to obtain relatively simple and fast measurements of JRC based on high resolution 3D models. However, the reliability of such measurements still remains an issue as the results from photogrammetry can be affected by the quality of images. This study seeks to clarify whether photogrammetry can produce accurate measurements of JRC that can be used to assess the stability of slopes. A rock slope with a recent wedge failure in the Gold Coast area, Australia was selected for this purpose, and three different methods such as manual measurements, photogrammetry, and tilt tests were employed to determine the JRC. The obtained results showed some discrepancy in the values of JRC obtained from these three different measurements. In particular, the JRC obtained using the Barton’s comb had slightly higher values compared to those determined through the photogrammetry method while the tilt test results tended to yield overestimated values of JRC. Computer analysis using Universal Distinct Element Code was also performed to study the effect of JRC variation on the slope stability. It was found that an increase in the JRC led to an increase in the safety factor of the slope.