岩石块体三维网格半自动圈定方法及工程应用

Regine Tsui, Jonathan Hart, W. Hou, Alan Ng
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引用次数: 0

摘要

岩石块体三维模型的自动识别是岩石工程研究的一种有用的新工具。当与岩石工程专业人员一起进行时,它具有远程描绘与不利不连续面相关的潜在不稳定岩块的潜力。提出了一种不需要预先提取和拟合不连续平面的三维网格半自动圈定岩块的方法。所提出的方法从痕迹提取开始,利用两个岩石块之间的接触最常通过岩石表面上的痕迹(即暴露线)来表现的事实。几何上,轨迹通常是凹边或凹线。这些痕迹首先被提取,因为它们的凹度或暗度比邻近的网格面高。经过后处理后,网格在提取的轨迹线周围被分割成子网格。算法在Python中实现,并在三个岩质边坡上进行了测试,包括:(1)美国Ouray的岩质边坡;(2)香港马石洲的天然岩石露头;(3)在香港一项大规模地盘发展计划中,现正重建的前采石场内的岩石斜坡。该方法可以丰富岩石填图结果,并有助于识别可能存在平面破坏风险的临界岩块。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An Alternative Approach for Semi-Automatic Delineation of Rock Blocks on 3D Meshes and Engineering Application
Auto-identification of rock blocks on 3D models is a useful new tool for rock engineering. It has the potential, when undertaken with rock engineering professionals, to delineate remotely, potentially unstable rock blocks associated with adverse discontinuities. An alternative approach is proposed to semi-automatically delineate rock blocks on 3D meshes, which does not require prior extraction and fitting of discontinuity planes. The proposed approach starts with trace extraction, exploiting the fact that the contact between two rock blocks is most often manifested by a trace (i.e., an exposed line) on the rock surface. Geometrically, the trace is usually either a concave edge or a depressed line. These traces are first extracted due to their higher concavity or darkness compared to their neighbouring mesh faces. After post-processing, the mesh is segmented into sub-meshes around the extracted trace lines. The algorithms are implemented in Python and are tested on three rock slopes, including: (1) a rock slope in Ouray, USA; (2) a natural rock outcrop in Ma Shi Chau, Hong Kong; and (3) a rock slope in a former quarry currently being redeveloped as part of a large-scale site development in Hong Kong. Our approach can enrich the rock mapping results and help identify critical rock blocks which may be at risk of planar failure.
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