Ground failures in a slope due to gravity, are commonly known as landslides. Depend on the compositional, geological, and structural characteristics of the unstable initiation zone and the erosional composition of the propagation zone decide the complete particle size distribution of the moving mass and its gradation. This information is most important for the study of downslope movement. Only laboratory sieve analysis cannot fulfil this target because the natural debris contains a wide range of particle sizes, especially boulders. The combined method of scaled image analysis and laboratory sieve analysis or the combined method of line-grid analysis and laboratory sieve analysis was proposed to fulfil the requirement. To study the proposed combined methods, five different locations within the downslope propagation zone from the Aranayake landslide in Sri Lanka were surveyed and analyzed. In image analysis, the high-resolution scaled image of deposited debris was analyzed by computer-based image analysis for particle sizes. Small particles were addressed by the laboratory sieve analysis using the representative debris sample taken from the same location. If the boulder sizes within the debris are too big to address this method, then the Line-grid method was performed. The particles in every 0.5 m along a measured line of debris deposition were measured in this method. If the selected location contains small particles that cannot measured manually, the representative sample was used for the laboratory sieve analysis to fulfil this range. The results of three locations indicated a 40% distribution of < 10 mm and a 60% distribution of > 10 mm representing the general distribution of the debris. Two distributions deviated from the general distribution that was surveyed and analyzed from special locations of the “near boundary of flow path” and “slope change zone” of the landslide. The combined methodology yielded successful results of complete particle size distribution for the wide range of particle sizes in debris. The variation of the particle size distribution curves of debris along the downslope depositions is planned to be used for the study of downslope propagation, damage zone assessment studies, and predicting the representative composition of future failures.

中文翻译：

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缩放图像分析、线网格分析和实验室筛分分析相结合的方法识别滑坡残骸的完整粒度分布

由于重力导致的斜坡地面破坏通常称为山体滑坡。不稳定起始区的成分、地质和结构特征以及扩展区的侵蚀成分决定了运动物质的完整粒度分布及其级配。该信息对于下坡运动的研究最为重要。仅实验室筛分分析无法实现这一目标，因为天然碎片包含各种粒径，尤其是巨石。为满足这一要求，提出了缩放图像分析与实验室筛分分析相结合或线网格分析与实验室筛分分析相结合的方法。为了研究所提出的组合方法，对斯里兰卡阿拉纳亚克滑坡下坡传播区内的五个不同位置进行了调查和分析。在图像分析中，通过基于计算机的颗粒尺寸图像分析来分析沉积碎片的高分辨率缩放图像。使用从同一位置采集的代表性碎片样本进行实验室筛分分析来解决小颗粒问题。如果碎片内的巨石尺寸太大而无法解决此方法，则执行线网格方法。该方法测量了沿着碎片沉积测量线每0.5 m的颗粒。如果所选位置包含无法手动测量的小颗粒，则使用代表性样品进行实验室筛分分析以满足此范围。三个位置的结果表明，40% 的分布小于 10 毫米，60% 的分布大于 10 毫米，这代表了碎片的总体分布。两次分布偏离了滑坡“流道近边界”和“坡变区”特殊位置调查分析的总体分布。该组合方法成功地获得了碎片中各种粒径的完整粒径分布结果。沿下坡沉积的碎片粒径分布曲线的变化计划用于下坡传播研究、损伤区域评估研究以及预测未来故障的代表性组成。