Effect of gradation on macro-meso shear properties of the alluvial-diluvial soil-rock mixture (ADSRM)

IF 2.6 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Longqi Liu, Zhenhao Fan, Linhu Yao, Yunshu Yang
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Abstract

Alluvial-diluvial soil-rock mixture (ADSRM) is a unique geological material primarily consisting of pebbles, gravel, and soil. Gradation design significantly enhances the shear strength of ADSRM, offering significant implications for sustainable construction of transportation infrastructure in mountainous regions. Hence, the N-method of gradation theory was employed for the gradation design of ADSRM fillers in this study. Macro-mechanical testing reveals that the graded sample exhibits significantly higher shear strength, equivalent cohesion, and friction angle compared to the ungraded sample, with more pronounced shear dilatancy. Meso-shear properties suggest that the graded sample has a lower percentage of pore area compared to the ungraded sample, but a higher percentage of small pores relative to total pores, and more crushed rock blocks under the same normal stress conditions. Pore abundance indicates that the majority of pores on the shear plane are oblate in shape. The findings from the equivalent diameter and fractal dimension of the rock block contour suggest improved grinding roundness of rock blocks in the graded sample post-shearing. In summary, the quantity of pores and broken rock blocks primarily impacts the strength and equivalent cohesion of the filler, while the abundance, roundness, shape coefficient, and fractal dimension of rock block contour mainly affects the internal friction angle.
分级对冲积-冲积土岩混合物(ADSRM)宏观介质剪切特性的影响
冲积-冲积土岩混合物(ADSRM)是一种独特的地质材料,主要由卵石、砾石和土壤组成。级配设计可大大提高 ADSRM 的抗剪强度,对山区交通基础设施的可持续建设具有重要意义。因此,本研究采用 N 级配理论方法对 ADSRM 填料进行级配设计。宏观力学测试表明,与未分级样品相比,分级样品的剪切强度、等效内聚力和摩擦角明显更高,剪切扩张性更明显。介观剪切特性表明,与未分级样本相比,分级样本的孔隙面积百分比较低,但小孔隙占总孔隙的百分比较高,在相同的法向应力条件下,破碎岩块更多。孔隙丰度表明,剪切面上的大部分孔隙呈扁圆形。岩块轮廓的等效直径和分形尺寸的研究结果表明,剪切后分级样本中岩块的磨圆度有所提高。总之,孔隙和破碎岩块的数量主要影响填料的强度和等效内聚力,而岩块轮廓的丰度、圆度、形状系数和分形尺寸则主要影响内摩擦角。
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来源期刊
Frontiers in Materials
Frontiers in Materials Materials Science-Materials Science (miscellaneous)
CiteScore
4.80
自引率
6.20%
发文量
749
审稿时长
12 weeks
期刊介绍: Frontiers in Materials is a high visibility journal publishing rigorously peer-reviewed research across the entire breadth of materials science and engineering. This interdisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers across academia and industry, and the public worldwide. Founded upon a research community driven approach, this Journal provides a balanced and comprehensive offering of Specialty Sections, each of which has a dedicated Editorial Board of leading experts in the respective field.
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