Abstract
Based on the interface shear tests, the macro- and meso-mechanical behaviors of interaction between coral sand and different structure surfaces are studied, in which CCD camera is used to capture digital images to analyze the evolution of the interaction band and a particle analysis apparatus is applied to studying the distribution characteristics of particle morphology. This study proposes four-stage evolution process based on the shear stress-strain curve. During the shear process, coral sand particles slide and rotate within the interaction band, causing the changes in shear stress and vertical displacement. In addition, the effects of structure surface roughness on shear strength, volume change and particle breakage are illustrated that the greater the roughness of slabs is, the larger the shear stress is, the more obvious the contraction effect is and the more the particles break. Furthermore, the change in particle’s 3D morphology during the breakage will change not only their size but also other morphological characteristics with convergence and self-organization.
摘要
基于接触面剪切试验, 本文研究了珊瑚砂与不同结构面间相互作用的宏观和细观力学行为。试 验中采用CCD 相机捕获数字图像以分析接触带的演化, 同时应用粒子分析仪研究试验前后颗粒形态 分布特征。基于剪切应力−应变曲线, 本研究提出了剪切过程中的四个演化阶段。在剪切过程中, 试 样剪切应力和垂直位移的变化是由于珊瑚砂在接触带内发生滑动和旋转而产生的; 此外,, 结构表面粗 糙度对剪切强度, 体积变化及颗粒破碎的影响结果表明, 结构面的粗糙度越大, 峰值剪应力越高, 体 积收缩效越明显, 颗粒破碎越显著。在破裂过程中,, 颗粒三维特征不仅发生尺寸变化, 同时颗粒形态 也表现为均一化和自组织变化。
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FENG Ze-kang conducted series of tests, wrote the manuscript and analyzed the results. XU Wen-jie designed tests and also provided writing assistant for the manuscript. MENG Qing-shan gave suggestions about the experiment, and edited the manuscript.
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Project(2017YFC0805406) supported by the National Key Research and Development Program of China; Projects (51879142, 51679123) supported by the National Natural Science Foundation of China; Project(2020-KY-04) supported by the Research Fund Program of the State Key Laboratory of Hydroscience and Engineering, China
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Feng, Zk., Xu, Wj. & Meng, Qs. Mechanical behaviors of interaction between coral sand and structure surface. J. Cent. South Univ. 27, 3436–3449 (2020). https://doi.org/10.1007/s11771-020-4557-x
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DOI: https://doi.org/10.1007/s11771-020-4557-x