| 钙质砂一维蠕变分形破碎特性宏微观试验研究 |
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| 引用本文： | 陈宾,邓坚,胡杰铭,张建林,张涛.钙质砂一维蠕变分形破碎特性宏微观试验研究[J].岩土力学,2022,43(7):1781-1790. |
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| 作者姓名： | 陈宾 邓坚 胡杰铭 张建林 张涛 |
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| 作者单位： | 1. 湘潭大学 土木工程与力学学院，湖南 湘潭 411105；2. 湘潭大学 岩土力学与工程安全湖南省重点实验室，湖南 湘潭 411105；
3. 河海大学 力学与材料学院，江苏 南京 210098 |
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| 基金项目： | 国家自然科学基金项目(No.51774131,No.41972282)~~； |
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| 摘 要： | 钙质砂是远洋地区港口、机场和民用建筑等构筑物的天然地基材料。通过钙质砂一维压缩蠕变试验和微观结构测试，发现了蠕变前后表面孔隙面积减小且呈分散分布的规律以及试验过程中试样瞬时变形、快速变形和衰减变形特征与粒径的高度相关性；利用基于分形理论改进的相对颗粒破碎率和质量分形维数描述了蠕变前后颗粒破碎程度，得到了分形维数和蠕变与时间的衰减形态曲线关系以及宏观质量分形维数和微观表面分形维数的线性关系，并在此基础上对单一粒径组钙质砂蠕变过程中的分形破碎行为进行了多尺度分析和宏微观跨尺度关联性研究，获得了蠕变过程中颗粒破碎发展以及微观孔隙变化规律，证明了钙质砂蠕变过程中的颗粒重组排列、破碎和研磨行为，揭示了钙质砂蠕变机制。
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| 关 键 词： | 钙质砂 蠕变 颗粒破碎 宏微观研究 蠕变机制 |
| 收稿时间： | 2021-10-12 |
| 修稿时间： | 2022-03-28 |
Macroscopic and microscopic experimental study on fractal fragmentation characteristics of calcareous sand during one-dimensional compression creep |
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| CHEN Bin,DENG Jian,HU Jie-ming,ZHANG Jian-lin,ZHANG Tao.Macroscopic and microscopic experimental study on fractal fragmentation characteristics of calcareous sand during one-dimensional compression creep[J].Rock and Soil Mechanics,2022,43(7):1781-1790. |
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| Authors: | CHEN Bin DENG Jian HU Jie-ming ZHANG Jian-lin ZHANG Tao |
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| Institution: | 1. College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan, Hunan 411105, China;
2. Hunan Provincial Key Laboratory of Geomechanics and Engineering Safety, Xiangtan University, Xiangtan , Hunan 411105, China;
3. College of Mechanics and Materials, Hohai University, Nanjing, Jiangsu 210098, China |
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| Abstract: | Calcareous sand is a natural foundation material for ports, airports and some civil buildings in ocean areas. Through the one-dimensional compression creep test of calcareous sand and the analysis of its micro-structure, it was found that the surface pore area decreased after creep and showed a dispersed distribution. In addition, the characteristics of instantaneous deformation, rapid deformation and attenuation deformation of the sample during the test were highly correlated with the particle size. The relative particle breakage rate and mass fractal dimension improved based on fractal theory were used to describe the degree of particle breakage after creep. The relationship between the decay of fractal dimension and creep with time, as well as the linear relationship between the fractal dimension of macroscopic mass and the fractal dimension of microscopic surface was obtained. On this basis, the fractal fracture behavior of calcareous sand with a single particle size group during long-term creep was analyzed at multiple scales, and the corresponding macro and micro cross-scale correlation was studied. The development of particle breakage and the variation of microscopic pores during creep were obtained. This study proved the rearrangement, crushing and grinding behavior of calcareous sand particles in the creep process, and revealed the creep mechanism of calcareous sand. |
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| Keywords: | calcareous sand creep particle breakage macro-micro analysis creep mechanism |
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