| 珊瑚颗粒孔隙结构及渗流特性分析 |
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| 引用本文： | 马登辉,韩迅,关云飞,唐译.珊瑚颗粒孔隙结构及渗流特性分析[J].岩土力学,2022,43(Z2):223-230. |
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| 作者姓名： | 马登辉 韩迅 关云飞 唐译 |
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| 作者单位： | 1. 南京水利科学研究院 岩土工程研究所，江苏 南京 210024；2. 河海大学 土木与交通学院，江苏 南京 211100 |
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| 基金项目： | 国家重点研发计划（No.2021YFB2600700）；南京水利科学研究院院基金项目（No.Y319006，No.Y321008，No.Y320010）；国家自然科学基金青年基金项目（No.51909171）。 |
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| 摘 要： | 珊瑚砂的孔隙结构对珊瑚砂的力学性质和渗透特性影响显著，采用高分辨率计算机断层扫描仪（computed tomography，简称CT）对珊瑚砂颗粒进行了扫描，建立了珊瑚砂颗粒的三维孔隙结构模型，并对孔隙的直径、体积、紧密度、球度进行了定量分析，采用数值模拟方法探究了松散堆积珊瑚砂及单颗粒珊瑚砂内孔隙结构的渗透特性。试验结果表明：孔隙数量随着孔隙直径的增加显著减少，且微孔数量较多，大孔数量较少；孔隙的直径与紧密度之间为幂函数关系，与球度之间则表现为线性关系。渗流分析结果显示，松散堆积珊瑚砂的渗透能力显示出各向异性，Z方向的绝对渗透率小于X、Y方向。珊瑚砂颗粒内的孔隙渗流速度较慢，不同颗粒之间渗流能力差距较大，部分颗粒不能发生渗流，且颗粒内孔隙的绝对渗透率仅占总绝对渗透率的1.26%。
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| 关 键 词： | 珊瑚砂 CT 孔隙结构 渗流 三维重构 |
| 收稿时间： | 2021-06-11 |
| 修稿时间： | 2022-03-30 |
Pore structure and seepage characteristics analysis of coral sand particles |
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| MA Deng-hui,HAN Xun,GUAN Yun-fei,TANG Yi.Pore structure and seepage characteristics analysis of coral sand particles[J].Rock and Soil Mechanics,2022,43(Z2):223-230. |
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| Authors: | MA Deng-hui HAN Xun GUAN Yun-fei TANG Yi |
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| Institution: | 1. Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing, Jiangsu 210024, China;
2. College of Civil and Transportation, Hohai University, Nanjing, Jiangsu 211100, China |
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| Abstract: | Porous structure of coral sand
has a significant impact on its mechanical properties and permeability
characteristics. In this study, computed tomography (CT) was used to scan the
coral sand particles, and the three-dimensional pore structure model of the
coral sand particles was established in combination with image processing
technology. The diameter, volume, compactness, and sphericity of the pores were
quantitatively analyzed. Numerical simulation methods were used to examine the
permeability characteristics of the pore structure of loosely accumulated coral
sand and single-particle coral sand. Experimental results show that the number
of pores in the particles decreases significantly with the increase of the pore
diameter, which is characterized by a large number of micropores and a small
number of macropores. There is a power function relationship between the
diameter of the pores and the tightness, and a linear relationship with the
sphericity. Seepage analysis results show that the seepage capacity in the Z direction is significantly less than
the seepage capacities in the X and Y directions, and the seepage capacity
shows anisotropy. Porous seepage velocity in the inner pore of coral sand
particles is slow, the seepage capacity gap between different particles is
large. In addition, no seepage occurs in some particles, and the absolute permeability
of the pores in the particles only accounts for 1.26% of the total absolute
permeability. |
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| Keywords: | coral sand CT pore structure seepage 3D reconstruction |
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